[jboss-jira] [JBoss JIRA] (WFLY-9182) ConcurrentModificationException during deployment

ConcurrentModificationException during deployment ------------------------------------------------- Key: WFLY-9182 URL: https://issues.jboss.org/browse/WFLY-9182 Project: WildFly Issue Type: Bug Components: CDI / Weld Environment: RHEL6 x86_64 IBM JDK 8 SR4 FP6 Reporter: Martin Kouba Assignee: Martin Kouba During our automated testing, this issue occured: {code:java} 20:29:41,817 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host./contextRoot.UndertowDeploymentInfoService: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./contextRoot.UndertowDeploymentInfoService: Failed to start service at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1978) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1153) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.lang.Thread.run(Thread.java:785) Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1448) at java.util.HashMap$KeyIterator.next(HashMap.java:1472) at org.jboss.weld.util.collections.Iterators$TransformingIterator.next(Iterators.java:142) at org.jboss.weld.util.collections.Iterators$TransformingIterator.next(Iterators.java:142) at org.jboss.weld.util.collections.Iterators$CombinedIterator.hasNext(Iterators.java:95) at org.jboss.weld.util.collections.Iterators$CombinedIterator.hasNext(Iterators.java:94) at org.jboss.weld.resolution.AbstractTypeSafeBeanResolver$1.computeValue(AbstractTypeSafeBeanResolver.java:151) at org.jboss.weld.resolution.AbstractTypeSafeBeanResolver$1.computeValue(AbstractTypeSafeBeanResolver.java:146) at org.jboss.weld.util.LazyValueHolder.get(LazyValueHolder.java:49) at org.jboss.weld.resolution.AbstractTypeSafeBeanResolver.getBeans(AbstractTypeSafeBeanResolver.java:238) at org.jboss.weld.resolution.AbstractTypeSafeBeanResolver.getAllBeans(AbstractTypeSafeBeanResolver.java:217) at org.jboss.weld.resolution.TypeSafeResolver.findMatching(TypeSafeResolver.java:102) at org.jboss.weld.resolution.TypeSafeResolver.access$000(TypeSafeResolver.java:41) at org.jboss.weld.resolution.TypeSafeResolver$ResolvableToBeanCollection.apply(TypeSafeResolver.java:52) at org.jboss.weld.resolution.TypeSafeResolver$ResolvableToBeanCollection.apply(TypeSafeResolver.java:43) at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache$1.apply(ReentrantMapBackedComputingCache.java:55) at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache$1.apply(ReentrantMapBackedComputingCache.java:51) at org.jboss.weld.util.cache.ReentrantMapBackedComputingCache.getValue(ReentrantMapBackedComputingCache.java:64) at org.jboss.weld.resolution.TypeSafeResolver.resolve(TypeSafeResolver.java:88) at org.jboss.weld.manager.BeanManagerImpl.getBeans(BeanManagerImpl.java:557) at org.jboss.as.weld.deployment.WeldClassIntrospector.getInjectionTarget(WeldClassIntrospector.java:77) at org.jboss.as.weld.deployment.WeldClassIntrospector.createFactory(WeldClassIntrospector.java:57) at org.jboss.as.ee.component.ComponentRegistry.createInstanceFactory(ComponentRegistry.java:76) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.createServletConfig(UndertowDeploymentInfoService.java:726) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.start(UndertowDeploymentInfoService.java:273) at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:2032) at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1955) ... 3 more {code} I wasn't able to reproduce it again yet. The issue occured only once on RHEL6 x86_64 with IBM JDK 8 SR4 FP6. The scenario was to deploy EJB jar via Arquillian and do some testing. But deployment failed with above exception. Check full log and deployment jar in attachment.