ClassCastException when trying to get Element from Node

[schabe77]

Describe the bug

Hi,
I'm using aws-cdk for java. After upgrading the artifact software.amazon.jsii:jsii-runtime from version 1.85.0 to 1.86.0 a lot of my stacks don't compile anymore. Here an example stack

public class RolesAnywhereStack extends Stack {
    public RolesAnywhereStack(App parent) {
        super(parent, "RolesAnywhereStack");
        final Role bastionRole = Role.Builder.create(this, "RolesAnywhereBastionRole")
                .assumedBy(new ServicePrincipal("rolesanywhere.amazonaws.com"))
                .description("Role that is used when connecting via RolesAnywhere")
                .build();
        CfnRole cfnRole = (CfnRole) bastionRole.getNode().getDefaultChild();
    }
}

when running cdk synthesize RolesAnywhereStack a ClassCastException occurs:

Caused by: java.lang.ClassCastException: class software.constructs.Construct cannot be cast to class software.amazon.awscdk.services.iam.CfnRole (software.constructs.Construct and software.amazon.awscdk.services.iam.CfnRole are in unnamed module of loader java.net.URLClassLoader @7486e0ca)

with jsii-runtime 1.85.0 everything works fine.

Expected Behavior

No ClassCastException

Current Behavior

ClassCastException

Reproduction Steps

try to synthesize this stack

public class RolesAnywhereStack extends Stack {
    public RolesAnywhereStack(App parent) {
        super(parent, "RolesAnywhereStack");
        final Role bastionRole = Role.Builder.create(this, "RolesAnywhereBastionRole")
                .assumedBy(new ServicePrincipal("rolesanywhere.amazonaws.com"))
                .description("Role that is used when connecting via RolesAnywhere")
                .build();
        CfnRole cfnRole = (CfnRole) bastionRole.getNode().getDefaultChild();
    }
}

Possible Solution

No response

Additional Information/Context

No response

SDK version used

software.amazon.jsii:jsii-runtime:1.85.0

Environment details (OS name and version, etc.)

Debian openjdk version "17.0.2" 2022-01-18 OpenJDK Runtime Environment (build 17.0.2+8-86) OpenJDK 64-Bit Server VM (build 17.0.2+8-86, mixed mode, sharing)

[n-orlov]

got similar issue with function.addAlias() (lambda function construct):

java.lang.ClassCastException: class software.constructs.Construct cannot be cast to class software.amazon.awscdk.services.lambda.Alias (software.constructs.Construct and software.amazon.awscdk.services.lambda.Alias are in unnamed module of loader 'app')

Reverting to jsii 1.85.0 helped:

            <dependency>
                <groupId>software.amazon.jsii</groupId>
                <artifactId>jsii-runtime</artifactId>
                <version>1.85.0</version>
            </dependency>

[ielkhalloufi]

See the other issue how I created a workaround: aws/aws-cdk#26604

[github-actions]

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