APAR status
Closed as program error.
Error description
Error Message: An unexpected ArrayIndexOutOfBoundsException was observed with the following Java stack trace: java.lang.ArrayIndexOutOfBoundsException at org.apache.derby.impl.store.access.conglomerate.GenericScanContr oller.fetchRows(Unknown Source) at org.apache.derby.impl.store.access.heap.HeapScan.fetchNextGroup( Unknown Source) at org.apache.derby.impl.sql.execute.BulkTableScanResultSet.reloadA rray(Unknown Source) at org.apache.derby.impl.sql.execute.BulkTableScanResultSet.getNext RowCore(Unknown Source) at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNe xtRowCore(Unknown Source) at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNex tRow(Unknown Source) ... . Stack Trace: N/A .
Local fix
This issue can be avoided using the -Xjit:disableZGryphon option. This option may cause a noticeable performance degradation.
Problem summary
The problem occurs in the scenario where an if-statement is conditionally guarding a constant assignment to a long variable or field. i.e.: long x; if (....) x = -1; Depending on profiling information, the JIT compiler may incorrectly generate an unconditional store for the assignment, effectively ignoring the if-condition's value. This may result in an incorrect value being set to the long variable / field. The problem will only occur on 64-bit JDKs on Linux on Z or zOS, running on z196 hardware.
Problem conclusion
This defect will be fixed in: 6.0.1 SR2 FP1 7.0.0 SR2 . The JVM has been updated to generate the proper conditional store instruction.
Temporary fix
Comments
APAR Information
APAR number
IV19615
Reported component name
JIT
Reported component ID
620700124
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-04-12
Closed date
2012-05-18
Last modified date
2012-09-07
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
JIT
Fixed component ID
620700124
Applicable component levels
R260 PSY
UP
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Document Information
Modified date:
07 September 2012