IBM Support

IJ48844: IMPROVE PERFORMANCE OF JAVA.LANG.PACKAGE CLASS WHEN LOOKING UP CACHED PACKAGES.

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A
.
Improve startup performance for applications that load many
packages concurrently.

Local fix

  • N/A

Problem summary

  • java.lang.Package implementation caches defined packages in a
HashMap, which is queried during the construction of a new
Package object. Hashmap accesses are synchronized, which may
become a bottleneck when scaling across multiple threads.

Problem conclusion

  • The java.lang.Package implementation has been updated to use a
ConcurrentHashMap instead, which may alleviate such
multi-threaded contention.

.
This APAR will be fixed in the following Releases:
.
IBM SDK, Java Technology Edition
   8    SR8 FP15  (8.0.8.15)
.
Contact your IBM Product's Service Team for these Service
Refreshes and Fix Packs.
For those running stand-alone, information about the available
maintenance can be found at:
           https://www.ibm.com/support/pages/java-sdk

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ48844
    • 

  • Reported component name
    JAVA CLASS LIBS
    • 

  • Reported component ID
    620700130
    • 

  • Reported release
    800
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-10-10
    • 

  • Closed date
    2023-10-10
    • 

  • Last modified date
    2023-10-10
    • 





    

  • 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
    JAVA CLASS LIBS
    • 

  • Fixed component ID
    620700130
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            11 October 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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