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
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