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https://issues.apache.org/jira/browse/DERBY-4200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725845#action_12725845
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Kathey Marsden commented on DERBY-4200:
---------------------------------------
If you would like to produce a heap dump on another machine at the same point
in the test with the IBM 1.6 jvm you can gc() and then call
com.ibm.jvm.Dump.HeapDump();
com.ibm.jvm.Dump.JavaDump();
The same tool mentioned in the previous comment can read the heap dump.
Then you can see if those Statement objects are present on other platforms.
Perhaps you could also just run with a slightly smaller heap set in
derbyStress_app.properties to get the OOM.
> client side OutOfMemoryError running derbnetclientmats:jdbcapi/derbyStress
> --------------------------------------------------------------------------
>
> Key: DERBY-4200
> URL: https://issues.apache.org/jira/browse/DERBY-4200
> Project: Derby
> Issue Type: Bug
> Components: Network Client
> Affects Versions: 10.5.1.2
> Environment: java version "1.5.0"
> Java(TM) 2 Runtime Environment, Standard Edition (build pxi32devifx-20070806
> (SR5a))
> IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Linux x86-32 j9vmxi3223-20070426
> (JIT enabled)
> J9VM - 20070420_12448_lHdSMR
> JIT - 20070419_1806_r8
> GC - 200704_19)
> JCL - 20070725
> SUSE linux running on vmware.
> Reporter: Kathey Marsden
> Attachments: heapdump.20090428.084024.25679.phd,
> javacore.20090428.084024.25679.txt
>
>
> On the nightly run for 4/27 - 10.5.1.2 - (769232), I saw client
> jdbcapi/derbystress.java run out of heap space. The test has not failed
> like this before on the same machine with the same JVM, and the one checkin
> on that day DERBY-3991 could not account for this failure.
> I will attach the javacore and heapdump. Taking a quick look at the heap
> dump, it seems to have a lot of client side Statement objects, which seems to
> be just the leak the test is checking for. Note: the test runs with 64MB
> heap. It would be interesting to run with other jvms and force a gc() and a
> heap dump at this point in the test and see if we still have a lot of
> Statement objects or if this is a specific platform/JVM issue.
> The trace at the time of failure was :
> 1XMCURTHDINFO Current Thread Details
> NULL ----------------------
> 3XMTHREADINFO "main" (TID:0x0808D300, sys_thread_t:0x0805CBC8, state:R,
> native ID:0x0000644F) prio=5
> 4XESTACKTRACE at
> org/apache/derby/client/am/Cursor.allocateCharBuffer(Bytecode PC:77(Compiled
> Code))
> 4XESTACKTRACE at
> org/apache/derby/client/net/NetStatementReply.parseSQLDTARDarray(Bytecode
> PC:77(Compiled Code))
> 4XESTACKTRACE at
> org/apache/derby/client/net/NetStatementReply.parseQRYDSC(Bytecode
> PC:10(Compiled Code))
> 4XESTACKTRACE at
> org/apache/derby/client/net/NetStatementReply.parseOpenQuery(Bytecode
> PC:104(Compiled Code))
> 4XESTACKTRACE at
> org/apache/derby/client/net/NetStatementReply.parseOPNQRYreply(Bytecode
> PC:14(Compiled Code))
> 4XESTACKTRACE at
> org/apache/derby/client/net/NetStatementReply.readOpenQuery(Bytecode
> PC:6(Compiled Code))
> 4XESTACKTRACE at
> org/apache/derby/client/net/StatementReply.readOpenQuery(Bytecode
> PC:7(Compiled Code))
> 4XESTACKTRACE at
> org/apache/derby/client/net/NetStatement.readOpenQuery_(Bytecode
> PC:11(Compiled Code))
> 4XESTACKTRACE at
> org/apache/derby/client/am/Statement.readOpenQuery(Bytecode PC:6(Compiled
> Code))
> 4XESTACKTRACE at
> org/apache/derby/client/am/Statement.flowExecute(Bytecode PC:581(Compiled
> Code))
> 4XESTACKTRACE at
> org/apache/derby/client/am/Statement.executeQueryX(Bytecode PC:3(Compiled
> Code))
> 4XESTACKTRACE at
> org/apache/derby/client/am/Statement.executeQuery(Bytecode PC:3(Compiled
> Code))
> 4XESTACKTRACE at
> org/apache/derbyTesting/functionTests/tests/jdbcapi/derbyStress.testDerby3316(derbyStress.java:156)
> 4XESTACKTRACE at
> org/apache/derbyTesting/functionTests/tests/jdbcapi/derbyStress.main(derbyStress.java:57(Compiled
> Code))
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