You need to make sure that the class implements the
java.io.Serializable interface. There are no methods to this
interface:
class MyClass implements java.io.Serializable {
}
Stephen
On Tue, May 17, 2011 at 4:39 PM, Steve Fisher <[email protected]> wrote:
> I have a small application (using GWT) which was working fine on my own
> machine but gives problems when I deploy it on GAE. I get a message about
> a NotSerializableException for a class defined as a public inner class of a
> another class on the server side. Instances of this class are associated
> with a session on the server by:
>
> HttpServletRequest req = this.getThreadLocalRequest();
>
> HttpSession sess = req.getSession();
>
> UserInfo ui = (UserInfo) sess.getAttribute("UserInfo");
>
> The rest of this message is the traceback. Any ideas please?
> Steve
> ---------------------------------------------------------
> java.lang.RuntimeException: java.io.NotSerializableException:
> uk.org.harwellcroquet.server.LoginServiceImpl$UserInfo
>
> at
> com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:393)
> at
> com.google.apphosting.runtime.jetty.SessionManager.createEntityForSession(SessionManager.java:370)
> at
> com.google.apphosting.runtime.jetty.SessionManager$AppEngineSession.save(SessionManager.java:164)
> at
> com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:41)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
> at
> com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
> at
> com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:326)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
> at
> com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> at
> com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
> at
> com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:260)
> at
> com.google.apphosting.base.RuntimePb$EvaluationRuntime$2.handleRequest(RuntimePb.java:9669)
> at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:439)
> at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:573)
> at
> com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:448)
> at com.google.tracing.TraceContext.runInContext(TraceContext.java:688)
> at
> com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:326)
> at
> com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:318)
> at
> com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:446)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> at java.lang.Thread.run(Thread.java:636)
> Caused by: java.io.NotSerializableException:
> uk.org.harwellcroquet.server.LoginServiceImpl$UserInfo
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1173)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:343)
> at java.util.HashMap.writeObject(HashMap.java:1018)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:616)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:962)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1478)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1409)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1167)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:343)
> at
> com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:390)
> ... 31 more
>
> --
> You received this message because you are subscribed to the Google Groups
> "Google App Engine" group.
> To post to this group, send email to [email protected].
> To unsubscribe from this group, send email to
> [email protected].
> For more options, visit this group at
> http://groups.google.com/group/google-appengine?hl=en.
>
--
You received this message because you are subscribed to the Google Groups
"Google App Engine" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-appengine?hl=en.
