java.lang.VerifyError, When Writing Files to the Blobstore (Experimental)

[Simon-Pierre Gingras]

Hi everyone,

I've been testing the sample code found at http://code.google.com/appengine/docs/java/blobstore/overview.html#Writing_Files_to_the_Blobstore , but somehow i'm having a runtime exception.

As you can see from the code below, i've only implemented the first two lines of the sample code:

// ===========  BlobStoreExperiment.java ===========

import java.io.IOException;

import com.google.appengine.api.files.AppEngineFile;

import com.google.appengine.api.files.FileService;

import com.google.appengine.api.files.FileServiceFactory;

public class BlobStoreExperiment {

  public static void writeImageToBlobStore() throws IOException {

    

    // Get a file service

    FileService fileService = FileServiceFactory.getFileService();

    // Create a new Blob file with mime-type "text/plain"

    AppEngineFile file = fileService.createNewBlobFile("text/plain"); // <--------- Exception thrown on this line

  }

}

============ Runtime error stacktrace ===================

[ERROR] javax.servlet.ServletContext log: Exception while dispatching incoming RPC call

com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract com.gwtplatform.dispatch.shared.Result com.gwtplatform.dispatch.shared.DispatchService.execute(java.lang.String,com.gwtplatform.dispatch.shared.Action) throws com.gwtplatform.dispatch.shared.ActionException,com.gwtplatform.dispatch.shared.ServiceException' threw an unexpected exception: java.lang.VerifyError: class com.google.appengine.api.files.FileServicePb$CreateRequest overrides final method getUnknownFields.()Lcom/google/appengine/repackaged/com/google/protobuf/UnknownFieldSet;

at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385)

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:588)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)

at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)

at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)

at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)

at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)

at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)

at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)

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 com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)

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.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)

at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)

at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:351)

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.content(HttpConnection.java:938)

at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)

at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)

at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)

at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

Caused by: java.lang.VerifyError: class com.google.appengine.api.files.FileServicePb$CreateRequest overrides final method getUnknownFields.()Lcom/google/appengine/repackaged/com/google/protobuf/UnknownFieldSet;

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(Unknown Source)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$000(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)

at java.lang.ClassLoader.loadClass(Unknown Source)

at com.google.appengine.api.files.FileServiceImpl.create(FileServiceImpl.java:383)

at com.google.appengine.api.files.FileServiceImpl.createNewBlobFile(FileServiceImpl.java:87)

at com.google.appengine.api.files.FileServiceImpl.createNewBlobFile(FileServiceImpl.java:69)

at com.quebecpass.web.server.admin.BlobStoreExperiment.writeImageToBlobStore(BlobStoreExperiment.java:22)

at com.quebecpass.web.server.admin.UploadImageHandler.execute(UploadImageHandler.java:30)

at com.quebecpass.web.server.admin.UploadImageHandler.execute(UploadImageHandler.java:1)

at com.gwtplatform.dispatch.server.AbstractDispatchImpl.doExecute(AbstractDispatchImpl.java:153)

at com.gwtplatform.dispatch.server.AbstractDispatchImpl.execute(AbstractDispatchImpl.java:111)

at com.gwtplatform.dispatch.server.AbstractDispatchServiceImpl.execute(AbstractDispatchServiceImpl.java:80)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100)

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)

... 39 more

As you can see, the thrown exception is java.lang.VerifyError: class com.google.appengine.api.files.FileServicePb$CreateRequest overrides final method getUnknownFields .

Could someone help me understand why this exception is thrown and/or how to overcome this issue?

Thanks in advance!

Simon-Pierre, Canada

[Ikai Lan (Google)]

What version of the SDK are you using? I assume you're doing this locally?

This works fine for me - I just tried running the code you sent:

FileService fileService = FileServiceFactory.getFileService();

AppEngineFile file = fileService.createNewBlobFile("text/plain");

No errors in a servlet.

--

Ikai Lan 
Developer Programs Engineer, Google App Engine

plus.ikailan.com | twitter.com/ikai

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