[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-4021) ArrayIndexOutOfBoundsException in SessionContext.getNames() when concurrent access from same user

ArrayIndexOutOfBoundsException in SessionContext.getNames() when concurrent access from same user ------------------------------------------------------------------------------------------------- Key: JBSEAM-4021 URL: https://jira.jboss.org/jira/browse/JBSEAM-4021 Project: Seam Issue Type: Bug Components: Core Affects Versions: 2.1.1.GA Reporter: Takayoshi Kimura ArrayIndexOutOfBoundsException in SessionContext.getNames() when concurrent access from same user The SessionContext.getNames() calls super.getNames() and the BasicContext.getNames() does the following: public String[] getNames() { //yes, I know about the toArray() method, //but there is a bug in the RI! Set<String> keySet = map.keySet(); String[] array = new String[ keySet.size() ]; int i=0; for (String key: keySet) { array[i++] = key; } return array; } An ArrayIndexOutOfBoundsException (and possibly a ConcurrentModificationException) could be thrown when an entry is added to the session map during iteration, after the keySet.size() call. The FacesLifecycle uses the ExternalContext.getSessionMap() for SessionContext internal data. This map is directly tied with HttpSession and it reflects changes on the HttpSession from other threads immediately. This problem doesn't happen with ServletLifecycle because it uses ServletRequestMap class for internal data and this class always creates new instance per keySet() call. The keySet from this map won't be changed during iteration. This problem happends regardless of debug mode. 2009-02-17 16:10:05,699 ERROR [org.jboss.seam.jsf.SeamPhaseListener] uncaught exception java.lang.ArrayIndexOutOfBoundsException: 35 at org.jboss.seam.contexts.BasicContext.getNames(BasicContext.java:60) at org.jboss.seam.contexts.SessionContext.getNames(SessionContext.java:34) at org.jboss.seam.contexts.SessionContext.flush(SessionContext.java:47) at org.jboss.seam.contexts.Contexts.flushAndDestroyContexts(Contexts.java:385) at org.jboss.seam.contexts.FacesLifecycle.endRequest(FacesLifecycle.java:112) at org.jboss.seam.jsf.SeamPhaseListener.afterResponseComplete(SeamPhaseListener.java:524) at org.jboss.seam.jsf.SeamPhaseListener.afterServletPhase(SeamPhaseListener.java:249) at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:192) at com.sun.faces.lifecycle.Phase.handleAfterPhase(Phase.java:175) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:114) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265) 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$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85) at org.jboss.seam.servlet.SeamFilter$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:141) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281) 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:182) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:543) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:437) at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:381) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:595)