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Date: Mon, 6 Aug 2012 23:09:02 +0000 (UTC)
From: "Dag H. Wanvik (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
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Subject: [jira] [Commented] (DERBY-5894) NPE in OnlineBackupTest1 while
 backing up in stubFileToRemoveAfterCheckPoint
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    [ https://issues.apache.org/jira/browse/DERBY-5894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429559#comment-13429559 ] 

Dag H. Wanvik commented on DERBY-5894:
--------------------------------------

I checked the source for HashTable, and the NPE means the key is null, i.e. logInstant argument to stubFileToRemoveAfterCheckPoint.
                
> NPE in OnlineBackupTest1 while backing up in stubFileToRemoveAfterCheckPoint
> ----------------------------------------------------------------------------
>
>                 Key: DERBY-5894
>                 URL: https://issues.apache.org/jira/browse/DERBY-5894
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>            Reporter: Dag H. Wanvik
>         Attachments: d5894.zip
>
>
> Saw this while running OnlineBackupTest1 trying to repro DERBY-973.
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown while evaluating an expression.
>         at org.apache.derby.iapi.error.StandardException.newException(StandardException.java:288)
>         at org.apache.derby.iapi.error.StandardException.unexpectedUserException(StandardException.java:575)
>         at org.apache.derby.impl.services.reflect.ReflectMethod.invoke(ReflectMethod.java:63)
>         at org.apache.derby.impl.sql.execute.CallStatementResultSet.open(CallStatementResultSet.java:75)
>         at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(GenericPreparedStatement.java:443)
>         at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java:324)
>         at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java:1242)
>         at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(EmbedPreparedStatement.java:1715)
>         at org.apache.derby.impl.jdbc.EmbedCallableStatement.executeStatement(EmbedCallableStatement.java:118)
>         at org.apache.derby.impl.jdbc.EmbedPreparedStatement.execute(EmbedPreparedStatement.java:1370)
>         at org.apache.derbyTesting.functionTests.tests.store.OnlineBackup.performBackup(OnlineBackup.java:89)
>         at org.apache.derbyTesting.functionTests.tests.store.OnlineBackup.run(OnlineBackup.java:60)
>         at java.lang.Thread.run(Thread.java:637)
> Caused by: java.lang.NullPointerException
>         at java.util.Hashtable.put(Hashtable.java:401)
>         at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.stubFileToRemoveAfterCheckPoint(BaseDataFileFactory.java:1613)
>         at org.apache.derby.impl.store.raw.data.RAFContainer.run(RAFContainer.java:1651)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at org.apache.derby.impl.store.raw.data.RAFContainer.backupContainer(RAFContainer.java:983)
>         at org.apache.derby.impl.store.raw.data.BaseContainerHandle.backupContainer(BaseContainerHandle.java:1031)
>         at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.backupDataFiles(BaseDataFileFactory.java:2466)
>         at org.apache.derby.impl.store.raw.RawStore.backup(RawStore.java:978)
>         at org.apache.derby.impl.store.raw.RawStore.backup(RawStore.java:649)
>         at org.apache.derby.impl.store.access.RAMAccessManager.backup(RAMAccessManager.java:964)
>         at org.apache.derby.impl.db.BasicDatabase.backup(BasicDatabase.java:430)
>         at org.apache.derby.catalog.SystemProcedures.SYSCS_BACKUP_DATABASE(SystemProcedures.java:961)
>         at org.apache.derby.exe.acf33d40c7x0138x6d7cx6df3x0000720ad17b0.g0(Unknown Source)
>         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:592)
>         at org.apache.derby.impl.services.reflect.ReflectMethod.invoke(ReflectMethod.java:46)
>         ... 10 more

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