Hello, I'm currently unable to use task queues on the development
server.
Both attempts to run mapreduce jobs and to check local admin console
at http://127.0.0.1:8888/_ah/admin/taskqueue give this error:
org.quartz.SchedulerConfigException: Unable to instantiate class
load helper class: org.quartz.simpl.CascadingClassLoadHelper cannot be
cast to org.quartz.spi.ClassLoadHelper [See nested exception:
java.lang.ClassCastException:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper]
Caused by:
java.lang.RuntimeException: org.quartz.SchedulerConfigException:
Unable to instantiate class load helper class:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper [See nested exception:
java.lang.ClassCastException:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper]
at
com.google.appengine.api.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
433)
at
com.google.appengine.api.taskqueue.dev.LocalTaskQueue.start_(LocalTaskQueue.java:
194)
at com.google.appengine.api.taskqueue.dev.LocalTaskQueue.access
$000(LocalTaskQueue.java:49)
at com.google.appengine.api.taskqueue.dev.LocalTaskQueue
$2.run(LocalTaskQueue.java:161)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.api.taskqueue.dev.LocalTaskQueue.start(LocalTaskQueue.java:
158)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.startServices(ApiProxyLocalImpl.java:
466)
at com.google.appengine.tools.development.ApiProxyLocalImpl.access
$600(ApiProxyLocalImpl.java:44)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$1.run(ApiProxyLocalImpl.java:448)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$1.run(ApiProxyLocalImpl.java:446)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.getService(ApiProxyLocalImpl.java:
445)
at
com.google.apphosting.utils.servlet.TaskQueueViewerServlet.getLocalTaskQueueService(TaskQueueViewerServlet.java:
111)
at
com.google.apphosting.utils.servlet.TaskQueueViewerServlet.getQueueInfo(TaskQueueViewerServlet.java:
115)
at
com.google.apphosting.utils.servlet.TaskQueueViewerServlet.doGet(TaskQueueViewerServlet.java:
176)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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.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
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.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
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: org.quartz.SchedulerConfigException: Unable to instantiate
class load helper class: org.quartz.simpl.CascadingClassLoadHelper
cannot be cast to org.quartz.spi.ClassLoadHelper [See nested
exception: java.lang.ClassCastException:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper]
at
org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:
549)
at
org.quartz.impl.StdSchedulerFactory.getScheduler(StdSchedulerFactory.java:
1152)
at
org.quartz.impl.StdSchedulerFactory.getDefaultScheduler(StdSchedulerFactory.java:
1168)
at
com.google.appengine.api.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
423)
... 41 more
I already tried to remove appengine-testing.jar from the WEB_INF/lib/
directory (it's still in the classpath, since I need it for my tests)
as suggested elsewhere in the group, without success.
I'm running on Ubuntu, Eclipse Helios with the latest plugin
1.4.2.v201012211742. AppEngine SDK is Java SDK 1.4.0.v201012021502.
Any suggestions are appreciated.
Thanks very much
Lorenzo
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