java.util.ConcurrentModificationException while Inserting the values in arrayList [duplicate]

Question

javax.faces.FacesException: #{scheduleBean.insert()}: java.util.ConcurrentModificationException
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Caused by: javax.faces.el.EvaluationException: java.util.ConcurrentModificationException

Code:

 public void insert(){

       for(ScheduleMaster v:arrayList1){

           arrayList1.add(mm.i, v); 
       }           
       List<ScheduleMaster>temp1=new ArrayList<ScheduleMaster>();
       temp1=arrayList1;
       System.out.println("Coming Insert");
       Iterator<ScheduleMaster>itr=temp1.iterator();
         while(itr.hasNext()){
             ScheduleMaster s=itr.next();
             s.setServiceCode(serviceCode);
             s.setServiceName(serviceName);
             s.setVessalCode(vessalCode);
             s.setVessalName(vessalName);
             s.setVoyage(voyage);
             s.setPortCode(portCode);
             s.setPortName(portName);
             s.setTerminalCode(terminalCode);
             s.setTerminalName(terminalName);
             s.setEta(eta);
             s.setEtaTimes(etaTimes);
             s.setEtd(etd);
             s.setEtdTimes(etdTimes);
             s.setBound(bound);
             s.setAta(ata);
             s.setAtaTimes(ataTimes);
             s.setAtd(atd);
             s.setAtdTimes(atdTimes);
             arrayList1.add(s);                        

       } 

   }

This is not a well defined question, only a stacktrace and a code snippet. And also it seems a duplicate question. — Ricardo Vila
– Ricardo Vila, Commented Aug 12, 2015 at 7:53

Jens · Accepted Answer · 2015-08-12 07:05:50Z

2

temp1 and arrayList1 is the reference to the same object. And you cannot iterate over an object and change it while iteration.

So you have to clone the object and then you can iterate over the clone and change the original.

  List<ScheduleMaster>temp1=new ArrayList<ScheduleMaster>();
  for(ScheduleMaster v:arrayList1){

       arrayList1.add(mm.i, v); 
       temp1.add(mm.i, v); 
   }

answered Aug 12, 2015 at 7:05

Jens

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