I have hit the wall in trying to figure out what I am doing wrong in
my GAE GWT application. I am trying to use memcache to get a list of
serializable objects out of the cache in a service. It seems to put
them fine, and I can see them being pulled from cache in the debugger
but I end up getting the following exception:
This is the call to pull the object out of cache:
List<Model> ecDevices = (List<Model>) cache.findInCache(partitionKey);
if(ecDevices != null && ecDevices.size() > 0){
log.info("Returning devices from cache");
return ecDevices;
}...
SEVERE: [1265057364142000] javax.servlet.ServletContext log: 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:760)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:723)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:612)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue
(ServerSerializationStreamWriter.java:534)
at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:609)
at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess
(RPC.java:467)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse
(RPC.java:564)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall
(RemoteServiceServlet.java:188)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost
(RemoteServiceServlet.java:224)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost
(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter
(ServeBlobFilter.java:51)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at com.google.appengine.tools.development.StaticFileFilter.doFilter
(StaticFileFilter.java:121)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle
(DevAppEngineWebAppContext.java:70)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
at org.mortbay.jetty.HttpConnection$RequestHandler.content
(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run
(SelectChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run
(BoundedThreadPool.java:442)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke
(Runtime.java:100)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer
(ServerSerializationStreamWriter.java:742)
... 38 more
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:760)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:723)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:612)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue
(ServerSerializationStreamWriter.java:534)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass
(ServerSerializationStreamWriter.java:700)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:730)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass
(ServerSerializationStreamWriter.java:712)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:730)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass
(ServerSerializationStreamWriter.java:712)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:730)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass
(ServerSerializationStreamWriter.java:712)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:730)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:612)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
at
com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize
(Collection_CustomFieldSerializerBase.java:43)
at
com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize
(ArrayList_CustomFieldSerializer.java:36)
... 44 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke
(Runtime.java:100)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer
(ServerSerializationStreamWriter.java:742)
... 61 more
Caused by: java.lang.NullPointerException
at com.extjs.gxt.ui.client.data.RpcMap.size(RpcMap.java:198)
at com.extjs.gxt.ui.client.data.RpcMap_CustomFieldSerializer.serialize
(RpcMap_CustomFieldSerializer.java:32)
... 67 more
error: com.google.gwt.user.client.rpc.StatusCodeException: The call
failed on the server; see server log for details
Any ideas would be greatly appreciated. Thanks.
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