when i was trying to call a datamining weka code from an onAction method i am
getting this error
here is the exception

# java.lang.NoClassDefFoundError
org/finalproject/weatherpredictor/pages/myServices/PredictService
# java.lang.ClassNotFoundException
caught an exception while obtaining a class file for
org.finalproject.weatherpredictor.pages.myServices.PredictService

exception
  java.lang.RuntimeException: javassist.NotFoundException:
weka.core.Instances

# java.lang.RuntimeException
javassist.NotFoundException: weka.core.Instances
# javassist.NotFoundException
weka.core.Instances

Hide uninteresting stack frames Stack trace

    * javassist.ClassPool.get(ClassPool.java:436)
    * javassist.bytecode.Descriptor.toCtClass (Descriptor.java:591)
    *
javassist.bytecode.Descriptor.getParameterTypes (Descriptor.java:438)
    * javassist.CtBehavior.getParameterTypes(CtBehavior.java:244)
    *
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.toMethodSignature(InternalClassTransformationImpl.java:1566)
    *
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.access$000(InternalClassTransformationImpl.java:53)
    *
org.apache.tapestry5.internal.services.InternalClassTransformationImpl$TransformMethodImpl.<init>(InternalClassTransformationImpl.java:106)
    *
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.recordMethod(InternalClassTransformationImpl.java:1115)
    *
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.preloadMethods(InternalClassTransformationImpl.java:868)
    *
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.preloadMembers(InternalClassTransformationImpl.java:861)
    *
org.apache.tapestry5.internal.services.InternalClassTransformationImpl.<init>(InternalClassTransformationImpl.java:767)
    *
org.apache.tapestry5.internal.services.ComponentClassTransformerImpl.transformComponentClass(ComponentClassTransformerImpl.java:163)
    *
$ComponentClassTransformer_1275dd5390a.transformComponentClass($ComponentClassTransformer_1275dd5390a.java)
    *
org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl.onLoad(ComponentInstantiatorSourceImpl.java:204)
    * javassist.Loader.findClass(Loader.java:340)
    *
org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl$PackageAwareLoader.findClass(ComponentInstantiatorSourceImpl.java:94)
    * javassist.Loader.loadClass(Loader.java:311)
    * java.lang.ClassLoader.loadClass (ClassLoader.java:252)
    * java.lang.ClassLoader.loadClassInternal (ClassLoader.java:320)
    *
org.finalproject.weatherpredictor.pages.myServices.CreateMyServices.onAction(CreateMyServices.java:130)
    *
org.finalproject.weatherpredictor.pages.myServices.CreateMyServices$MethodAccess_onAction_1275dd539f8.invoke(CreateMyServices$MethodAccess_onAction_1275dd539f8.java)
    *
org.apache.tapestry5.internal.transform.BaseEventHandlerMethodInvoker.invokeEventHandlerMethod(BaseEventHandlerMethodInvoker.java:52)
    *
org.apache.tapestry5.internal.transform.OnEventWorker$4.invokeEventHandlers(OnEventWorker.java:156)
    *
org.apache.tapestry5.internal.transform.OnEventWorker$4.advise(OnEventWorker.java:135)
    *
org.apache.tapestry5.internal.services.AbstractComponentMethodInvocation.proceed(AbstractComponentMethodInvocation.java:86)
    *
org.finalproject.weatherpredictor.pages.myServices.CreateMyServices.dispatchComponentEvent(CreateMyServices.java)
    *
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:938)
    *
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1126)
    *
org.apache.tapestry5.internal.services.ComponentEventRequestHandlerImpl.handle(ComponentEventRequestHandlerImpl.java:87)
    *
org.apache.tapestry5.internal.services.ImmediateActionRenderResponseFilter.handle(ImmediateActionRenderResponseFilter.java:42)
    *
$ComponentEventRequestHandler_1275dd53a09.handle($ComponentEventRequestHandler_1275dd53a09.java)
    *
org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
    *
$ComponentEventRequestHandler_1275dd53a09.handle($ComponentEventRequestHandler_1275dd53a09.java)
    *
org.apache.tapestry5.services.TapestryModule$38.handle(TapestryModule.java:2499)
    *
$ComponentEventRequestHandler_1275dd53a09.handle($ComponentEventRequestHandler_1275dd53a09.java)
    *
$ComponentEventRequestHandler_1275dd53934.handle($ComponentEventRequestHandler_1275dd53934.java)
    *
org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
    *
org.apache.tapestry5.services.InitializeActivePageName.handleComponentEvent(InitializeActivePageName.java:39)
    *
$ComponentRequestHandler_1275dd53935.handleComponentEvent($ComponentRequestHandler_1275dd53935.java)
    *
$ComponentRequestHandler_1275dd53925.handleComponentEvent($ComponentRequestHandler_1275dd53925.java)
    *
org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:46)
    * $Dispatcher_1275dd53927.dispatch($Dispatcher_1275dd53927.java)
    * $Dispatcher_1275dd5391d.dispatch($Dispatcher_1275dd5391d.java)
    *
org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:292)
    *
org.finalproject.weatherpredictor.services.AppModule$1.service(AppModule.java:90)
    *
$RequestFilter_1275dd5391c.service($RequestFilter_1275dd5391c.java)
    *
$RequestHandler_1275dd5391e.service($RequestHandler_1275dd5391e.java)
    *
org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
    *
$RequestHandler_1275dd5391e.service($RequestHandler_1275dd5391e.java)
    *
org.apache.tapestry5.services.TapestryModule$4.service(TapestryModule.java:917)
    *
$RequestHandler_1275dd5391e.service($RequestHandler_1275dd5391e.java)
    *
org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:907)
    *
$RequestHandler_1275dd5391e.service($RequestHandler_1275dd5391e.java)
    *
org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:85)
    *
$RequestHandler_1275dd5391e.service($RequestHandler_1275dd5391e.java)
    *
org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:90)
    *
org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:81)
    *
org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
    *
org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:103)
    *
$RequestHandler_1275dd5391e.service($RequestHandler_1275dd5391e.java)
    *
$RequestHandler_1275dd53913.service($RequestHandler_1275dd53913.java)
    *
org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:243)
    *
org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
    *
$HttpServletRequestHandler_1275dd53915.service($HttpServletRequestHandler_1275dd53915.java)
    *
org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
    *
$HttpServletRequestFilter_1275dd53912.service($HttpServletRequestFilter_1275dd53912.java)
    *
$HttpServletRequestHandler_1275dd53915.service($HttpServletRequestHandler_1275dd53915.java)
    *
org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:860)
    *
$HttpServletRequestHandler_1275dd53915.service($HttpServletRequestHandler_1275dd53915.java)
    *
$HttpServletRequestHandler_1275dd53910.service($HttpServletRequestHandler_1275dd53910.java)
    *
org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:147)
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