Reflection exception at org.jboss.classfilewriter.ClassFile on JDK12 -------------------------------------------------------------------- Key: WFLY-11406 URL: https://issues.jboss.org/browse/WFLY-11406 Project: WildFly Issue Type: Bug Components: Server Reporter: Richard Opalka Assignee: Stuart Douglas Priority: Critical Labels: jdk12 Fix For: 16.0.0.Beta1 When running WildFly on JDK12 I'm observing this exception due to Unsafe changes in recent JDK Early Access builds: &amp#27;[0m&amp#27;[31m16:47:17,739 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-6) MSC000001: Failed to start service jboss.deployment.unit."ws-endpoint-example.war".IN <------>at org.jboss.as.server@7.0.0.CR1-SNAPSHOT//org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:151) <------>at org.jboss.msc@1.4.5.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1738) <------>at org.jboss.msc@1.4.5.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1700) <------>at org.jboss.msc@1.4.5.Final//org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1558) <------>at org.jboss.threads@2.3.2.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) <------>at org.jboss.threads@2.3.2.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985) <------>at org.jboss.threads@2.3.2.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487) <------>at org.jboss.threads@2.3.2.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378) <------>at java.base/java.lang.Thread.run(Thread.java:835) Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: WFLYEE0024: Could not configure component TestService <------>at org.jboss.as.ee@15.0.0.CR1-SNAPSHOT//org.jboss.as.ee.component.deployers.EEModuleConfigurationProcessor.deploy(EEModuleConfigurationProcessor.java:106) <------>at org.jboss.as.server@7.0.0.CR1-SNAPSHOT//org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:144) <------>... 8 more Caused by: java.lang.Error: java.lang.NoSuchFieldException: override <------>at org.jboss.classfilewriter@1.2.3.Final//org.jboss.classfilewriter.ClassFile$1.run(ClassFile.java:394) <------>at org.jboss.classfilewriter@1.2.3.Final//org.jboss.classfilewriter.ClassFile$1.run(ClassFile.java:385) <------>at java.base/java.security.AccessController.doPrivileged(AccessController.java:551) <------>at org.jboss.classfilewriter@1.2.3.Final//org.jboss.classfilewriter.ClassFile.<clinit>(ClassFile.java:385) <------>at org.jboss.invocation@1.5.1.Final//org.jboss.invocation.proxy.AbstractClassFactory.<init>(AbstractClassFactory.java:97) <------>at org.jboss.invocation@1.5.1.Final//org.jboss.invocation.proxy.AbstractSubclassFactory.<init>(AbstractSubclassFactory.java:87) <------>at org.jboss.invocation@1.5.1.Final//org.jboss.invocation.proxy.AbstractProxyFactory.<init>(AbstractProxyFactory.java:69) <------>at org.jboss.invocation@1.5.1.Final//org.jboss.invocation.proxy.ProxyFactory.<init>(ProxyFactory.java:256) <------>at org.jboss.as.ee@15.0.0.CR1-SNAPSHOT//org.jboss.as.ee.component.DefaultComponentViewConfigurator.configure(DefaultComponentViewConfigurator.java:86) <------>at org.jboss.as.ee@15.0.0.CR1-SNAPSHOT//org.jboss.as.ee.component.deployers.EEModuleConfigurationProcessor.deploy(EEModuleConfigurationProcessor.java:92) <------>... 9 more Caused by: java.lang.NoSuchFieldException: override <------>at java.base/java.lang.Class.getDeclaredField(Class.java:2410) <------>at org.jboss.classfilewriter@1.2.3.Final//org.jboss.classfilewriter.ClassFile$1.run(ClassFile.java:392) <------>... 18 more