Re: Getting ConcurrentModificationException

Observed same exception with GWT 2.4.0 and GWT 2.5.1 as well.

Only stack trace is changed with GWT GWT 2.4.0 and GWT 2.5.1.

New stack trace:

java.util.ConcurrentModificationException: null

at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839) ~[na:1.7.0_17]

at java.util.HashMap$EntryIterator.next(HashMap.java:880) ~[na:1.7.0_17]

at java.util.HashMap$EntryIterator.next(HashMap.java:878) ~[na:1.7.0_17]

at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.serialize(Map_CustomFieldSerializerBase.java:51) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serialize(HashMap_CustomFieldSerializer.java:39) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serializeInstance(HashMap_CustomFieldSerializer.java:51) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serializeInstance(HashMap_CustomFieldSerializer.java:28) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:788) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:587) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:757) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:769) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:769) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:769) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:769) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:587) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:757) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.serialize(Map_CustomFieldSerializerBase.java:53) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serialize(HashMap_CustomFieldSerializer.java:39) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serializeInstance(HashMap_CustomFieldSerializer.java:51) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serializeInstance(HashMap_CustomFieldSerializer.java:28) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:788) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:587) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:757) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:769) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:769) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:587) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:757) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:796) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:44) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:39) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serializeInstance(ArrayList_CustomFieldSerializer.java:51) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serializeInstance(ArrayList_CustomFieldSerializer.java:28) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:788) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:587) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:605) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:471) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:563) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) ~[gwt-servlet.jar:na]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) [servlet-api.jar:na]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) [servlet-api.jar:na]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) [catalina.jar:7.0.19]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.19]

at com.ericsson.wifi.web.filter.CacheControlFilter.doFilter(CacheControlFilter.java:45) [CacheControlFilter.class:na]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [catalina.jar:7.0.19]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) [catalina.jar:7.0.19]

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) [catalina.jar:7.0.19]

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) [catalina.jar:7.0.19]

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) [catalina.jar:7.0.19]

at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:257) [tomcat-coyote.jar:7.0.19]

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) [tomcat-coyote.jar:7.0.19]

at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1764) [tomcat-coyote.jar:7.0.19]

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.7.0_17]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.7.0_17]

at java.lang.Thread.run(Unknown Source) [na:1.7.0_17]

On Thursday, November 21, 2013 12:16:38 PM UTC+5:30, Vikas wrote:

Hi All,

I'm getting ConcurrentModificationException randomly with GWT 2.2.0.

Stack trace:

ERROR org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/] 185 Exception while dispatching incoming RPC call

com.google.gwt.user.client.rpc.SerializationException: java.lang.reflect.InvocationTargetException

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:764) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:727) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:474) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:571) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) ~[gwt-servlet.jar:na]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) [servlet-api.jar:na]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) [servlet-api.jar:na]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) [catalina.jar:7.0.19]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.19]

at com.ericsson.wifi.web.filter.CacheControlFilter.doFilter(CacheControlFilter.java:45) [CacheControlFilter.class:na]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [catalina.jar:7.0.19]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) [catalina.jar:7.0.19]

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) [catalina.jar:7.0.19]

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) [catalina.jar:7.0.19]

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) [catalina.jar:7.0.19]

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) [catalina.jar:7.0.19]

at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:257) [tomcat-coyote.jar:7.0.19]

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) [tomcat-coyote.jar:7.0.19]

at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1764) [tomcat-coyote.jar:7.0.19]

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.7.0_17]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.7.0_17]

at java.lang.Thread.run(Unknown Source) [na:1.7.0_17]

Caused by: java.lang.reflect.InvocationTargetException: null

at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source) ~[na:na]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_17]

at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_17]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:746) ~[gwt-servlet.jar:na]

... 31 common frames omitted

Caused by: com.google.gwt.user.client.rpc.SerializationException: java.lang.reflect.InvocationTargetException

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:764) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:727) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:704) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:716) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:716) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:704) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:45) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:38) ~[gwt-servlet.jar:na]

... 35 common frames omitted

Caused by: java.lang.reflect.InvocationTargetException: null

at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) ~[na:na]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_17]

at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_17]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:746) ~[gwt-servlet.jar:na]

... 56 common frames omitted

Caused by: com.google.gwt.user.client.rpc.SerializationException: java.lang.reflect.InvocationTargetException

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:764) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:727) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:704) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:716) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:716) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:716) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:716) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:704) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:734) ~[gwt-servlet.jar:na]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:616) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.serialize(Map_CustomFieldSerializerBase.java:52) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serialize(HashMap_CustomFieldSerializer.java:38) ~[gwt-servlet.jar:na]

... 60 common frames omitted

Caused by: java.lang.reflect.InvocationTargetException: null

at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) ~[na:na]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_17]

at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_17]

at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:746) ~[gwt-servlet.jar:na]

... 85 common frames omitted

Caused by: java.util.ConcurrentModificationException: null

at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839) ~[na:1.7.0_17]

at java.util.HashMap$EntryIterator.next(HashMap.java:880) ~[na:1.7.0_17]

at java.util.HashMap$EntryIterator.next(HashMap.java:878) ~[na:1.7.0_17]

at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.serialize(Map_CustomFieldSerializerBase.java:50) ~[gwt-servlet.jar:na]

at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serialize(HashMap_CustomFieldSerializer.java:38) ~[gwt-servlet.jar:na]

... 89 common frames omitted

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