IBM Support

IZ92037: HEAP WASTE WHEN USING STRINGBUFFER.TOSTRING(), STRINGBUILDER.TOS TRING()

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: Excess heap usage
.
Stack Trace: N/A
.
This behaviour is already in the Oracle JDK

This behaviour can be controlled in the IBM supplied iFixes with
this option:
-Djava.lang.string.create.unique=true

Local fix

  • 



Problem summary


    

  • When using the StringBuffer and StringBuilder toString method,
the produced string contains excess characters that result in a
waste of space.

    



Problem conclusion


    

  • This defect will be fixed in:
5.0.0 SR13
6.0.0 SR10
.
The JVM libraries have been updated to prevent the overhead,
this behaviour is enabled using
-Djava.lang.string.create.unique=true
.
To obtain the fix:
Install build 20110305 or later

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ92037
    • 

  • Reported component name
    JAVA 5 J9 COMMO
    • 

  • Reported component ID
    620500127
    • 

  • Reported release
    500
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2011-01-14
    • 

  • Closed date
    2011-03-16
    • 

  • Last modified date
    2011-03-16
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    
IZ92080
    

    • 



Fix information


    

  • Fixed component name
    JAVA 5 J9 COMMO
    • 

  • Fixed component ID
    620500127
    • 



Applicable component levels


    

  • R500  PSN
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            16 March 2011
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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