ADDITIONAL SYSTEM INFORMATION :
Win 10,
JDK 11, JDK 18

A DESCRIPTION OF THE PROBLEM :
Getting an "duplicate class definition" error when having a static method that returns a super type of the the surrounding type. The method does not need to be called.

reported in https://bugs.eclipse.org/bugs/show_bug.cgi?id=578077#c5

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :

run this with Vm Argument -XX:StartFlightRecording:filename=recording.jfr,dumponexit=true -XX:FlightRecorderOptions=stackdepth=-1


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no warning, no exception
ACTUAL -
[0.345s][info][jfr,startup] Started recording 1. No limit specified, using maxsize=250MB as default.
[0.345s][info][jfr,startup]
[0.345s][info][jfr,startup] Use jcmd 37408 JFR.dump name=1 to copy recording data to file.
[0.375s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.377s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.377s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.378s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.378s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.378s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.379s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.379s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.379s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.380s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.380s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.380s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.380s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.381s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.381s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.381s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.381s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.381s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.382s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.382s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.382s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.382s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.383s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.383s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.383s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.383s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.383s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.383s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.384s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.384s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.384s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.384s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.385s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.385s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.385s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.385s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.385s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.386s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.386s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.386s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.386s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.386s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.387s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.387s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.387s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.387s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.387s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.387s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.388s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.388s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.388s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.388s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.388s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.388s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.388s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.389s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.390s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.390s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.390s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.390s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.390s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.390s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.390s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.391s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.391s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.391s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.391s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.391s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.391s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.391s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.392s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
[0.393s][warning][jfr,system ] Unexpected error when adding instrumentation for event type <Unknown>
Exception in thread "main" java.lang.LinkageError: loader 'app' attempted duplicate class definition for p.MyJfrEvent. (p.MyJfrEvent is in unnamed module of loader 'app')
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3402)
at java.base/java.lang.Class.getDeclaredMethods(Class.java:2504)
at jdk.jfr/jdk.jfr.internal.EventControl.defineSettings(EventControl.java:143)
at jdk.jfr/jdk.jfr.internal.EventControl.<init>(EventControl.java:134)
at jdk.jfr/jdk.jfr.internal.MetadataRepository.makeHandler(MetadataRepository.java:183)
at jdk.jfr/jdk.jfr.internal.MetadataRepository.register(MetadataRepository.java:142)
at jdk.jfr/jdk.jfr.internal.MetadataRepository.register(MetadataRepository.java:130)
at jdk.jfr/jdk.jfr.FlightRecorder.register(FlightRecorder.java:136)
at p.AbstractJfrEvent.<clinit>(AbstractJfrEvent.java)


---------- BEGIN SOURCE ----------

class AbstractJfrEvent extends jdk.jfr.Event {

static MyJfrEvent createEvent() {
return new MyJfrEvent();
}

public static void main(String[] args) {
new MyJfrEvent();
// AbstractJfrEvent.createEvent();
}
}

class MyJfrEvent extends AbstractJfrEvent {
};
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
remove "createEvent()" from class.


FREQUENCY : always