APAR status
Closed as program error.
Error description
Error Message: A call to Class.isAssignableFrom() may return an invalid result on Java8 running on X86 hardware (i.e. Linux on AMD/Intel or Windows). . Stack Trace: N/A . The problem can only occur on Java8 and only a X86 hardware. Previous versions of Java and other hardware platforms are not effected by this problem
Local fix
The problem can be avoid by setting the environment variable TR_disableInlineIsAssignableFrom=1 using the set command or the export command depending of the operating system.
Problem summary
In Java8 the JIT would attempt to replace calls to class.isAssignableFrom() with an equivalent set of instructions but that sequence of code left the possibility that the result of the call could be incorrect.
Problem conclusion
The JIT was modified so that isAssignableFrom() returns the correct results. . This APAR will be fixed in the following Java Releases: 8 SR2 (8.0.2.0) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the available Service Refreshes and Fix Packs can be found at: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IV78723
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-11-10
Closed date
2015-11-27
Last modified date
2015-11-30
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
R130 PSY
UP
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Document Information
Modified date:
30 November 2015