morazow opened a new issue, #2712: URL: https://github.com/apache/fluss/issues/2712
### Search before asking - [x] I searched in the [issues](https://github.com/apache/fluss/issues) and found nothing similar. ### Fluss version main (development) ### Please describe the bug 🐞 When enabled, the JMX reporters fails with following error: ``` 2026-02-24 15:26:40,487 ERROR org.apache.fluss.metrics.reporter.ReporterSetup [] - Could not instantiate MetricReporter with name jmx. Metrics might not be exposed/reported. java.lang.IllegalAccessError: superclass access check failed: class org.apache.fluss.metrics.jmx.JMXServer$JmxRegistry (in unnamed module @0x41294f8) cannot access class sun.rmi.registry.RegistryImpl (in module java.rmi) because module java.rmi does not export sun.rmi.registry to unnamed module @0x41294f8 at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?] at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:?] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:?] at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:?] at java.net.URLClassLoader$1.run(Unknown Source) ~[?:?] at java.net.URLClassLoader$1.run(Unknown Source) ~[?:?] at java.security.AccessController.doPrivileged(Unknown Source) ~[?:?] at java.net.URLClassLoader.findClass(Unknown Source) ~[?:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:?] at org.apache.fluss.classloading.ComponentClassLoader.loadClassFromComponentOnly(ComponentClassLoader.java:153) ~[fluss-server-0.8.0-incubating.jar:0.8.0-incubating] at org.apache.fluss.classloading.ComponentClassLoader.loadClassFromOwnerFirst(ComponentClassLoader.java:175) ~[fluss-server-0.8.0-incubating.jar:0.8.0-incubating] at org.apache.fluss.classloading.ComponentClassLoader.loadClass(ComponentClassLoader.java:110) ~[fluss-server-0.8.0-incubating.jar:0.8.0-incubating] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:?] at org.apache.fluss.metrics.jmx.JMXServer.internalStart(JMXServer.java:94) ~[?:?] at org.apache.fluss.metrics.jmx.JMXServer.start(JMXServer.java:62) ~[?:?] at org.apache.fluss.metrics.jmx.JMXService.startJMXServerWithPortRanges(JMXService.java:90) ~[?:?] at org.apache.fluss.metrics.jmx.JMXService.startInstance(JMXService.java:59) ~[?:?] at org.apache.fluss.metrics.jmx.JMXReporter.<init>(JMXReporter.java:75) ~[?:?] at org.apache.fluss.metrics.jmx.JMXReporterPlugin.createMetricReporter(JMXReporterPlugin.java:32) ~[?:?] at org.apache.fluss.metrics.jmx.JMXReporterPlugin.createMetricReporter(JMXReporterPlugin.java:25) ~[?:?] at org.apache.fluss.metrics.reporter.ReporterSetup.setUpReporters(ReporterSetup.java:131) [fluss-server-0.8.0-incubating.jar:0.8.0-incubating] at org.apache.fluss.metrics.reporter.ReporterSetup.fromConfiguration(ReporterSetup.java:59) [fluss-server-0.8.0-incubating.jar:0.8.0-incubating] at org.apache.fluss.metrics.registry.MetricRegistry.create(MetricRegistry.java:72) [fluss-server-0.8.0-incubating.jar:0.8.0-incubating] at org.apache.fluss.server.coordinator.CoordinatorServer.startServices(CoordinatorServer.java:164) ``` ### Solution Use `LocateRegistry.createRegistry` factory that uses JDK internals from inside the JDK module. ### Are you willing to submit a PR? - [x] I'm willing to submit a PR! -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
