ClassNotFoundException (often) in Tomcat Application

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freh...@gmail.com

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Mar 6, 2014, 6:52:45 PM3/6/14

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I have one tomcat instance ONLY and am initializing a Hazelcast map in a ServletContextListener in the contextInitialized call.

I also store the created map on the ServletContext.

Finally, I store the ServletContext in a static variable in another class so I can easily access around my application.

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However, when I run a SqlPredicate in the map (after retrieving it from the ServletContext) I get a ClassNotFoundException on the class that I am storing on the map.

The ClassNotFoundException happens about 1 out of 3 times. I don't understand how my class can be there, then not there, then there again?

SEVERE: [10.224.168.202]:5701 [Test] com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: com.model.helper.ActiveUser

java.util.concurrent.ExecutionException: com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: com.model.helper.ActiveUser

at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)

at java.util.concurrent.FutureTask.get(FutureTask.java:111)

at com.hazelcast.map.operation.QueryOperation.runParallel(QueryOperation.java:127)

at com.hazelcast.map.operation.QueryOperation.run(QueryOperation.java:73)

at com.hazelcast.spi.impl.OperationServiceImpl.doRunOperation(OperationServiceImpl.java:273)

at com.hazelcast.spi.impl.OperationServiceImpl.runOperation(OperationServiceImpl.java:183)

at com.hazelcast.spi.impl.InvocationImpl.doInvoke(InvocationImpl.java:170)

at com.hazelcast.spi.impl.InvocationImpl.invoke(InvocationImpl.java:104)

at com.hazelcast.map.proxy.MapProxySupport.query(MapProxySupport.java:752)

at com.hazelcast.map.proxy.MapProxyImpl.values(MapProxyImpl.java:462)

at com.util.GlobalMaps.getActiveUserName(GlobalMaps.java:67) <------- my POJO with static variable to ServletContext and static methods against my created Hazelcast map stored on context

at com.services.v1.PlanService.getPlans(PlanService.java:29) <------- JAX-RS service (I believe this is under the covers really a servlet?)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:180)

at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96)

at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:165)

at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:89)

at org.apache.openejb.server.cxf.rs.AutoJAXRSInvoker.invoke(AutoJAXRSInvoker.java:66)

at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:57)

at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:93)

at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)

at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)

at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:237)

at org.apache.openejb.server.cxf.rs.CxfRsHttpListener.onMessage(CxfRsHttpListener.java:178)

at org.apache.openejb.server.rest.RsServlet.service(RsServlet.java:53)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.logging.log4j.core.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:66)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:724)

Caused by: com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: com.model.helper.ActiveUser

at com.hazelcast.nio.serialization.DefaultSerializers$ObjectSerializer.read(DefaultSerializers.java:190)

at com.hazelcast.nio.serialization.StreamSerializerAdapter.read(StreamSerializerAdapter.java:59)

at com.hazelcast.nio.serialization.SerializationServiceImpl.toObject(SerializationServiceImpl.java:218)

at com.hazelcast.map.operation.QueryOperation$1.call(QueryOperation.java:107)

at com.hazelcast.map.operation.QueryOperation$1.call(QueryOperation.java:89)

at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)

at java.util.concurrent.FutureTask.run(FutureTask.java:166)

at com.hazelcast.util.executor.ManagedExecutorService$Worker.run(ManagedExecutorService.java:166)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:724)

at com.hazelcast.util.executor.PoolExecutorThreadFactory$ManagedThread.run(PoolExecutorThreadFactory.java:59)

Caused by: java.lang.ClassNotFoundException: com.model.helper.ActiveUser

at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at org.apache.openejb.server.cxf.transport.util.CxfContainerClassLoader.findClass(CxfContainerClassLoader.java:95)

at org.apache.openejb.server.cxf.transport.util.CxfContainerClassLoader.loadClass(CxfContainerClassLoader.java:100)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at com.hazelcast.nio.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:83)

at com.hazelcast.nio.IOUtil$1.resolveClass(IOUtil.java:77)

at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1610)

at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1515)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)

at com.hazelcast.nio.serialization.DefaultSerializers$ObjectSerializer.read(DefaultSerializers.java:185)

... 11 more

Noctarius

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Mar 7, 2014, 1:28:08 AM3/7/14

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The exception sounds like there are class loader issues. Have you tried to the the web app class loader explicitly inside the listener (while initializing HZ?). I’m not yet sure which class loader is the TCCL (Thread Context ClassLoader) at time of executing the listener. Possibly it is the containers class loader but not the web app class loader. That way the container class loader won’t have access to your web app classes later on.

Chris

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freh...@gmail.com

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Mar 7, 2014, 6:18:08 PM3/7/14

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Thanks Chris, that indeed solved the problem!

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