NullPointerException thrown on Cache Refresh when snapshot directory first defined

By: Bert Bee-Lindgren user 26 Mar 2015 at 3:09 p.m. CDT

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When first configuring Cache Refresh, our attempts to sync from our ldap directory resulted in an NPE (shown below). Looking at the source showed that this was that the cacheDirectory seems to only be read/initialized when the server is started. We worked around this problem by restarting the gluu-server environment. 2015-03-24 19:02:47,560 ERROR [gluu.oxtrust.ldap.cache.service.CacheRefreshTimer] (pool-1-thread-6) Exception happened while executing cache refresh synchronization java.lang.NullPointerException at java.io.File.<init>(File.java:277) at org.xdi.service.ObjectSerializationService.loadObject(ObjectSerializationService.java:74) 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.jboss.seam.util.Reflections.invoke(Reflections.java:22) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:196) at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:114) at org.xdi.service.ObjectSerializationService_$$_javassist_seam_41.loadObject(ObjectSerializationService_$$_javassist_seam_41.java) at org.gluu.oxtrust.ldap.cache.service.CacheRefreshTimer.detectChangedEntries(CacheRefreshTimer.java:307) at org.gluu.oxtrust.ldap.cache.service.CacheRefreshTimer.processImpl(CacheRefreshTimer.java:256) at org.gluu.oxtrust.ldap.cache.service.CacheRefreshTimer.process(CacheRefreshTimer.java:172) at sun.reflect.GeneratedMethodAccessor572.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:79) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.async.AsynchronousInterceptor.aroundInvoke(AsynchronousInterceptor.java:52) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:196) at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:114) at org.gluu.oxtrust.ldap.cache.service.CacheRefreshTimer_$$_javassist_seam_30.process(CacheRefreshTimer_$$_javassist_seam_30.java) at sun.reflect.GeneratedMethodAccessor567.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144) at org.jboss.seam.Component.callComponentMethod(Component.java:2313) at org.jboss.seam.core.Events.raiseEvent(Events.java:85) at org.jboss.seam.async.AsynchronousEvent$1.process(AsynchronousEvent.java:33) at org.jboss.seam.async.Asynchronous$ContextualAsynchronousRequest.run(Asynchronous.java:80) at org.jboss.seam.async.AsynchronousEvent.execute(AsynchronousEvent.java:27) at org.jboss.seam.async.ThreadPoolDispatcher$RunnableAsynchronous.run(ThreadPoolDispatcher.java:142) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) 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:745) 2015-03-24 19:02:47,561 DEBUG [gluu.oxtrust.ldap.cache.service.CacheRefreshTimer] (pool-1-thread-6) Allowing to run new process exclusively 2015-03-24 19:03:43,611 ERROR [gluu.oxtrust.ldap.cache.service.CacheRefreshTimer] (pool-1-thread-3) Exception happened while executing cache refres
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Answers

By Yuriy Movchan staff 27 Mar 2015 at 2:28 p.m. CDT

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Yes, in order to Cache Refresh proper work this folder for snapshots should be writable for tomcat user. You can try to fix this folder permissions, remove files inside this folder and wait for next Cache Refresh iteration (start) to see if there is no errors...

By Bert Bee-Lindgren user 27 Mar 2015 at 3:19 p.m. CDT

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My observation is that (unlike other cacheRefresh settings we've changed) the gluu-server needs to be restarted for changes to the snapshot directory to be used.

By Yuriy Movchan staff 30 Mar 2015 at 6 a.m. CDT

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Yuriy Movchan gravatar
According to the code: https://github.com/GluuFederation/oxTrust/blob/master/server/src/main/java/org/gluu/oxtrust/ldap/cache/service/CacheRefreshTimer.java it calls configuration properties reload in line 226 at every Cache Refresh run.

By Bert Bee-Lindgren user 31 Mar 2015 at 8:47 a.m. CDT

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I know it is trying to refresh the config, but the fact remains that the product NPE'ed repeatedly on a null path to the inum_cache.dat that should have not been found via line 143. I wish I could investigate more.

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