It's possible to step into the Java superclass?

[lobophf]

I did an experiment by setting a breakpoint at System.out.println line in ItelliJ. When I start a debug session and step into then, the IDE goes to the PrintStream.class

It's possible to do the same with Neovim? When I tried that, the message "Source not available, cannot jump to frame" appeared.
My log file shows:

~/.cache/nvim/dap.log

[ WARN ] 2022-11-19T10:24:44Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:894 ]	"No event handler for "	{
  body = {
    processId = 39447,
    shellProcessId = 0,
    type = "processid"
  },
  event = "processid",
  seq = 3,
  type = "event"
}

Here is my configuration:

~/.config/nvim/ftplugin/java.lua

local JAR_PATH =  os.getenv('HOME') .. '/.config/nvim/servers/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/plugins/org.eclipse.equinox.launcher_1.6.400.v20210924-0641.jar'
local CONFIG_PATH = os.getenv('HOME') .. '/.config/nvim/servers/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/config_linux'
local DEBUG_PATH = os.getenv('HOME') .. '/.config/nvim/debug/com.microsoft.java.debug.plugin/target/com.microsoft.java.debug.plugin-0.36.0.jar'
local DEBUG_TEST_PATH = os.getenv('HOME') ..'/.config/nvim/vscode-java-test/server/*.jar'


local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)
local WORKSPACE_DIR = vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h:t')

local util = require('jdtls.util')
local dap = require("dap")
require('jdtls').setup_dap({ hotcodereplace = 'auto' })
 
dap.adapters.java = function(callback)
  util.execute_command({ command = 'vscode.java.startDebugSession' }, function(err0, port)
  assert(not err0, vim.inspect(err0))
  callback({
    type = 'server',
    host = '127.0.0.1',
    port = port,
  })
  end)
end

-- Debugging
local bundles = {
  vim.fn.glob( DEBUG_PATH ),
}
vim.list_extend(bundles, vim.split(vim.fn.glob( DEBUG_TEST_PATH ), "\n"))

local config = {
  cmd = {
    'java',
    '-Declipse.application=org.eclipse.jdt.ls.core.id1',
    '-Dosgi.bundles.defaultStartLevel=4',
    '-Declipse.product=org.eclipse.jdt.ls.core.product',
    '-Dlog.protocol=true',
    '-Dlog.level=ALL',
    '-Xms1g',
    '--add-modules=ALL-SYSTEM',
    '--add-opens', 'java.base/java.util=ALL-UNNAMED',
    '--add-opens', 'java.base/java.lang=ALL-UNNAMED',
    '-jar', JAR_PATH,
    '-configuration', CONFIG_PATH,
    '-data', vim.fn.expand('~/.cache/nvim/workspaces_jdtls/') .. WORKSPACE_DIR 
  },
  root_dir = require('jdtls.setup').find_root({'.git', 'mvnw', 'gradlew'}),
  init_options = {
      bundles = bundles,
  },
  capabilities = capabilities,
  on_attach = function(client, bufnr) 
    require('jdtls.dap').setup_dap_main_class_configs()
  end
}

require('jdtls').start_or_attach(config)

[mfussenegger]

Yes that should work:

Can you try removing the dap.adapters.java definition? require('jdtls').setup_dap({ hotcodereplace = 'auto' }) already adds it with some extra functionality.

[lobophf]

Hi, thanks for your reply.

Your gif shows what I'm looking for, but unfortunately, your suggestion didn't work.

To try again, I did a fresh install only for the essential plugins. In addition, I built everything from the source (newest versions). The nvim-dap still has the same behavior, but the message "Source not available, cannot jump to frame" was gone.

Here is my new ~/.config/nvim/ftplugin/java.lua

local JAR_PATH =  os.getenv('HOME') .. '/.config/nvim/servers/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/plugins/org.eclipse.equinox.launcher_1.6.400.v20210924-0641.jar'
local CONFIG_PATH = os.getenv('HOME') .. '/.config/nvim/servers/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/config_linux'
local DEBUG_PATH = os.getenv('HOME') .. '/.config/nvim/servers/java-debug/com.microsoft.java.debug.plugin/target/com.microsoft.java.debug.plugin-0.42.0.jar'

local WORKSPACE_DIR = vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h:t')

-- Debugging
local bundles = {
  vim.fn.glob( DEBUG_PATH, 1 ),
}

local config = {
  cmd = {
    'java',
    '-Declipse.application=org.eclipse.jdt.ls.core.id1',
    '-Dosgi.bundles.defaultStartLevel=4',
    '-Declipse.product=org.eclipse.jdt.ls.core.product',
    '-Dlog.protocol=true',
    '-Dlog.level=ALL',
    '-Xms1g',
    '--add-modules=ALL-SYSTEM',
    '--add-opens', 'java.base/java.util=ALL-UNNAMED',
    '--add-opens', 'java.base/java.lang=ALL-UNNAMED',
    '-jar', JAR_PATH,
    '-configuration', CONFIG_PATH,
    '-data', vim.fn.expand('~/.cache/nvim/workspaces_jdtls/') .. WORKSPACE_DIR 
  },
  root_dir = require('jdtls.setup').find_root({'.git', 'mvnw', 'gradlew'}),
  init_options = {
    bundles = bundles,
  },
  on_attach = function(client, bufnr) 
    require('jdtls').setup_dap({ hotcodereplace = 'auto' })
    require('jdtls.dap').setup_dap_main_class_configs()
  end
}

require('jdtls').start_or_attach(config)

Here are my logs:

:lua print(vim.inspect(vim.lsp.get_active_clients()))

{ {
    _on_attach = <function 1>,
    attached_buffers = { true },
    cancel_request = <function 2>,
    commands = {},
    config = {
      capabilities = {
        callHierarchy = {
          dynamicRegistration = false
        },
        textDocument = {
          codeAction = {
            codeActionLiteralSupport = {
              codeActionKind = {
                valueSet = { "", "quickfix", "refactor", "refactor.extract", "refactor.inline", "refactor.rewrite", "source", "source.organizeImports" }
              }
            },
            dataSupport = true,
            dynamicRegistration = false,
            isPreferredSupport = true,
            resolveSupport = {
              properties = { "edit" }
            }
          },
          completion = {
            completionItem = {
              commitCharactersSupport = false,
              deprecatedSupport = false,
              documentationFormat = { "markdown", "plaintext" },
              preselectSupport = false,
              snippetSupport = false
            },
            completionItemKind = {
              valueSet = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 }
            },
            contextSupport = false,
            dynamicRegistration = false
          },
          declaration = {
            linkSupport = true
          },
          definition = {
            linkSupport = true
          },
          documentHighlight = {
            dynamicRegistration = false
          },
          documentSymbol = {
            dynamicRegistration = false,
            hierarchicalDocumentSymbolSupport = true,
            symbolKind = {
              valueSet = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 }
            }
          },
          hover = {
            contentFormat = { "markdown", "plaintext" },
            dynamicRegistration = false
          },
          implementation = {
            linkSupport = true
          },
          publishDiagnostics = {
            relatedInformation = true,
            tagSupport = {
              valueSet = { 1, 2 }
            }
          },
          references = {
            dynamicRegistration = false
          },
          rename = {
            dynamicRegistration = false,
            prepareSupport = true
          },
          signatureHelp = {
            dynamicRegistration = false,
            signatureInformation = {
              activeParameterSupport = true,
              documentationFormat = { "markdown", "plaintext" },
              parameterInformation = {
                labelOffsetSupport = true
              }
            }
          },
          synchronization = {
            didSave = true,
            dynamicRegistration = false,
            willSave = false,
            willSaveWaitUntil = false
          },
          typeDefinition = {
            linkSupport = true
          }
        },
        window = {
          showDocument = {
            support = true
          },
          showMessage = {
            messageActionItem = {
              additionalPropertiesSupport = false
            }
          },
          workDoneProgress = true
        },
        workspace = {
          applyEdit = true,
          configuration = true,
          symbol = {
            dynamicRegistration = false,
            hierarchicalWorkspaceSymbolSupport = true,
            symbolKind = {
              valueSet = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 }
            }
          },
          workspaceEdit = {
            resourceOperations = { "rename", "create", "delete" }
          },
          workspaceFolders = true
        }
      },
      cmd = { "java", "-Declipse.application=org.eclipse.jdt.ls.core.id1", "-Dosgi.bundles.defaultStartLevel=4", "-Declipse.product=org.eclipse.jdt.ls.core.product", "-Dlog.protocol=true", "-Dlog.level=ALL", "-Xms1g", "--add-modules=ALL-SYSTEM", "--add-opens", "java.base/java.util=ALL-UNNAMED", "--add-opens", "java.base/java.lang=ALL-UNNAMED", "-jar", "/home/virtualmachine/.config/nvim/servers/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/plugins/org.eclipse.equinox.launcher_1.6.400.v20210924-0641.jar", "-configuration", "/home/virtualmachine/.config/nvim/servers/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/config_linux", "-data", "/home/virtualmachine/.cache/nvim/workspaces_jdtls/javatest" },
      flags = {},
      get_language_id = <function 3>,
      handlers = <1>{
        ["language/progressReport"] = <function 4>,
        ["language/status"] = <function 5>,
        ["workspace/configuration"] = <function 6>
      },
      init_options = {
        bundles = { "/home/virtualmachine/.config/nvim/servers/java-debug/com.microsoft.java.debug.plugin/target/com.microsoft.java.debug.plugin-0.42.0.jar" },
        extendedClientCapabilities = {
          advancedExtractRefactoringSupport = true,
          advancedOrganizeImportsSupport = true,
          classFileContentsSupport = true,
          generateConstructorsPromptSupport = true,
          generateDelegateMethodsPromptSupport = true,
          generateToStringPromptSupport = true,
          hashCodeEqualsPromptSupport = true,
          inferSelectionSupport = { "extractMethod", "extractVariable", "extractConstant" },
          moveRefactoringSupport = true,
          overrideMethodsPromptSupport = true,
          progressReportProvider = true
        }
      },
      name = "jdtls",
      on_attach = <function 7>,
      on_init = <function 8>,
      root_dir = "/home/virtualmachine/Documents/javatest",
      settings = {
        java = {
          progressReports = {
            enabled = true
          }
        }
      }
    },
    handlers = <table 1>,
    id = 1,
    initialized = true,
    is_stopped = <function 9>,
    messages = {
      messages = {},
      name = "jdtls",
      progress = {
        ["04fe1960-e577-4a7b-8033-055e9e41ce9e"] = {
          done = true,
          percentage = 0,
          title = "Building"
        },
        ["09a14baa-5dd0-40f6-b63b-12087199e3d5"] = {
          done = true,
          percentage = 0,
          title = "Building"
        },
        ["6b2ba0b3-76f5-46c7-a1a8-7495c8394d70"] = {
          done = true,
          message = "",
          percentage = 100,
          title = "Building"
        },
        ["7bf9422e-9ada-4013-9c8d-6de29b694603"] = {
          done = true,
          message = "",
          percentage = 100,
          title = "Background task"
        },
        ["9358990d-68f3-447d-9b7f-d19f1fcbf0da"] = {
          done = true,
          percentage = 0,
          title = "Validate documents"
        },
        ["9c155b9f-c7b2-480d-8064-bd89bead9832"] = {
          done = true,
          percentage = 100,
          title = "Synchronizing projects"
        },
        ["a432ccf2-67ac-49d6-b439-209d5d59af71"] = {
          done = true,
          percentage = 0,
          title = "Building"
        },
        ["b566c9a1-d316-47f0-bee7-1bbeae42b368"] = {
          done = true,
          percentage = 0,
          title = "Building"
        },
        ["bcc72d5a-a205-4122-b51b-525aa8fc494f"] = {
          done = true,
          percentage = 100,
          title = "Synchronizing projects"
        },
        ["c3cb30e9-a6f5-4d7b-8fbe-24a3032f901c"] = {
          done = true,
          percentage = 100,
          title = "Initialize Workspace"
        },
        ["fcc949c0-3b35-422f-90f2-8b188f657680"] = {
          done = true,
          percentage = 50,
          title = "Publish Diagnostics"
        }
      },
      status = {}
    },
    name = "jdtls",
    notify = <function 10>,
    offset_encoding = "utf-16",
    request = <function 11>,
    request_sync = <function 12>,
    requests = {},
    rpc = {
      is_closing = <function 13>,
      notify = <function 14>,
      request = <function 15>,
      terminate = <function 16>
    },
    server_capabilities = {
      callHierarchyProvider = true,
      codeActionProvider = {
        resolveProvider = true
      },
      codeLensProvider = {
        resolveProvider = true
      },
      completionProvider = {
        resolveProvider = true,
        triggerCharacters = { ".", "@", "#", "*", " " }
      },
      definitionProvider = true,
      documentFormattingProvider = true,
      documentHighlightProvider = true,
      documentOnTypeFormattingProvider = {
        firstTriggerCharacter = ";",
        moreTriggerCharacter = { "\n", "}" }
      },
      documentRangeFormattingProvider = true,
      documentSymbolProvider = true,
      executeCommandProvider = {
        commands = { "vscode.java.checkProjectSettings", "vscode.java.isOnClasspath", "java.project.import", "vscode.java.fetchUsageData", "vscode.java.validateLaunchConfig", "java.navigate.openTypeHierarchy", "java.project.resolveStackTraceLocation", "java.edit.stringFormatting", "vscode.java.resolveMainMethod", "java.project.getSettings", "java.project.resolveWorkspaceSymbol", "java.project.upgradeGradle", "vscode.java.resolveMainClass", "java.project.createModuleInfo", "vscode.java.buildWorkspace", "vscode.java.resolveElementAtSelection", "vscode.java.resolveJavaExecutable", "java.edit.organizeImports", "java.project.refreshDiagnostics", "vscode.java.resolveInlineVariables", "java.project.removeFromSourcePath", "java.project.listSourcePaths", "java.project.getAll", "java.reloadBundles", "java.project.isTestFile", "vscode.java.resolveClassFilters", "java.project.getClasspaths", "java.navigate.resolveTypeHierarchy", "java.project.updateSourceAttachment", "vscode.java.resolveClasspath", "vscode.java.resolveBuildFiles", "vscode.java.updateDebugSettings", "vscode.java.resolveSourceUri", "java.protobuf.generateSources", "vscode.java.fetchPlatformSettings", "java.project.resolveSourceAttachment", "java.project.addToSourcePath", "vscode.java.startDebugSession", "vscode.java.inferLaunchCommandLength" }
      },
      foldingRangeProvider = true,
      hoverProvider = true,
      implementationProvider = true,
      referencesProvider = true,
      renameProvider = {
        prepareProvider = true
      },
      selectionRangeProvider = true,
      semanticTokensProvider = {
        documentSelector = { {
            language = "java",
            scheme = "file"
          }, {
            language = "java",
            scheme = "jdt"
          } },
        full = {
          delta = false
        },
        legend = {
          tokenModifiers = { "abstract", "static", "readonly", "deprecated", "declaration", "documentation", "public", "private", "protected", "native", "generic", "typeArgument", "importDeclaration", "constructor" },
          tokenTypes = { "namespace", "class", "interface", "enum", "enumMember", "type", "typeParameter", "method", "property", "variable", "parameter", "modifier", "keyword", "annotation", "annotationMember", "record", "recordComponent" }
        },
        range = false
      },
      signatureHelpProvider = {
        triggerCharacters = { "(", "," }
      },
      textDocumentSync = {
        change = 2,
        openClose = true,
        save = {
          includeText = true
        }
      },
      typeDefinitionProvider = true,
      workspace = {
        workspaceFolders = {
          changeNotifications = true,
          supported = true
        }
      },
      workspaceSymbolProvider = true
    },
    stop = <function 17>,
    supports_method = <function 18>,
    workspaceFolders = <2>{ {
        name = "/home/virtualmachine/Documents/javatest",
        uri = "file:///home/virtualmachine/Documents/javatest"
      } },
    workspace_folders = <table 2>,
    <metatable> = {
      __index = <function 19>
    }
  } }

The log below is written when I execute :lua require'dap'.continue()

~/.cache/nvim/dap.log

[ WARN ] 2022-11-24T08:31:40Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:960 ]	"No event handler for "	{
  body = {
    processId = 47044,
    shellProcessId = 0,
    type = "processid"
  },
  event = "processid",
  seq = 3,
  type = "event"
}

EDIT:
I did the same experiment, but this time I ran the :lua require('dap').set_log_level('DEBUG') command. This is my new log:

~/.cache/nvim/dap.log

[ DEBUG ] 2022-11-25T11:40:31Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1110 ]	"Connecting to debug adapter"	{
  enrich_config = <function 1>,
  host = "127.0.0.1",
  port = 40943,
  type = "server"
}
[ DEBUG ] 2022-11-25T11:40:31Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    adapterID = "nvim-dap",
    clientId = "neovim",
    clientname = "neovim",
    columnsStartAt1 = true,
    linesStartAt1 = true,
    locale = "en_US.UTF-8",
    pathFormat = "path",
    supportsRunInTerminalRequest = true,
    supportsVariableType = true
  },
  command = "initialize",
  seq = 0,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:31Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    exceptionBreakpointFilters = { {
        filter = "uncaught",
        label = "Uncaught Exceptions"
      }, {
        filter = "caught",
        label = "Caught Exceptions"
      } },
    supportTerminateDebuggee = true,
    supportsBreakpointLocationsRequest = true,
    supportsClipboardContext = true,
    supportsCompletionsRequest = true,
    supportsConditionalBreakpoints = true,
    supportsConfigurationDoneRequest = true,
    supportsDataBreakpoints = true,
    supportsDelayedStackTraceLoading = false,
    supportsEvaluateForHovers = true,
    supportsExceptionInfoRequest = true,
    supportsFunctionBreakpoints = true,
    supportsHitConditionalBreakpoints = true,
    supportsLogPoints = true,
    supportsRestartFrame = true,
    supportsRestartRequest = false,
    supportsSetVariable = true,
    supportsStepInTargetsRequest = true
  },
  command = "initialize",
  request_seq = 0,
  seq = 1,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:31Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    classPaths = { "/home/virtualmachine/.cache/nvim/workspaces_jdtls/javatest/javatest_9b3a851d/bin" },
    console = "integratedTerminal",
    javaExec = "/usr/lib/jvm/java-17-openjdk-amd64/bin/java",
    mainClass = "App",
    modulePaths = {},
    name = "Launch javatest_9b3a851d: App",
    projectName = "javatest_9b3a851d",
    request = "launch",
    type = "java"
  },
  command = "launch",
  seq = 1,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  arguments = {
    args = { "/usr/lib/jvm/java-17-openjdk-amd64/bin/java", "-agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:33267", "-cp", "/home/virtualmachine/.cache/nvim/workspaces_jdtls/javatest/javatest_9b3a851d/bin", "App" },
    kind = "integrated",
    title = "Debug: App"
  },
  command = "runInTerminal",
  seq = 2,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:253 ]	"run_in_terminal"	{
  args = { "/usr/lib/jvm/java-17-openjdk-amd64/bin/java", "-agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:33267", "-cp", "/home/virtualmachine/.cache/nvim/workspaces_jdtls/javatest/javatest_9b3a851d/bin", "App" },
  kind = "integrated",
  title = "Debug: App"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1477 ]	"response"	{
  body = {
    processId = 4365
  },
  command = "runInTerminal",
  request_seq = 2,
  seq = 2,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    processId = 4365,
    shellProcessId = 0,
    type = "processid"
  },
  event = "processid",
  seq = 3,
  type = "event"
}
[ WARN ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:960 ]	"No event handler for "	{
  body = {
    processId = 4365,
    shellProcessId = 0,
    type = "processid"
  },
  event = "processid",
  seq = 3,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    type = "initialized"
  },
  event = "initialized",
  seq = 4,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  command = "launch",
  request_seq = 1,
  seq = 5,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    breakpoints = { {
        line = 3
      }, {
        line = 5
      } },
    lines = { 3, 5 },
    source = {
      name = "App.java",
      path = "/home/virtualmachine/Documents/javatest/App.java"
    },
    sourceModified = false
  },
  command = "setBreakpoints",
  seq = 3,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    breakpoints = { {
        id = 1,
        line = 3,
        message = "",
        verified = true
      }, {
        id = 2,
        line = 5,
        message = "",
        verified = true
      } }
  },
  command = "setBreakpoints",
  request_seq = 3,
  seq = 6,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    filters = {}
  },
  command = "setExceptionBreakpoints",
  seq = 4,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  command = "setExceptionBreakpoints",
  request_seq = 4,
  seq = 7,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  command = "configurationDone",
  seq = 5,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  command = "configurationDone",
  request_seq = 5,
  seq = 8,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    reason = "started",
    threadId = 5,
    type = "thread"
  },
  event = "thread",
  seq = 9,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    reason = "started",
    threadId = 1,
    type = "thread"
  },
  event = "thread",
  seq = 10,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    reason = "started",
    threadId = 6,
    type = "thread"
  },
  event = "thread",
  seq = 11,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    breakpoint = {
      id = 2,
      line = 5,
      message = "",
      verified = true
    },
    reason = "changed",
    type = "breakpoint"
  },
  event = "breakpoint",
  seq = 12,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    breakpoint = {
      id = 1,
      line = 3,
      message = "",
      verified = true
    },
    reason = "changed",
    type = "breakpoint"
  },
  event = "breakpoint",
  seq = 13,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    allThreadsStopped = false,
    reason = "breakpoint",
    threadId = 1,
    type = "stopped"
  },
  event = "stopped",
  seq = 14,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  command = "threads",
  seq = 6,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    threads = { {
        id = 1,
        name = "Thread [main]"
      }, {
        id = 2,
        name = "Thread [Reference Handler]"
      }, {
        id = 3,
        name = "Thread [Finalizer]"
      }, {
        id = 4,
        name = "Thread [Signal Dispatcher]"
      }, {
        id = 5,
        name = "Thread [Notification Thread]"
      }, {
        id = 6,
        name = "Thread [Common-Cleaner]"
      } }
  },
  command = "threads",
  request_seq = 6,
  seq = 15,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    threadId = 1
  },
  command = "stackTrace",
  seq = 7,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    stackFrames = { {
        column = 1,
        id = 1,
        line = 3,
        name = "App.main(String[])",
        source = {
          name = "App.java",
          path = "/home/virtualmachine/Documents/javatest/App.java",
          sourceReference = 0
        }
      } },
    totalFrames = 1
  },
  command = "stackTrace",
  request_seq = 7,
  seq = 16,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    frameId = 1
  },
  command = "scopes",
  seq = 8,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    scopes = { {
        expensive = false,
        name = "Local",
        variablesReference = 2
      } }
  },
  command = "scopes",
  request_seq = 8,
  seq = 17,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    variablesReference = 2
  },
  command = "variables",
  seq = 9,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:32Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    variables = { {
        evaluateName = "args",
        indexedVariables = 0,
        name = "args",
        namedVariables = 0,
        type = "String[]",
        value = "String[0]@8",
        variablesReference = 0
      } }
  },
  command = "variables",
  request_seq = 9,
  seq = 18,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    granularity = "statement",
    threadId = 1
  },
  command = "continue",
  seq = 10,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    allThreadsContinued = false
  },
  command = "continue",
  request_seq = 10,
  seq = 19,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    allThreadsStopped = false,
    reason = "breakpoint",
    threadId = 1,
    type = "stopped"
  },
  event = "stopped",
  seq = 20,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    threadId = 1
  },
  command = "stackTrace",
  seq = 11,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    stackFrames = { {
        column = 1,
        id = 3,
        line = 5,
        name = "App.main(String[])",
        source = {
          name = "App.java",
          path = "/home/virtualmachine/Documents/javatest/App.java",
          sourceReference = 0
        }
      } },
    totalFrames = 1
  },
  command = "stackTrace",
  request_seq = 11,
  seq = 21,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    frameId = 3
  },
  command = "scopes",
  seq = 12,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    scopes = { {
        expensive = false,
        name = "Local",
        variablesReference = 4
      } }
  },
  command = "scopes",
  request_seq = 12,
  seq = 22,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    variablesReference = 4
  },
  command = "variables",
  seq = 13,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:35Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    variables = { {
        evaluateName = "args",
        indexedVariables = 0,
        name = "args",
        namedVariables = 0,
        type = "String[]",
        value = "String[0]@8",
        variablesReference = 0
      } }
  },
  command = "variables",
  request_seq = 13,
  seq = 23,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    granularity = "statement",
    threadId = 1
  },
  command = "stepIn",
  seq = 14,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  command = "stepIn",
  request_seq = 14,
  seq = 24,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    allThreadsStopped = false,
    reason = "step",
    threadId = 1,
    type = "stopped"
  },
  event = "stopped",
  seq = 25,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    threadId = 1
  },
  command = "stackTrace",
  seq = 15,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    stackFrames = { {
        column = 1,
        id = 5,
        line = 1027,
        name = "PrintStream.println(String)"
      }, {
        column = 1,
        id = 6,
        line = 5,
        name = "App.main(String[])",
        source = {
          name = "App.java",
          path = "/home/virtualmachine/Documents/javatest/App.java",
          sourceReference = 0
        }
      } },
    totalFrames = 2
  },
  command = "stackTrace",
  request_seq = 15,
  seq = 26,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    frameId = 6
  },
  command = "scopes",
  seq = 16,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    scopes = { {
        expensive = false,
        name = "Local",
        variablesReference = 7
      } }
  },
  command = "scopes",
  request_seq = 16,
  seq = 27,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    variablesReference = 7
  },
  command = "variables",
  seq = 17,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:45Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    variables = { {
        evaluateName = "args",
        indexedVariables = 0,
        name = "args",
        namedVariables = 0,
        type = "String[]",
        value = "String[0]@8",
        variablesReference = 0
      } }
  },
  command = "variables",
  request_seq = 17,
  seq = 28,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    granularity = "statement",
    threadId = 1
  },
  command = "stepIn",
  seq = 18,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  command = "stepIn",
  request_seq = 18,
  seq = 29,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    allThreadsStopped = false,
    reason = "step",
    threadId = 1,
    type = "stopped"
  },
  event = "stopped",
  seq = 30,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    threadId = 1
  },
  command = "stackTrace",
  seq = 19,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    stackFrames = { {
        column = 1,
        id = 8,
        line = 1028,
        name = "PrintStream.println(String)"
      }, {
        column = 1,
        id = 9,
        line = 5,
        name = "App.main(String[])",
        source = {
          name = "App.java",
          path = "/home/virtualmachine/Documents/javatest/App.java",
          sourceReference = 0
        }
      } },
    totalFrames = 2
  },
  command = "stackTrace",
  request_seq = 19,
  seq = 31,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    frameId = 9
  },
  command = "scopes",
  seq = 20,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    scopes = { {
        expensive = false,
        name = "Local",
        variablesReference = 10
      } }
  },
  command = "scopes",
  request_seq = 20,
  seq = 32,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    variablesReference = 10
  },
  command = "variables",
  seq = 21,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:48Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    variables = { {
        evaluateName = "args",
        indexedVariables = 0,
        name = "args",
        namedVariables = 0,
        type = "String[]",
        value = "String[0]@8",
        variablesReference = 0
      } }
  },
  command = "variables",
  request_seq = 21,
  seq = 33,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    granularity = "statement",
    threadId = 1
  },
  command = "stepIn",
  seq = 22,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  command = "stepIn",
  request_seq = 22,
  seq = 34,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    allThreadsStopped = false,
    reason = "step",
    threadId = 1,
    type = "stopped"
  },
  event = "stopped",
  seq = 35,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    threadId = 1
  },
  command = "stackTrace",
  seq = 23,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    stackFrames = { {
        column = 1,
        id = 11,
        line = 4218,
        name = "String.valueOf(Object)"
      }, {
        column = 1,
        id = 12,
        line = 1028,
        name = "PrintStream.println(String)"
      }, {
        column = 1,
        id = 13,
        line = 5,
        name = "App.main(String[])",
        source = {
          name = "App.java",
          path = "/home/virtualmachine/Documents/javatest/App.java",
          sourceReference = 0
        }
      } },
    totalFrames = 3
  },
  command = "stackTrace",
  request_seq = 23,
  seq = 36,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    frameId = 13
  },
  command = "scopes",
  seq = 24,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    scopes = { {
        expensive = false,
        name = "Local",
        variablesReference = 14
      } }
  },
  command = "scopes",
  request_seq = 24,
  seq = 37,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    variablesReference = 14
  },
  command = "variables",
  seq = 25,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:50Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    variables = { {
        evaluateName = "args",
        indexedVariables = 0,
        name = "args",
        namedVariables = 0,
        type = "String[]",
        value = "String[0]@8",
        variablesReference = 0
      } }
  },
  command = "variables",
  request_seq = 25,
  seq = 38,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:53Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:1445 ]	"request"	{
  arguments = {
    granularity = "statement",
    threadId = 1
  },
  command = "continue",
  seq = 26,
  type = "request"
}
[ DEBUG ] 2022-11-25T11:40:53Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    allThreadsContinued = false
  },
  command = "continue",
  request_seq = 26,
  seq = 39,
  success = true,
  type = "response"
}
[ DEBUG ] 2022-11-25T11:40:53Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    reason = "exited",
    threadId = 1,
    type = "thread"
  },
  event = "thread",
  seq = 40,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:53Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    reason = "started",
    threadId = 13,
    type = "thread"
  },
  event = "thread",
  seq = 41,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:53Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    reason = "exited",
    threadId = 13,
    type = "thread"
  },
  event = "thread",
  seq = 42,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:53Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    exitCode = 0,
    type = "exited"
  },
  event = "exited",
  seq = 43,
  type = "event"
}
[ DEBUG ] 2022-11-25T11:40:54Z-0300 ] ...nvim/site/pack/packer/start/nvim-dap/lua/dap/session.lua:910 ]	{
  body = {
    restart = false,
    type = "terminated"
  },
  event = "terminated",
  seq = 44,
  type = "event"
}

[mfussenegger]

Does jumping to definition of JDK classes work for you (using :lua vim.lsp.buf.definition()) ?

How does your debug configuration look like? (dap.configurations.java)

It looks like the debug adapter is not including the right frames.

E.g. I have stuff like this in the stackTrace response:

      }, {
        column = 1,
        id = 5,
        line = 154,
        name = "DirectMethodHandleAccessor.invokeImpl(Object,Object[])",
        source = {
          name = "DirectMethodHandleAccessor.java",
          path = "jdt://contents/java.base/jdk.internal.reflect/DirectMethodHandleAccessor.class?=app/%5C/home%5C/user%5C/.local%5C/jdks%5C/jdk-18.0.2+9%5C/lib%5C/jrt-fs.jar%60java.base=/javadoc_location=/https:%5C/%5C/docs.oracle.com%5C/en%5C/java%5C/javase%5C/18%5C/docs%5C/api%5C/=/%3Cjdk.internal.reflect(DirectMethodHandleAccessor.class",
          sourceReference = 0
        }

Are you setting stepFilters in your configuration? Afaik that setting influences which frames are included.

[lobophf]

Does jumping to definition of JDK classes work for you (using :lua vim.lsp.buf.definition())?

Yes, I can move in and move out using :lua vim.lsp.buf.definition() and :e# as well.

How does your debug configuration look like? (dap.configurations.java)

I don't have any specific configuration, just the following code:

require('jdtls').setup_dap({ hotcodereplace = 'auto' })

Are you setting stepFilters in your configuration? Afaik that setting influences which frames are included.

I'm not using any step filters, at least not consciously.

In this link, I'm sharing all the setup I'm using for investigation. I decided to do this to isolate to solve the problem.

EDIT: Are you using some decompiler?
I think the answer can be related to the line 103 of this sample.

[mfussenegger]

Are you using some decompiler?

Yes I have configured https://github.com/dgileadi/vscode-java-decompiler, but for the JDK it is not needed if your JDK includes sources. I use the https://adoptium.net/ packages because of that.

I also thought that eclipse.jdt.ls includes basic decompiler capability out-of-the box, but I could misremember things

[lobophf]

Ok, I have no idea why it's not working, but it's not something that bothers me. It's just to have full control like an IDE.
I'm studying nvim and lua, and maybe at some point I'll have the answer.

[paulroemer]

Hey guys,

I know it's a long time ago since the discussion ended but I stumbled over the same issue. I created a small hello world Maven project and enabled debug logging for nvim-dap. As lobophf I am able to jump into the decompiled classes by using :lua vim.lsp.buf.definition() but stepping into in the debugger doesn't work.

dap.log

lsp.log

OR][2025-08-01 11:56:40] ...p/_transport.lua:36     "rpc"   "/usr/lib64/jvm/jre-21-openjdk/bin/java"        "stderr"        "WARNING: Using incubator modules: jdk.incubator.vector\n"
[ERROR][2025-08-01 11:56:41] ...p/_transport.lua:36     "rpc"   "/usr/lib64/jvm/jre-21-openjdk/bin/java"        "stderr"        "Aug. 01, 2025 11:56:41 AM org.apache.aries.spifly.BaseActivator log\nINFORMATION: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic\n"
[WARN][2025-08-01 11:56:45] ...m/lsp/client.lua:874     "The language server jdtls triggers a registerCapability handler for workspace/didChangeWorkspaceFolders despite dynamicRegistration set to false. Report upstream, this warning is harmless"
[ERROR][2025-08-01 11:56:46] ...lsp/handlers.lua:562    "01.08.2025, 11:56:46 Command _java.reloadBundles.command not supported on client"
[ERROR][2025-08-01 11:57:13] ...p/_transport.lua:36     "rpc"   "/usr/lib64/jvm/jre-21-openjdk/bin/java"        "stderr"        "Aug. 01, 2025 11:57:13 AM com.microsoft.java.debug.plugin.internal.JavaDebuggerServerPlugin start\nINFORMATION: Starting com.microsoft.java.debug.plugin\n"
[ERROR][2025-08-01 11:58:03] ...p/_transport.lua:36     "rpc"   "/usr/lib64/jvm/jre-21-openjdk/bin/java"        "stderr"        "Aug. 01, 2025 11:58:03 AM com.microsoft.java.debug.core.UsageDataSession recordInfo\nINFORMATION: launch debug info\n"
[ERROR][2025-08-01 11:58:03] ...p/_transport.lua:36     "rpc"   "/usr/lib64/jvm/jre-21-openjdk/bin/java"        "stderr"        "Aug. 01, 2025 11:58:03 AM com.microsoft.java.debug.core.adapter.handler.LaunchRequestHandler launch\nINFORMATION: Trying to launch Java Program with options:\nmain-class: hello.HelloWorld\nargs: \nmodule-path: \nclass-path: /home/vaadin/tmp/java-hello-world-with-maven/target/classes\nvmArgs: \n"
[WARN][2025-08-01 11:58:03] .../lua/vim/lsp.lua:1023    "buf_attach_client called on unloaded buffer (id: 8): "
[ERROR][2025-08-01 11:58:03] ...p/_transport.lua:36     "rpc"   "/usr/lib64/jvm/jre-21-openjdk/bin/java"        "stderr"        "Aug. 01, 2025 11:58:03 AM com.microsoft.java.debug.core.adapter.handler.LaunchWithDebuggingDelegate lambda$launchInTerminal$0\nINFORMATION: Launching debuggee in terminal console succeeded.\n"

My java.lua ftplugin config that also adds the java decompiler JARs:

local home = os.getenv('HOME')
local jdtls = require('jdtls')
local root_markers = {'gradlew', 'mvnw', '.git'}
local root_dir = require('jdtls.setup').find_root(root_markers)
local workspace_folder = home .. "/.local/share/eclipse/" .. vim.fn.fnamemodify(root_dir, ":p:h:t")

local remap = require("me.util").remap

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
local on_attach = function(client, bufnr)
  jdtls.setup_dap({ hotcodereplace = 'auto' })
  jdtls.setup.add_commands()

  -- Default keymaps
  local bufopts = { noremap=true, silent=true, buffer=bufnr }
  require("lsp.defaults").on_attach(client, bufnr)

  -- Java extensions
  remap("n", "<C-o>", jdtls.organize_imports, bufopts, "Organize imports")
  remap("n", "<leader>vc", jdtls.test_class, bufopts, "Test class (DAP)")
  remap("n", "<leader>vm", jdtls.test_nearest_method, bufopts, "Test method (DAP)")
  remap("n", "<space>ev", jdtls.extract_variable, bufopts, "Extract variable")
  remap("n", "<space>ec", jdtls.extract_constant, bufopts, "Extract constant")
  remap("v", "<space>em", [[<ESC><CMD>lua require('jdtls').extract_method(true)<CR>]], bufopts, "Extract method")
end

-- Java Debug adapter
local bundles = {
  vim.fn.glob('/home/vaadin/progs/java-debug/com.microsoft.java.debug.plugin/target/com.microsoft.java.debug.plugin-*.jar'),
}
vim.list_extend(bundles, vim.split(vim.fn.glob('/home/vaadin/progs/vscode-java-test/server/*.jar'), "\n"))
vim.list_extend(bundles, vim.split(vim.fn.glob('/home/vaadin/progs/vscode-java-decompiler/server/*.jar'), "\n"))

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require('cmp_nvim_lsp').default_capabilities(capabilities)

local config = {
  flags = {
    debounce_text_changes = 80,
  },
  capabilities = capabilities,
  on_attach = on_attach,
  init_options = {
    bundles = bundles
  },
  root_dir = root_dir,
  settings = {
    java = {
      format = {
        settings = {
          url = "/.local/share/eclipse/VaadinJavaConventions_2024.xml",
          profile = "Vaadin Java Conventions 20241010",
        },
      },
      home = "/usr/lib64/jvm/java-21-openjdk-21",
      signatureHelp = { enabled = true },
      contentProvider = { preferred = 'fernflower' },
      saveActions = {
        organizeImports = true,
      },
      completion = {
        favoriteStaticMembers = {
          "org.hamcrest.MatcherAssert.assertThat",
          "org.hamcrest.Matchers.*",
          "org.hamcrest.CoreMatchers.*",
          "org.junit.jupiter.api.Assertions.*",
          "java.util.Objects.requireNonNull",
          "java.util.Objects.requireNonNullElse",
          "org.mockito.Mockito.*"
        },
        filteredTypes = {
          "com.sun.*",
          "io.micrometer.shaded.*",
          "java.awt.*",
          "jdk.*",
          "sun.*",
        },
        completion = { 
          importOrder = { "jakarta", "javax", "java", "com.google.gwt", "com.vaadin", "elemental" } 
        },
      },
      sources = {
        organizeImports = {
          starThreshold = 9999;
          staticStarThreshold = 9999;
        },
      },
      codeGeneration = {
        toString = {
          template = "${object.className}{${member.name()}=${member.value}, ${otherMembers}}"
        },
        hashCodeEquals = {
          useJava7Objects = true,
        },
        useBlocks = true,
        addFinalForNewDeclaration = "fields",
      },
      configuration = {
        runtimes = {
--          {
--            name = "JavaSE-1.8",
--            path = "/usr/lib64/jvm/java-1.8.0-openjdk-1.8.0"
--          },
          {
            name = "JavaSE-11",
            path = "/usr/lib64/jvm/java-11-openjdk-11",
          },
          {
            name = "JavaSE-17",
            path = "/usr/lib64/jvm/java-17-openjdk-17",
          },
          {
            name = "JavaSE-21",
            path = "/usr/lib64/jvm/java-21-openjdk-21",
          },
        }
      }
    }
  },
  cmd = {
    "/usr/lib64/jvm/jre-21-openjdk/bin/java",
    '-Declipse.application=org.eclipse.jdt.ls.core.id1',
    '-Dosgi.bundles.defaultStartLevel=4',
    '-Declipse.product=org.eclipse.jdt.ls.core.product',
    '-Dlog.protocol=true',
    '-Dlog.level=ALL',
    "-XX:+UseTransparentHugePages",
    "-XX:+AlwaysPreTouch",
    '-Xmx4g',
    '--add-modules=ALL-SYSTEM',
    '--add-opens', 'java.base/java.util=ALL-UNNAMED',
    '--add-opens', 'java.base/java.lang=ALL-UNNAMED',
    '-javaagent:/home/vaadin/dl/lombok.jar',
    '-jar', vim.fn.glob('/home/vaadin/progs/eclipsejdt/plugins/org.eclipse.equinox.launcher_*.jar'),
    '-configuration', '/home/vaadin/progs/eclipsejdt/config_linux',
    '-data', workspace_folder,
  },
}

local M = {}
function M.make_jdtls_config()
  return config
end
return M

and nvim-dap config:

require('dap.ext.vscode').load_launchjs()

local dap, dapui = require("dap"), require("dapui")
dap.defaults.fallback.terminal_win_cmd = 'tabnew'
dapui.setup({})

dap.listeners.after.event_initialized["dapui_config"] = function()
    dapui.open()
end
--dap.listeners.before.event_terminated["dapui_config"] = function()
--    dapui.close()
--end
--dap.listeners.before.event_exited["dapui_config"] = function()
--    dapui.close()
--end

dap.configurations.java = {
    {
        type = "java",
        request = "attach",
        name = "Debug (Attach) - Remote",
        hostName = "127.0.0.1",
        port = 5005,
    },
}

What bugs me is

[DEBUG] 2025-08-01 09:17:29 dap/session.lua:1049        1       {
  body = {
    name = "dap",
    properties = {
      command = "stackTrace",
      decompileSupport = "OFF",
      duration = 9,
      isDecompilerInvoked = "false"
    },
    type = "telemetry"
  },
  event = "telemetry",
  seq = 15,
  type = "event"
}

Sounds like there is no decompiler support in general. But where does this message originates from? DAP, JDTLS or the java-debugger itself?

The result is that there is no source property for the PrintStream frame where it should be some jdt:// reference:

[DEBUG] 2025-08-01 09:18:11 dap/session.lua:1049        1       {
  body = {
    stackFrames = { {
        column = 1,
        id = 3,
        line = 1167,
        name = "PrintStream.println(String)"
      }, {
        column = 1,
        id = 4,
        line = 5,
        name = "HelloWorld.main(String[])",
        source = {
          name = "HelloWorld.java",
          path = "/home/vaadin/tmp/java-hello-world-with-maven/src/main/java/hello/HelloWorld.java",
          sourceReference = 0
        }
      } },
    totalFrames = 2
  },
  command = "stackTrace",
  request_seq = 23,
  seq = 43,
  success = true,
  type = "response"
}

[paulroemer]

Not sure if related by any means: microsoft/java-debug#259

[paulroemer]

Investigating further. Stumbled over https://github.com/microsoft/java-debug/blob/main/com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/DebugSettings.java#L47 that represents the value of decompileSupport property from the dap.log. See https://github.com/microsoft/java-debug/blob/main/com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/adapter/handler/StackTraceRequestHandler.java#L137

@mfussenegger, am I on the right path or totally wrong? I tried turning the switch on by setting

jdtls.setup_dap({ hotcodereplace = 'auto', debugSupportOnDecompiledSource = 'on'})

But no difference. I guess those settings are not reflected to the java-debug 1:1 but setup_dap() needs to be aware of it as hotcodereplace would be hotCodeReplace (camelCase)...

[paulroemer]

Ah, indeed. It only supports JdtSetupDapOpts.

[paulroemer]

I patched java-debug to turn on the decompiler support by default. Log output changes but behavior does not:

  body = {
    name = "dap",
    properties = {
      command = "stackTrace",
      decompileSupport = "ON",
      duration = 2,
      isDecompilerInvoked = "false"
    },
    type = "telemetry"
  },
  event = "telemetry",
  seq = 42,
  type = "event"
}
[DEBUG] 2025-08-04 05:43:40 dap/session.lua:1049        2       {
  body = {
    stackFrames = { {
        column = 1,
        id = 3,
        line = 1167,
        name = "PrintStream.println(String)"
      }, {
        column = 1,
        id = 4,
        line = 5,
        name = "HelloWorld.main(String[])",
        source = {
          name = "HelloWorld.java",
          path = "/home/vaadin/tmp/java-hello-world-with-maven/src/main/java/hello/HelloWorld.java",
          sourceReference = 0
        }
      } },
    totalFrames = 2
  },
  command = "stackTrace",
  request_seq = 23,
  seq = 43,
  success = true,
  type = "response"
}