ConcurrentModificationException While not under load
nathandennis Apr 11, 2008 1:34 AMHaving trouble with an exception just after ajax call.
jboss 4.2.2
seam 2.0.1.ga
richfaces 3.2
the expection
19:04:00,004 ERROR [SeamPhaseListener] uncaught exception java.util.ConcurrentModificationException at java.util.SubList.checkForComodification(AbstractList.java:855) at java.util.SubList.size(AbstractList.java:728) at org.jboss.seam.contexts.EntityBeanList.passivateAll(EntityBeanList.java:68) at org.jboss.seam.contexts.AbstractEntityBeanCollection.passivate(AbstractEntityBeanCollection.java:43) at org.jboss.seam.contexts.ServerConversationContext.isAttributeDirty(ServerConversationContext.java:307) at org.jboss.seam.contexts.ServerConversationContext.flush(ServerConversationContext.java:280) at org.jboss.seam.contexts.Contexts.flushAndDestroyContexts(Contexts.java:371) at org.jboss.seam.contexts.FacesLifecycle.endRequest(FacesLifecycle.java:112) at org.jboss.seam.jsf.SeamPhaseListener.afterRenderResponse(SeamPhaseListener.java:502) at org.jboss.seam.jsf.SeamPhaseListener.afterServletPhase(SeamPhaseListener.java:235) at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:182) at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:280) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:147) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276) at org.ajax4jsf.Filter.doFilter(Filter.java:175) at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) at java.lang.Thread.run(Thread.java:595) 19:04:00,006 ERROR [SeamPhaseListener] swallowing exception java.util.ConcurrentModificationException at java.util.SubList.checkForComodification(AbstractList.java:855) at java.util.SubList.size(AbstractList.java:728) at org.jboss.seam.contexts.EntityBeanList.passivateAll(EntityBeanList.java:68) at org.jboss.seam.contexts.AbstractEntityBeanCollection.passivate(AbstractEntityBeanCollection.java:43) at org.jboss.seam.contexts.ServerConversationContext.isAttributeDirty(ServerConversationContext.java:307) at org.jboss.seam.contexts.ServerConversationContext.flush(ServerConversationContext.java:280) at org.jboss.seam.contexts.Contexts.flushAndDestroyContexts(Contexts.java:371) at org.jboss.seam.contexts.FacesLifecycle.endRequest(FacesLifecycle.java:112) at org.jboss.seam.jsf.SeamPhaseListener.afterRenderResponse(SeamPhaseListener.java:502) at org.jboss.seam.jsf.SeamPhaseListener.afterServletPhase(SeamPhaseListener.java:235) at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:182) at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:280) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:147) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276) at org.ajax4jsf.Filter.doFilter(Filter.java:175) at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) at java.lang.Thread.run(Thread.java:595)
there are a bunch of ajax request on this page.. and this two are the only ones giving trouble.
now some code.
@Stateful @Name("picAction") @Scope(ScopeType.CONVERSATION) public class PicAction implements PicLocal, DropListener, Serializable .... public void switchLayer(boolean layer, int layerindex){ if (layer == false && this.layerselectlock==false && this.activelayer >= 0){ saveOrder(); if(activelayer < layerframe2.size() -1 ){ subreindex = layerframe2.subList(activelayer + 1, layerframe2.size()); long startingpoint = subreindex.get(0).getPoz(); log.info("after sublist"); for(int i = 0; i < subreindex.size(); i++ ){ subreindex.get(i).setPoz(startingpoint - (long)1 + (long)i ); entityManager.merge(subreindex.get(i)); } if(layerframe2.get(activelayer).getMark() == 107){ FileDeleteLocal removelayer = (FileDeleteLocal) Component.getInstance("fileDeleteAction"); removelayer.deleteMedia(layerframe2.get(activelayer).getLayername(), layerframe2.get(activelayer).getUserid()); }else { entityManager.remove(entityManage .find(Layers.class, layerframe2.get(activelayer).getId())); } layerselectlock = true; initEdit(); //reinitialize list }....
function deleteLayerTrash( cid ){ document.getElementById('ajaxdisabled').style.visibility='visible'; Seam.Remoting.getContext().setConversationId( cid ); Seam.Component.getInstance("removeLayerAction").removeLayer(false, rerenderSideBar); }
onclick="deleteLayerTrash( #{conversation.id} )"
this quantity of code may be worthless.. this app is so large... it is becoming cumbersome.
The first time this is executed it works fine. It will throw the exception on the second or third execution WITHOUT FAIL.
any direction would be greatly appreciated.