We receive this error when we try to call queue.add or with the task
scheduler admin console (_ah/_ah/admin/taskqueue). What might be going
wrong? Help really appreciated.
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.labs.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
298)
at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.start_(LocalTaskQueue.java:
135)
at com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.access
$000(LocalTaskQueue.java:41)
at com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue
$1.run(LocalTaskQueue.java:100)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.start(LocalTaskQueue.java:
98)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.startServices(ApiProxyLocalImpl.java:
373)
at com.google.appengine.tools.development.ApiProxyLocalImpl.access
$500(ApiProxyLocalImpl.java:42)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$2.run(ApiProxyLocalImpl.java:356)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$2.run(ApiProxyLocalImpl.java:354)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.getService(ApiProxyLocalImpl.java:
353)
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:693)
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
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.headerComplete(HttpConnection.java:830)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
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)
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.labs.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
288)
... 41 more
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.labs.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
288)
at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.start_(LocalTaskQueue.java:
135)
at com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.access
$000(LocalTaskQueue.java:41)
at com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue
$1.run(LocalTaskQueue.java:100)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.start(LocalTaskQueue.java:
98)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.startServices(ApiProxyLocalImpl.java:
373)
at com.google.appengine.tools.development.ApiProxyLocalImpl.access
$500(ApiProxyLocalImpl.java:42)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$2.run(ApiProxyLocalImpl.java:356)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$2.run(ApiProxyLocalImpl.java:354)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.getService(ApiProxyLocalImpl.java:
353)
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:693)
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
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.headerComplete(HttpConnection.java:830)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
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)
* Nested Exception (Underlying Cause) ---------------
java.lang.ClassCastException:
org.quartz.simpl.CascadingClassLoadHelper cannot be cast to
org.quartz.spi.ClassLoadHelper
at
org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:
546)
at
org.quartz.impl.StdSchedulerFactory.getScheduler(StdSchedulerFactory.java:
1152)
at
org.quartz.impl.StdSchedulerFactory.getDefaultScheduler(StdSchedulerFactory.java:
1168)
at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.startScheduler(LocalTaskQueue.java:
288)
at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.start_(LocalTaskQueue.java:
135)
at com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.access
$000(LocalTaskQueue.java:41)
at com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue
$1.run(LocalTaskQueue.java:100)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.api.labs.taskqueue.dev.LocalTaskQueue.start(LocalTaskQueue.java:
98)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.startServices(ApiProxyLocalImpl.java:
373)
at com.google.appengine.tools.development.ApiProxyLocalImpl.access
$500(ApiProxyLocalImpl.java:42)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$2.run(ApiProxyLocalImpl.java:356)
at com.google.appengine.tools.development.ApiProxyLocalImpl
$2.run(ApiProxyLocalImpl.java:354)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.appengine.tools.development.ApiProxyLocalImpl.getService(ApiProxyLocalImpl.java:
353)
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:693)
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
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.headerComplete(HttpConnection.java:830)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
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)
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