Re: GWT 2.0 RC1 deRPC fails on App Engine?

[Kabe]

Anyone with any insight into this? has anyone gotten deRPC to work on AppEngine?

On Wed, Nov 18, 2009 at 9:01 PM, Kabe <kab...@robichaux.com> wrote:

I'm trying to use deRPC of GWT 2.0 RC1 on App Engine and i'm getting
the following exception. Is this because sun.misc.Unsafe is
unavailable on App Engine (i'm not sure it isn't, but it seems
possible)? Seems strange that GWT 2.0 RPC would not work on App
Engine. Did i fail to configure something correctly or is this an
intended incompatibility with App Engine?



javax.servlet.ServletContext log: Exception while dispatching incoming
RPC call
java.lang.ExceptionInInitializerError
       at com.google.gwt.rpc.server.RPC.decodeRequest(RPC.java:158)
       at com.google.gwt.rpc.server.RpcServlet.processCall(RpcServlet.java:
141)
       at com.google.gwt.rpc.server.RpcServlet.processPost(RpcServlet.java:
203)
       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$CachedChain.doFilter
(ServletHandler.java:1093)
       at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter
(SaveSessionFilter.java:35)
       at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
       at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
       at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
       at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
       at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
       at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
       at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
       at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
       at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle
(AppVersionHandlerMap.java:238)
       at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
       at org.mortbay.jetty.Server.handle(Server.java:313)
       at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
       at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete
(HttpConnection.java:830)
       at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable
(RpcRequestParser.java:76)
       at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
       at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest
(JettyServletEngineAdapter.java:139)
       at com.google.apphosting.runtime.JavaRuntime.handleRequest
(JavaRuntime.java:239)
       at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:5135)
       at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:5133)
       at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest
(BlockingApplicationHandler.java:24)
       at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
363)
       at com.google.net.rpc.impl.Server$2.run(Server.java:814)
       at com.google.tracing.LocalTraceSpanRunnable.run
(LocalTraceSpanRunnable.java:56)
       at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan
(LocalTraceSpanBuilder.java:516)
       at com.google.net.rpc.impl.Server.startRpc(Server.java:769)
       at com.google.net.rpc.impl.Server.processRequest(Server.java:351)
       at com.google.net.rpc.impl.ServerConnection.messageReceived
(ServerConnection.java:437)
       at com.google.net.rpc.impl.RpcConnection.parseMessages
(RpcConnection.java:319)
       at com.google.net.rpc.impl.RpcConnection.dataReceived
(RpcConnection.java:290)
       at com.google.net.async.Connection.handleReadEvent(Connection.java:
436)
       at com.google.net.async.EventDispatcher.processNetworkEvents
(EventDispatcher.java:762)
       at com.google.net.async.EventDispatcher.internalLoop
(EventDispatcher.java:207)
       at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:
101)
       at com.google.net.rpc.RpcService.runUntilServerShutdown
(RpcService.java:251)
       at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run
(JavaRuntime.java:396)
       at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Unable to get Unsafe instance
       at com.google.gwt.rpc.server.CommandSerializationUtil.<clinit>
(CommandSerializationUtil.java:443)
       ... 45 more
Caused by: java.lang.NoSuchFieldException: theUnsafe
       at com.google.appengine.runtime.Request.process-c17519ba124c1455
(Request.java)
       at java.lang.Class.getDeclaredField(Class.java:158)
       at com.google.gwt.rpc.server.CommandSerializationUtil.<clinit>
(CommandSerializationUtil.java:430)
       ... 45 more

[Kabe]

Maybe i should ask, has anyone been able to get GWT 2.0 RC1 deRPC to work with App Engine? I couldn't, but maybe i did something wrong so i would love to hear if someone got it working.

....

Kabe

[Kabe]

[Tristan]

Don't know if it is the same problem.. but are you initializing GAE to
run in your application configuration? I couldn't get server side to
work because when configuring a custom Java Application Configuration,
since Web Application doesn't work with GWT 2.0 because it is now
DevMode and not HostedMode. To get GAE up, we need to pass a "-server"
argument so that GAE runs instead of plain old Jetty. I haven't gotten
an answer from anyone what that -server argument should be.

Tristan

[Tristan]

in case this is the problem, the -server argument is:

-server com.google.appengine.tools.development.gwt.AppEngineLauncher

[Kabe]

This still doesn't work. I can't use the new RPC system in GWT 2.0 with AppEngine. I would love to get an idea if this is intended, and the new RPC system will not work with AppEngine, or if this is a bug that can be filed/tracked.

....

Kabe

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[Chris Ramsdale]

You can track progress on this issue here: http://code.google.com/p/google-web-toolkit/issues/detail?id=4185

App Engine deRPC support will be available in a post 2.0 release.

[Kabe]

Great, thanks for the issue i can follow!