Another issue related to https://issues.jboss.org/browse/RESTEASY-762 and https://issues.jboss.org/browse/RESTEASY-1044

13:39:16,587 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC000001: Failed to start service jboss.deployment.unit."urlfilter-composite-northbound-1.0.12.jar".SwitchYardService: org.jboss.msc.service.StartException in service jboss.deployment.unit."urlfilter-composite-northbound-1.0.12.jar".SwitchYardService: java.lang.RuntimeException: java.util.ConcurrentModificationException
at org.switchyard.as7.extension.services.SwitchYardService.start(SwitchYardService.java:80)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_45]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_45]
at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_45]
Caused by: java.lang.RuntimeException: java.util.ConcurrentModificationException
at org.jboss.resteasy.plugins.providers.RegisterBuiltin.register(RegisterBuiltin.java:35)
at org.jboss.resteasy.spi.ResteasyProviderFactory.getInstance(ResteasyProviderFactory.java:354)
at org.switchyard.component.resteasy.util.ClientInvoker.<init>(ClientInvoker.java:151)
at org.switchyard.component.resteasy.OutboundHandler.doStart(OutboundHandler.java:122)
at org.switchyard.deploy.BaseServiceHandler.start(BaseServiceHandler.java:60)
at org.switchyard.deploy.internal.Deployment.deployReferenceBindings(Deployment.java:310)
at org.switchyard.deploy.internal.Deployment.start(Deployment.java:143)
at org.switchyard.as7.extension.deployment.SwitchYardDeployment.start(SwitchYardDeployment.java:101)
at org.switchyard.as7.extension.services.SwitchYardService.start(SwitchYardService.java:73)
... 5 more
Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859) [rt.jar:1.7.0_45]
at java.util.ArrayList$Itr.next(ArrayList.java:831) [rt.jar:1.7.0_45]
at org.jboss.resteasy.core.interception.InterceptorRegistry.register(InterceptorRegistry.java:215)
at org.jboss.resteasy.spi.ResteasyProviderFactory.registerProvider(ResteasyProviderFactory.java:884)
at org.jboss.resteasy.core.ThreadLocalResteasyProviderFactory.registerProvider(ThreadLocalResteasyProviderFactory.java:473)
at org.jboss.resteasy.plugins.providers.RegisterBuiltin.registerProviders(RegisterBuiltin.java:70)
at org.jboss.resteasy.plugins.providers.RegisterBuiltin.register(RegisterBuiltin.java:31)
... 13 more

Can't propose any fix for this because the ConcurrentModificationException is thrown in iterator "for (InterceptorRegistryListener listener : listeners)", but, sadly, :"listeners" is available to anyone outside the class via getListeners(), so you should change listeners to any concurrency-resistant impl or check all other sources to make all changed to listeners synchronized.