FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
When a class that is loaded by an anonymous class loader (e.g. a lambda expression's class) is retransformed, the retransformation process causes the class to loose its properties as an anonymous class. As a result, verifier errors or no class def found errors are triggered.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the below code example from a Java agent in order to get hold of an instance of the instrumentation interface.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The transformation should be a no-op, i.e. the transformation should not have an effect.
ACTUAL -
Errors are thrown.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
class Foo {
    void notFoundAfterRetransform() throws Exception {
        Instrumentation instrumentation = ... // run via an agent.
        instrumentation.addTransformer((loader, className, classBeingRedefined, protectionDomain, classfileBuffer) -> null, true); // No-op

        instrumentation.retransformClasses(fooHolder().getClass()); // instrumentation.isModifiableClass(type) == true

        fooHolder().getClass();
    }

  void verifierErrorOnRetransform() throws Exception {
        Instrumentation instrumentation = ByteBuddyAgent.install();
        instrumentation.addTransformer((loader, className, classBeingRedefined, protectionDomain, classfileBuffer) -> null, true); // No-op

        instrumentation.retransformClasses(barHolder().getClass()); // instrumentation.isModifiableClass(type) == true
    }

    Function<?, ?> fooHolder() {
        return this::foo;
    }

    public Object foo(Object p) {
        return null;
    }

    Function<?, ?> barHolder() {
        return this::bar;
    }

    private Object bar(Object p) {
        return null;
    }
}
---------- END SOURCE ----------