Random errors

Just happens sometimes...

com.atlassian.confluence.InfrastructureException: Couldn't close the session
at com.atlassian.confluence.persistence.hibernate.HibernateThreadLocal.endSession(HibernateThreadLocal.java:76)
at com.atlassian.confluence.setup.ConfluenceConfigurationFilter.doFilter(ConfluenceConfigurationFilter.java:84)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:601)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:534)
Caused by: net.sf.hibernate.JDBCException: Cannot open connection: The database is already in use by another process
at net.sf.hibernate.impl.BatcherImpl.openConnection(BatcherImpl.java:265)
at net.sf.hibernate.impl.SessionImpl.connect(SessionImpl.java:3231)
at net.sf.hibernate.impl.SessionImpl.connection(SessionImpl.java:3214)
at com.atlassian.confluence.persistence.hibernate.HibernateThreadLocal.endSession(HibernateThreadLocal.java:58)
... 30 more
Caused by: java.sql.SQLException: The database is already in use by another process
at org.hsqldb.Trace.getError(Unknown Source)
at org.hsqldb.Trace.error(Unknown Source)
at org.hsqldb.Log.open(Unknown Source)
at org.hsqldb.Database$Logger.openLog(Unknown Source)
at org.hsqldb.Database.open(Unknown Source)
at org.hsqldb.Database.<init>(Unknown Source)
at org.hsqldb.jdbcConnection.openStandalone(Unknown Source)
at org.hsqldb.jdbcConnection.<init>(Unknown Source)
at org.hsqldb.jdbcDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:140)
at net.sf.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:97)
at net.sf.hibernate.impl.BatcherImpl.openConnection(BatcherImpl.java:262)
... 33 more

2003-09-25 19:26:46 StandardManager[] Cannot serialize session attribute DefaultComponentManager for session CD0348DDC9D21C58A58B9E3004251BBF
java.io.NotSerializableException: com.atlassian.confluence.search.lucene.LuceneIndexer
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at java.util.ArrayList.writeObject(ArrayList.java:529)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:809)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1296)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1439)
at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:881)
at org.apache.catalina.session.StandardManager.unload(StandardManager.java:536)
at org.apache.catalina.session.StandardManager.stop(StandardManager.java:691)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:3669)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:1036)
at org.apache.catalina.core.StandardHostDeployer.remove(StandardHostDeployer.java:470)
at org.apache.catalina.core.StandardHost.remove(StandardHost.java:852)
at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:758)
at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:738)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:360)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1221)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1233)
at org.apache.catalina.core.StandardService.stop(StandardService.java:554)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2225)
at org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:624)