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https://issues.apache.org/jira/browse/DERBY-4973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984335#action_12984335
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Dag H. Wanvik commented on DERBY-4973:
--------------------------------------
Ah, yes, I guess I misunderstood what you are trying to achieve here. I thought
that the correct behaviour would be to actually *see* the change by another
thread, but in a thread safe way. If you need a thread local copy, then adding
volatile wouldn't help surely. But yes, if volatile is *not* used, the thread
is not forced to reread from memory if the compiler knows it hasn't been
changed by the current thread. Or that's how I understand it anyway.
> NullPointerException in updatelocks.sql encryption tests on IBM 1.6
> --------------------------------------------------------------------
>
> Key: DERBY-4973
> URL: https://issues.apache.org/jira/browse/DERBY-4973
> Project: Derby
> Issue Type: Bug
> Components: Store
> Affects Versions: 10.8.0.0
> Environment: Booting Derby version The Apache Software Foundation -
> Apache Derby - 10.8.0.0 alpha - (1058840): instance
> a816c00e-012d-839a-de59-ffff9cf6fc6d
> on database directory
> C:\jartest\JarResults.2011-01-13\ibm16_derbyall\derbyall\encryptionAll\storemats\storemats\updatelocks\wombat
> with class loader sun.misc.Launcher$AppClassLoader@4bf94bf9
> Loaded from file:/C:/jartest/classes/derby.jar
> java.vendor=IBM Corporation
> java.runtime.version=jvmwi3260sr9-20101124_69295
> java.fullversion=JRE 1.6.0 IBM J9 2.4 Windows XP x86-32
> jvmwi3260sr9-20101124_69295 (JIT enabled, AOT enabled)
> J9VM - 20101124_069295
> JIT - r9_20101028_17488ifx2
> GC - 20101027_AA
> Reporter: Kathey Marsden
> Attachments: updatelocks_results.zip
>
>
> The IBM 1.6 results for Jan 13, 2011 show the following failure for IBM 1.6
> on XP
> *** End: TestEnc jdk1.6.0 DerbyNetClient derbynetclientmats:encodingTests
> 2011-01-14 00:05:38 ***
> ********* Diff file
> derbyall/encryptionAll/storemats/storemats/updatelocks.diff
> *** Start: updatelocks jdk1.6.0 storemats:storemats 2011-01-14 00:18:37 ***
> 19859a19860,19868
> > ERROR 38000: The exception 'java.lang.NullPointerException' was thrown
> > while evaluating an expression.
> > ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> > ij> next scan_cursor;
> > A |B |C
> >
> > --------------------------------------------------------------------------------------------------------------------------------------------------------
> > -3 |-30 |-three
> >
> > ij> update a set a=3,b=30,c='three' where current of scan_cursor;
> > 1 row inserted/updated/deleted
> > ij> select * from lock_table order by tabname, type desc, mode, cnt,
> > lockname;
> 19861a19871
> > APP |UserTran|TABLE |1 |IX |A |Tablelock |GRANT|ACTIVE
> 19866,19876d19875
> < -3 |-30 |-three
>
> < ij> update a set a=3,b=30,c='three' where current of scan_cursor;
> < 1 row inserted/updated/deleted
> < ij> select * from lock_table order by tabname, type desc, mode, cnt,
> lockname;
> < USERNAME|TRANTYPE|TYPE |CNT |MODE|TABNAME |LOCKNAME |STATE|STATUS
> < ---------------------------------------------------------------------------
> < APP |UserTran|TABLE |1 |IX |A |Tablelock |GRANT|ACTIVE
> < APP |UserTran|TABLE |1 |X |A |Tablelock |GRANT|ACTIVE
> < ij> next scan_cursor;
> < A |B |C
>
> <
> --------------------------------------------------------------------------------------------------------------------------------------------------------
> Test Failed.
> *** End: updatelocks jdk1.6.0 storemats:storemats 2011-01-14 00:19:24 ***
> ------------------------------------------------------
> Stack trace is:
> Fri Jan 14 00:19:08 PST 2011 Thread[main,5,main] (XID = 2648), (SESSIONID =
> 1), (DATABASE = wombat), (DRDAID = null), Failed Statement is: select * from
> lock_table order by tabname, type desc, mode, cnt, lockname
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown while
> evaluating an expression.
> at org.apache.derby.iapi.error.StandardException.newException(Unknown
> Source)
> at
> org.apache.derby.iapi.error.StandardException.unexpectedUserException(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.VTIResultSet.populateFromResultSet(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.VTIResultSet.getNextRowCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.HashTableResultSet.getNextRowFromRowSource(Unknown
> Source)
> at
> org.apache.derby.iapi.store.access.BackingStoreHashtable.getNextRowFromRowSource(Unknown
> Source)
> at
> org.apache.derby.iapi.store.access.BackingStoreHashtable.<init>(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.HashTableResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.JoinResultSet.openRight(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.JoinResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.SortResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(Unknown Source)
> at
> org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
> at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.tools.ij.ij.executeImmediate(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.doCatch(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.go(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.go(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.mainCore(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.main(Unknown Source)
> at org.apache.derby.tools.ij.main(Unknown Source)
> Caused by: java.lang.NullPointerException
> at org.apache.derby.impl.store.raw.xact.Xact.getContextId(Unknown
> Source)
> at
> org.apache.derby.impl.store.raw.xact.TransactionTableEntry.getTransactionTypeString(Unknown
> Source)
> at org.apache.derby.diag.TransactionTable.getString(Unknown Source)
> at org.apache.derby.iapi.types.SQLChar.setValueFromResultSet(Unknown
> Source)
> ... 25 more
> ============= begin nested exception, level (1) ===========
> java.lang.NullPointerException
> at org.apache.derby.impl.store.raw.xact.Xact.getContextId(Unknown
> Source)
> at
> org.apache.derby.impl.store.raw.xact.TransactionTableEntry.getTransactionTypeString(Unknown
> Source)
> at org.apache.derby.diag.TransactionTable.getString(Unknown Source)
> at org.apache.derby.iapi.types.SQLChar.setValueFromResultSet(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.VTIResultSet.populateFromResultSet(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.VTIResultSet.getNextRowCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.HashTableResultSet.getNextRowFromRowSource(Unknown
> Source)
> at
> org.apache.derby.iapi.store.access.BackingStoreHashtable.getNextRowFromRowSource(Unknown
> Source)
> at
> org.apache.derby.iapi.store.access.BackingStoreHashtable.<init>(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.HashTableResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.JoinResultSet.openRight(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.JoinResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.SortResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(Unknown Source)
> at
> org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
> at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.tools.ij.ij.executeImmediate(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.doCatch(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.go(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.go(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.mainCore(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.main(Unknown Source)
> at org.apache.derby.tools.ij.main(Unknown Source)
> ============= end nested exception, level (1) ===========
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