APAR status
Closed as program error.
Error description
Error Message: java.lang.NullPointerException is incorrectly thrown from a program point that should not be able to observe a null value. The issue only occurs on X86. . Stack Trace: N/A. . The issue only occurs on the x86 platform when running Java 8SR5 FP21 to FP26 (8.0.5.21 through 8.0.5.26) inclusive.
Local fix
The problem can be circumvented with -Xjit:disableInlineCheckcast. This may have a minor impact on throughput performance.
Problem summary
The x86 code generator can fail to correctly generate an implicit NULLCHK sequence when evaluating a checkcastAndNULLCHK opcode. The failure to run the NULLCHK allows a null value to be observed at a point in the program where it is unexpected.
Problem conclusion
The JVM has been updated to correct apply null-check before checkcast again an interface. . This APAR will be fixed in the following Java Releases: 8 SR5 FP27 (8.0.5.27) . 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
IJ12157
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-12-13
Closed date
2018-12-13
Last modified date
2018-12-13
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
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"130","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
13 December 2018