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. 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