java - Google App Engine Task Queue not working with eclipse plugin: org.quartz.SchedulerConfigException: Unable to instantiate class load helper class -


i trying implement gae task queue spring. receiving following error when run queue implementation.

error

info: processed c:\users\388638\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp3\pubsub\web-inf/queue.xml apr 14, 2014 12:14:11 pm com.google.appengine.api.taskqueue.dev.localtaskqueue init info: localtaskqueue initialized apr 14, 2014 12:14:11 pm com.google.appengine.tools.development.apiproxylocalimpl log severe: javax.servlet.servletcontext log: unavailable java.lang.runtimeexception: org.quartz.schedulerconfigexception: unable instantiate class load helper class: org.quartz.simpl.cascadingclassloadhelper cannot cast org.quartz.spi.classloadhelper [see nested exception: java.lang.classcastexception: org.quartz.simpl.cascadingclassloadhelper cannot cast org.quartz.spi.classloadhelper]   @ com.google.appengine.api.taskqueue.dev.localtaskqueue.startscheduler(localtaskqueue.java:645) @ com.google.appengine.api.taskqueue.dev.localtaskqueue.start_(localtaskqueue.java:240)     @ com.google.appengine.api.taskqueue.dev.localtaskqueue.access$000(localtaskqueue.java:66)     @ com.google.appengine.api.taskqueue.dev.localtaskqueue$2.run(localtaskqueue.java:207)     @ java.security.accesscontroller.doprivileged(native method)     @ com.google.appengine.api.taskqueue.dev.localtaskqueue.start(localtaskqueue.java:204)     @ com.google.appengine.tools.development.apiproxylocalimpl.startservices(apiproxylocalimpl.java:604) 

queue code

@requestmapping("/subscribequeue") public string subscribeuser(@modelattribute testuser tuser, model model) {     string useremail=tuser.getemail();     system.out.println("user's email "+ useremail);     queue queue = queuefactory.getqueue("subscription-queue");     queue.add(taskoptions.builder.withurl("/sendusermail").param("emailid",useremail));     return "redirect:confirm"; } 

i using google app engine eclipse plugin. app engine jars added default. not using maven. app engine sdk version 1.9

the screenshot jars

enter image description here

referred this post

but don't see appengine-api-stubs.jar , appengine-testing-.jar in classpath. besides appengine needs jars @ runtime. doesn't let delete of jars.

i tried removing appengine-api-labs.jar , running doesn't work. can please provide on this? how rid of error?


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