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