[Copilot]

Investigates the WebLogic startup report with a dependency-free fixture that exercises real -javaagent initialization. A child-first system loader triggers IllegalStateException: agent initializer should be loaded in boot loader; normal and parent-first loaders initialize successfully.

• Reproduction: Asserts the exact exception, startup stack, and uninitialized-agent state despite application exit code 0.
• Results: Reproduces the synthetic failure with released agent 2.33.0 and source-built 3.0.0-SNAPSHOT on JDKs 11 and 25.
• Scope: No production changes. Documents runnable commands, exact versions, and Node Manager retest steps; WebLogic’s actual loader behavior remains unconfirmed without the original licensed environment.

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Waiting on the author · refreshed 2026-10-23 23:01 UTC

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[Copilot]

🟢 Approval recommended

The changes are limited to focused reproduction tests and documentation, with no unresolved blocking findings.

No open issues 🎉

What changed in this PR

Adds an isolated reproduction of agent bootstrap failure with a child-first system loader, without changing production code. The fixture demonstrates the failure mechanism but does not establish WebLogic’s actual loader behavior.

Changes:

• Adds dependency-free fixtures for custom class loading and startup-state observation.
• Tests real -javaagent initialization with normal, parent-first, and child-first loaders.
• Documents standalone reproduction commands, observed results, and WebLogic confirmation steps.

File	Description
javaagent/​src/​test/​java/​jvmbootstraptest/​ChildFirstSystemClassLoader.java	Provides a synthetic loader with child-first and parent-first modes.
javaagent/​src/​test/​java/​jvmbootstraptest/​AgentStartupProbe.java	Reports loader identities and agent startup state after premain.
javaagent/​src/​test/​java/​io/​opentelemetry/​javaagent/​CustomSystemClassLoaderTest.java	Verifies successful controls and the exact child-first bootstrap failure.
javaagent/​README.md	Documents reproduction procedures, results, and investigation limits.

_{Review effort: Balanced}