Is it even possible to use memcache with GWT on the server side? I am
wondering if I am even able to do this?
On Feb 1, 1:56 pm, chiappone <chiapp...@gmail.com> wrote:
> 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.seriali
> zeWithCustomSerializer
> (ServerSerializationStreamWriter.java:760)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeImpl
> (ServerSerializationStreamWriter.java:723)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali ze
> (ServerSerializationStreamWriter.java:612)
> at
> com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write
> Object
> (AbstractSerializationStreamWriter.java:129)
> at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
> $ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeValue
> (ServerSerializationStreamWriter.java:534)
> at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:609)
> at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess
> (RPC.java:467)
> at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse
> (RPC.java:564)
> at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall
> (RemoteServiceServlet.java:188)
> at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost
> (RemoteServiceServlet.java:224)
> at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost
> (AbstractRemoteServiceServlet.java:62)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
> 487)
> at org.mortbay.jetty.servlet.ServletHandler$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.seriali
> zeWithCustomSerializer
> (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.seriali
> zeWithCustomSerializer
> (ServerSerializationStreamWriter.java:760)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeImpl
> (ServerSerializationStreamWriter.java:723)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali ze
> (ServerSerializationStreamWriter.java:612)
> at
> com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write
> Object
> (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.seriali
> zeValue
> (ServerSerializationStreamWriter.java:534)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeClass
> (ServerSerializationStreamWriter.java:700)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeImpl
> (ServerSerializationStreamWriter.java:730)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeClass
> (ServerSerializationStreamWriter.java:712)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeImpl
> (ServerSerializationStreamWriter.java:730)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeClass
> (ServerSerializationStreamWriter.java:712)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeImpl
> (ServerSerializationStreamWriter.java:730)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeClass
> (ServerSerializationStreamWriter.java:712)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> zeImpl
> (ServerSerializationStreamWriter.java:730)
> at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali ze
> (ServerSerializationStreamWriter.java:612)
> at
> com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write
> Object
> (AbstractSerializationStreamWriter.java:129)
> at
> com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSeriali
> zerBase.serialize
> (Collection_CustomFieldSerializerBase.java:43)
> at
> com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializ
> er.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.seriali
> zeWithCustomSerializer
> (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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