Enonic version: 7.6.1
OS: Linux
Hi!
This post is a small guide for those like me who got an error after server scaling and restart and the whole XP instance does not start. It is not clustered environment, just a single node, but with a very big database. No backups or snapshots were created. 
Why did it happen(my guess) - XP sandbox was not stopped properly and was hard rebooted via cloud admin UI. It led to index corruption. XP tried creating some node(in my case /identity), but failed because it already exists.
How to avoid(my guess) - stop XP sandbox/instance before rebooting server.
How did I fix it:
I needed to know which file failed, so I searched where identity node is indexed inside XP_HOME/repo/index with grep -nr '/identity' . . It returned me some files inside search-system-repo indexes. Then I did the following:
- Stop XP
- Delete
XP_HOME/repo/index/data/mycluster/nodes/0/indices/search-system-repo/ - I had a similar sandbox locally with very old testing data. Copied
search-system-repo/from local sandbox to prod. - Prod got old testing
search-system-repo/, and meaning most applications, users, roles were lost, since no indexes were present, but some old users(including admin) were present from indexes locally and gave some opportunities. The data should be fine, as it is stored in blob(my guess). - Run reindex via management endpoint and everything got to it’s place.
Enonic cli reindex did not work for me for some reason, but reindex via management endpoint did a perfect job:
The error log itself:
2022-02-21 01:01:23,327 INFO c.e.x.c.i.s.SecurityInitializer - Initializing [/identity] folder
2022-02-21 01:01:23,336 ERROR c.e.x.c.i.s.SecurityServiceActivator - bundle com.enonic.xp.core.security:7.5.0 (71)[com.enonic.xp.core.impl.security.SecurityServiceActivator(116)] : The activate method has thrown an exception
org.apache.felix.log.LogException: com.enonic.xp.node.NodeAlreadyExistAtPathException: Node already exists at /identity
at com.enonic.xp.repo.impl.node.CreateNodeCommand.verifyNotExistsAlready(CreateNodeCommand.java:225)
at com.enonic.xp.context.ContextImpl.runWith(ContextImpl.java:86)
at com.enonic.xp.repo.impl.node.NodeHelper.runAsAdmin(NodeHelper.java:15)
at com.enonic.xp.repo.impl.node.CreateNodeCommand.execute(CreateNodeCommand.java:68)
at com.enonic.xp.repo.impl.node.NodeServiceImpl.doCreate(NodeServiceImpl.java:461)
at com.enonic.xp.repo.impl.node.NodeServiceImpl.create(NodeServiceImpl.java:449)
at com.enonic.xp.core.impl.security.SecurityInitializer.initializeIdProviderParentFolder(SecurityInitializer.java:126)
at com.enonic.xp.core.impl.security.SecurityInitializer.lambda$doInitialize$0(SecurityInitializer.java:76)
at com.enonic.xp.context.ContextImpl.runWith(ContextImpl.java:86)
at com.enonic.xp.core.impl.security.SecurityInitializer.doInitialize(SecurityInitializer.java:74)
at com.enonic.xp.init.Initializer.initialize(Initializer.java:49)
at com.enonic.xp.core.impl.security.SecurityServiceImpl.initialize(SecurityServiceImpl.java:141)
at com.enonic.xp.core.impl.security.SecurityServiceActivator.activate(SecurityServiceActivator.java:34)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.invokeMethod(BaseMethod.java:242)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.access$500(BaseMethod.java:41)
at org.apache.felix.scr.impl.inject.methods.BaseMethod$Resolved.invoke(BaseMethod.java:678)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.invoke(BaseMethod.java:524)
at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:318)
at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:308)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:342)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:115)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:984)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:957)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:766)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168)
at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125)
at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:907)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:893)
at org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:128)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:960)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:733)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168)
at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125)
at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:335)
at com.enonic.xp.repo.impl.repository.RepositoryServiceActivator.activate(RepositoryServiceActivator.java:52)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.invokeMethod(BaseMethod.java:242)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.access$500(BaseMethod.java:41)
at org.apache.felix.scr.impl.inject.methods.BaseMethod$Resolved.invoke(BaseMethod.java:678)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.invoke(BaseMethod.java:524)
at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:318)
at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:308)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:342)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:115)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:984)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:957)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:766)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168)
at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125)
at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:907)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:893)
at org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:128)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:960)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:733)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168)
at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125)
at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:907)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:893)
at org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:128)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:960)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:733)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168)
at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125)
at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:907)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:893)
at org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:128)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:960)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:733)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168)
at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125)
at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:335)
at com.enonic.xp.elasticsearch.impl.ElasticsearchActivator.activate(ElasticsearchActivator.java:67)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.invokeMethod(BaseMethod.java:242)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.access$500(BaseMethod.java:41)
at org.apache.felix.scr.impl.inject.methods.BaseMethod$Resolved.invoke(BaseMethod.java:678)
at org.apache.felix.scr.impl.inject.methods.BaseMethod.invoke(BaseMethod.java:524)
at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:318)
at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:308)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:342)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:115)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:984)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:957)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:766)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091)
at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944)
at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880)
at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168)
at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125)
at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:907)
at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:893)
at org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:128)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:960)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:733)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.enableInternal(AbstractComponentManager.java:667)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.enable(AbstractComponentManager.java:433)
at org.apache.felix.scr.impl.manager.ConfigurableComponentHolder.enableComponents(ConfigurableComponentHolder.java:666)
at org.apache.felix.scr.impl.BundleComponentActivator.initialEnable(BundleComponentActivator.java:353)
at org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:553)
at org.apache.felix.scr.impl.Activator.access$200(Activator.java:69)
at org.apache.felix.scr.impl.Activator$ScrExtension.start(Activator.java:424)
at org.apache.felix.scr.impl.AbstractExtender.createExtension(AbstractExtender.java:196)
at org.apache.felix.scr.impl.AbstractExtender.modifiedBundle(AbstractExtender.java:169)
at org.apache.felix.scr.impl.AbstractExtender.modifiedBundle(AbstractExtender.java:49)
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:488)
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:420)
at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:232)
at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:450)
at org.apache.felix.framework.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:915)
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:834)
at org.apache.felix.framework.EventDispatcher.fireBundleEvent(EventDispatcher.java:516)
at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4817)
at org.apache.felix.framework.Felix.startBundle(Felix.java:2336)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1539)
at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:308)
at java.base/java.lang.Thread.run(Thread.java:834)