HTTP + EJB - UnsupportedOperationException trying to write to an AbstractMap ---------------------------------------------------------------------------- Key: WFLY-10016 URL: https://issues.jboss.org/browse/WFLY-10016 Project: WildFly Issue Type: Bug Components: EJB Reporter: Brian Stansberry Assignee: Stuart Douglas [~tremes] Has hit this failure when running some tests against our OpenShift images using WF code from, I believe, 12 CR1. {code} 13:03:50,832 ERROR [org.jboss.as.ejb3.remote] (default task-1) WFLYEJB0150: Could not write method invocation failure for method public abstract void com.redhat.xpaas.ejb.server.RemoteCounter.increment() on bean named CounterBean for appname modulename ROOT distinctname due to: java.lang.UnsupportedOperationException at java.util.AbstractMap.put(AbstractMap.java:209) at org.jboss.as.ejb3.remote.AssociationImpl.updateAffinities(AssociationImpl.java:267) at org.jboss.as.ejb3.remote.AssociationImpl.lambda$receiveInvocationRequest$0(AssociationImpl.java:233) at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378) at java.lang.Thread.run(Thread.java:748) {code} He or [~luck3y] can give you more details re the specific test. Just walking through code, my guess is the Collections.emptyMap() produced at [1] is getting passed through the stack to the failing code. (I'm filing this because I did this bit of brilliant analysis. ;) ) [1] https://github.com/wildfly/wildfly-http-client/blob/master/ejb/src/main/j...