IOException while calling createNewGSFile() in servlet - google-app-engine

Question

I am getting an IOException while trying to write to the Google store
The stack trace is attached
java.io.IOException
at com.google.appengine.api.files.FileServiceImpl.translateException(FileServiceImpl.java:601)
at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:574)
at com.google.appengine.api.files.FileServiceImpl.create(FileServiceImpl.java:481)
at com.google.appengine.api.files.FileServiceImpl.createNewGSFile(FileServiceImpl.java:151)
at guestbook.StoreFileServlet.Insert(StoreFileServlet.java:106)
at guestbook.StoreFileServlet.doPost(StoreFileServlet.java:76)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
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:249)
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$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:446)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
at java.lang.Thread.run(Thread.java:679)
Caused by: com.google.apphosting.api.ApiProxy$ApplicationException: ApplicationError: 8:
at java.lang.Thread.getStackTrace(Thread.java:1495)
at com.google.apphosting.runtime.ApiProxyImpl.doSyncCall(ApiProxyImpl.java:237)
at com.google.apphosting.runtime.ApiProxyImpl.access$000(ApiProxyImpl.java:68)
at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:182)
at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:180)
at java.security.AccessController.doPrivileged(Native Method)
at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:180)
at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:68)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:101)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:50)
at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:570)
... 36 more
Caused by: com.google.apphosting.api.ApiProxy$ApplicationException: ApplicationError: 8:
at com.google.apphosting.runtime.ApiProxyImpl$AsyncApiFuture.failure(ApiProxyImpl.java:546)
at com.google.net.rpc3.client.RpcStub$RpcCallbackDispatcher$1.runInContext(RpcStub.java:788)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
at com.google.net.rpc3.client.RpcStub$RpcCallbackDispatcher.rpcFinished(RpcStub.java:828)
at com.google.net.rpc3.client.RpcStub$RpcCallbackDispatcher.failure(RpcStub.java:819)
at com.google.net.rpc3.impl.client.RpcClientInternalContext.runCallbacks(RpcClientInternalContext.java:906)
at com.google.net.rpc3.impl.client.RpcClientInternalContext.finishRpcAndNotifyApp(RpcClientInternalContext.java:809)
at com.google.net.rpc3.impl.client.RpcNetChannel.afterFinishingActiveRpc(RpcNetChannel.java:1062)
at com.google.net.rpc3.impl.client.RpcNetChannel.finishRpc(RpcNetChannel.java:908)
at com.google.net.rpc3.impl.client.RpcNetChannel.handleResponse(RpcNetChannel.java:2265)
at com.google.net.rpc3.impl.client.RpcNetChannel.messageReceived(RpcNetChannel.java:2077)
at com.google.net.rpc3.impl.client.RpcNetChannel.access$2000(RpcNetChannel.java:147)
at com.google.net.rpc3.impl.client.RpcNetChannel$TransportCallback.receivedMessage(RpcNetChannel.java:3115)
at com.google.net.rpc3.impl.client.RpcChannelTransportData$TransportCallback.receivedMessage(RpcChannelTransportData.java:602)
at com.google.net.rpc3.impl.wire.RpcBaseTransport.receivedMessage(RpcBaseTransport.java:420)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport.parseOneMessage(RpcClientTcpTransport.java:773)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport.parseMessages(RpcClientTcpTransport.java:651)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport.access$100(RpcClientTcpTransport.java:38)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport$1.dataReceived(RpcClientTcpTransport.java:293)
at com.google.net.async3.SocketConnection.handleNetworkReadEvent(SocketConnection.java:843)
at com.google.net.async3.SocketConnection.access$400(SocketConnection.java:40)
at com.google.net.async3.SocketConnection$NetworkReadHandlerImpl.run(SocketConnection.java:872)
at com.google.net.eventmanager.AbstractFutureTask$Sync.innerRun(AbstractFutureTask.java:260)
at com.google.net.eventmanager.AbstractFutureTask.run(AbstractFutureTask.java:121)
at com.google.net.eventmanager.EventManagerImpl.runTask(EventManagerImpl.java:576)
at com.google.net.eventmanager.EventManagerImpl.internalRunWorkerLoop(EventManagerImpl.java:997)
at com.google.net.eventmanager.EventManagerImpl.runWorkerLoop(EventManagerImpl.java:878)
at com.google.net.eventmanager.WorkerThreadInfo.runWorkerLoop(WorkerThreadInfo.java:134)
at com.google.net.eventmanager.EventManagerImpl$WorkerThread.run(EventManagerImpl.java:1833)
The code ia as follows
FileService fileService = FileServiceFactory.getFileService();
GSFileOptionsBuilder optionsBuilder = new GSFileOptionsBuilder()
.setBucket("mybucket")
.setKey(key)
.setMimeType("text/html")
.setAcl("public-read")
.addUserMetadata("myfield1", "my field value");
try {
AppEngineFile writableFile = fileService.createNewGSFile(optionsBuilder.build());
// Open a channel for writing
boolean lockForWrite = false;
FileWriteChannel writeChannel = fileService.openWriteChannel(writableFile, lockForWrite);
PrintWriter out = new PrintWriter(Channels.newWriter(writeChannel, "UTF8"));
out.println(value);
out.close();
writeChannel.closeFinally();
} catch (IOException e) {
// TODO Auto-generated catch block
}
I am using App Engine SDK 1.6.4
Thanks

Answer 1

This is solved. It is the typical impatient newbie problem :)
What I had not done was give my app permission to the Google cloud storage project [which I missed].
See pre-requisite 5 at
https://developers.google.com/appengine/docs/java/googlestorage/overview

Answer 2

I solved this by using App Engine SDK 1.7 instead of 1.6.3.1( which cause the problem )
Nothing change in the my code. Just change App Engine SDK version to 1.7.