I'm getting this exception trying to use GAE to login in my local
environment.
java.lang.NullPointerException
at
com.google.appengine.api.users.dev.LoginCookieUtils.encodeEmailAsUserId(LoginCookieUtils.java:
89)
at
com.google.appengine.api.users.dev.LoginCookieUtils.createCookie(LoginCookieUtils.java:
41)
at
com.google.appengine.api.users.dev.LocalLoginServlet.doPost(LocalLoginServlet.java:
90)
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.handle(ServletHandler.java:
362)
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.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:268)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at
net.sourceforge.stripes.action.ForwardResolution.execute(ForwardResolution.java:
110)
at net.sourceforge.stripes.controller.DispatcherHelper
$7.intercept(DispatcherHelper.java:508)
at
net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:
158)
at
net.sourceforge.stripes.controller.HttpCacheInterceptor.intercept(HttpCacheInterceptor.java:
99)
at
net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:
155)
at
net.sourceforge.stripes.controller.BeforeAfterMethodInterceptor.intercept(BeforeAfterMethodInterceptor.java:
113)
at
net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:
155)
at
net.sourceforge.stripes.controller.ExecutionContext.wrap(ExecutionContext.java:
74)
at
net.sourceforge.stripes.controller.DispatcherHelper.executeResolution(DispatcherHelper.java:
502)
at
net.sourceforge.stripes.controller.DispatcherServlet.executeResolution(DispatcherServlet.java:
286)
at
net.sourceforge.stripes.controller.DispatcherServlet.service(DispatcherServlet.java:
170)
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
net.sourceforge.stripes.controller.StripesFilter.doFilter(StripesFilter.java:
247)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
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
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
121)
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.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
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.content(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
I'm using stripes, and I only get this in one particular action while
forwarding the the url returned by userService.createLoginURL(). I've
created a separate test action, which will forward to the login page
just fine. I can't quite figure out what my code is doing to cause a
null pointer in the GAE code.
My default handler does these particular things before returning a
forward resolution to the login url.
1. get session
2. get request's content type and content.
3. store some data in the session
4. if user isn't logged in (userService.isUserLoggedIn()) return a
ForwardResolution to the url generated by createLoginURL(). Otherwise
do other processing.
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