I am building a GWT-GAE-Java application that imports Google Contacts
using the GData Java Client library. I am following this example
here: http://code.google.com/apis/gdata/docs/auth/oauth.html
I am attempting the first stage of this demo where I create a URL the
user gets redirected to to authenticate my application to extract
contact data.
The problem is I can't get it to work. My code is running on the
server section of the GWT application, and it fails on the first line
where the GoogleOAuthParameters is initialized with a
"NoClassDefFoundError".
I have tried changing this every which way and I am pulling my
proverbial hair out.
I recognize that there is a GWT-Client library for managing this
process from the client side of GWT, but I don't want to use that as
it doesn't use oAuth.
Any ideas?
Cheers
Gene
**** CODE
GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
oauthParameters.setOAuthConsumerKey(CONSUMER_KEY);
oauthParameters.setOAuthConsumerSecret(CONSUMER_SECRET);
oauthParameters.setScope("https://docs.google.com/feeds/";);
oauthParameters.setOAuthCallback("http://www.example.com/
UpgradeToken.jsp");
GoogleOAuthHelper oauthHelper = new GoogleOAuthHelper(new
OAuthHmacSha1Signer());
oauthHelper.getUnauthorizedRequestToken(oauthParameters);
String approvalPageUrl =
oauthHelper.createUserAuthorizationUrl(oauthParameters);
System.out.println(approvalPageUrl);
*****ERROR
Jun 8, 2010 2:56:52 PM
com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: [1276034212868000] javax.servlet.ServletContext log: Exception
while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract com.sohoappspot.scheduler.shared.UserInfo
com.sohoappspot.scheduler.client.rpc.GreetingService.getUserInformation()
throws java.lang.IllegalArgumentException' threw an unexpected
exception: java.lang.NoClassDefFoundError: com/google/gdata/client/
authn/oauth/GoogleOAuthParameters
at
com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
378)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
581)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
188)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
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:
511)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
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
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:349)
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.NoClassDefFoundError: com/google/gdata/client/
authn/oauth/GoogleOAuthParameters
at
com.sohoappspot.scheduler.server.GreetingServiceImpl.getContactsAuthSubLogin(GreetingServiceImpl.java:
96)
at
com.sohoappspot.scheduler.server.GreetingServiceImpl.getUserInformation(GreetingServiceImpl.java:
78)
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
com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
100)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
562)
... 30 more
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