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IJ12097: WRONG RESULT FROM STRING.INDEXOF AND STRING.LASTINDEXOF

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A.
.

Local fix

  • -Xjit:disableUnsafeFastPath or
-Xjit:{full/signature/of/the/problematic/method}(disableUnsafeFa
stPath) can be used to work around this issue. The latter one
has much smaller performance impact.

Problem summary

  • The problem is caused by JIT compiled code incorrectly widening
a byte value loaded from the backing array of a String.
Comparison using the widened value may unexpectedly fail. The
wrong widening occurs when String.indexOf and String.lastIndexOf
are compiled or inlined.

Problem conclusion

  • The JIT has been updated to correctly widen the byte value
loaded from String's backing array.
.
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
    IJ12097
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    130
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2018-12-11
    • 

  • Closed date
    2018-12-11
    • 

  • Last modified date
    2018-12-11
    • 





    

  • 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:
            

            11 December 2018
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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