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PH52005: THIS APAR IS TO ADD A CACHE IN EMF OF THE SAXPARSERFACTORY

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APAR status

  • Closed as program error.

Error description

  • Client's upgrade from WebSphere 8.5.5.19 to 8.5.5.22 caused
significant performance regression

This APAR is to add a cache in EMF of the SAXParserFactory.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere                  *
*                  Application Server who also use IBM         *
*                  Business Automation Workflow                *
****************************************************************
* PROBLEM DESCRIPTION: Performance might be impacted after     *
*                      upgrading to WebSphere Application      *
*                      Server 8.5.5.21 due a security APAR     *
*                      PH38310.                                *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
PH38310 has a minor performance impact on the creation of a
SAXParser.  Some usages of Business Automation Workflow,
presumably applications needing to process a large number of
xml files, might cause repeated creation of a SAXParser, which
can cause a noticeable slow down.  Most users should not see
any noticeable impact after installing PH38310 or upgrading to
8.5.5.21 or higher.
Performance problems are typically investigated by taking java
thread dumps over regular intervals during the period of time
when the program seems to be slow.   The following is an
example stack trace from a thread dump for the reported
problem. Note the inclusion of XMLLoadImpl.makeParser. This
indicates that the thread is exercising code which creates a
SAXParser. In the reported problem most thread dumps contain a
stack similar to this.
Java callstack:
at
com/ibm/ws/classloader/CompoundClassLoader.loadClass(CompoundCla
ssLoader.java:556(Compiled Code))
(entered lock:
com/ibm/ws/classloader/CompoundClassLoader@0x0000000106B5A268,
entry count: 1)
at
java/lang/ClassLoader.loadClass(ClassLoader.java:876(Compiled
Code))
at
org/apache/xerces/impl/dv/ObjectFactory.findProviderClass(Byteco
de PC:55(Compiled Code))
at
org/apache/xerces/impl/dv/ObjectFactory.newInstance(Bytecode
PC:3(Compiled Code))
at org/apache/xerces/impl/dv/DTDDVFactory.getInstance(Bytecode
PC:5(Compiled Code))
...
at
org/apache/xerces/parsers/ObjectFactory.createObject(Bytecode
PC:3(Compiled Code))
...
at org/apache/xerces/jaxp/SAXParserImpl.<init>(Bytecode
PC:4(Compiled Code))
at
org/apache/xerces/jaxp/SAXParserFactoryImpl.newSAXParserImpl(Byt
ecode PC:9(Compiled Code))
at
org/apache/xerces/jaxp/SAXParserFactoryImpl.setFeature(Bytecode
PC:109(Compiled Code))
at
org/eclipse/emf/ecore/xmi/impl/XMLLoadImpl.makeParser(XMLLoadImp
l.java:379(Compiled Code))
at
org/eclipse/emf/ecore/xmi/impl/XMLLoadImpl.load(XMLLoadImpl.java
:188(Compiled Code))
at
org/eclipse/emf/ecore/xmi/impl/XMLResourceImpl.doLoad(XMLResourc
eImpl.java:179(Compiled Code))
at
org/eclipse/wst/common/internal/emf/resource/CompatibilityXMIRes
ourceImpl.basicDoLoad(CompatibilityXMIResourceImpl.java:180(Comp
iled Code))
at
org/eclipse/wst/common/internal/emf/resource/CompatibilityXMIRes
ourceImpl.doLoad(CompatibilityXMIResourceImpl.java:173(Compiled
Code))
at
org/eclipse/emf/ecore/resource/impl/ResourceImpl.load(ResourceIm
pl.java:1094(Compiled Code))
at
org/eclipse/emf/ecore/resource/impl/ResourceImpl.load(ResourceIm
pl.java:900(Compiled Code))
at
org/eclipse/wst/common/internal/emf/resource/CompatibilityXMIRes
ourceImpl.load(CompatibilityXMIResourceImpl.java:259(Compiled
Code))
at
com/ibm/websphere/resource/WASResourceImpl.load(WASResourceImpl.
java:286(Compiled Code))
(entered lock:
com/ibm/websphere/resource/WASResourceImpl@0x0000000654B90078,
entry count: 1)
at
org/eclipse/emf/ecore/resource/impl/ResourceSetImpl.demandLoad(R
esourceSetImpl.java:249(Compiled Code))
at
org/eclipse/emf/ecore/resource/impl/ResourceSetImpl.demandLoadHe
lper(ResourceSetImpl.java:264(Compiled Code))
at
org/eclipse/emf/ecore/resource/impl/ResourceSetImpl.getResource(
ResourceSetImpl.java:390(Compiled Code))
at
com/ibm/websphere/resource/WASResourceSetImpl.getResource(WASRes
ourceSetImpl.java:325(Compiled Code))
(entered lock:
com/ibm/websphere/resource/WASResourceSetImpl@0x0000000654B22280
, entry count: 2)
at
com/ibm/websphere/resource/WASResourceSetImpl.getResource(WASRes
ourceSetImpl.java:298(Compiled Code))
(entered lock:
com/ibm/websphere/resource/WASResourceSetImpl@0x0000000654B22280
, entry count: 1)
at
com/ibm/ws/runtime/service/ConfigRootImpl.getResource(ConfigRoot
Impl.java:351(Compiled Code))
at
com/ibm/ws/runtime/service/ConfigRootImpl.getResource(ConfigRoot
Impl.java:321(Compiled Code))
at
com/ibm/bpm/config/model/wccm/util/RuntimeWCCMHelper$3.run(Runti
meWCCMHelper.java:383(Compiled Code))
at
com/ibm/bpm/config/model/wccm/util/RuntimeWCCMHelper$3.run(Runti
meWCCMHelper.java:375(Compiled Code))
at
java/security/AccessController.doPrivileged(AccessController.jav
a:747(Compiled Code))
at
com/ibm/bpm/config/model/wccm/util/RuntimeWCCMHelper.getConfigOb
jects(RuntimeWCCMHelper.java:374(Compiled Code))
at
com/ibm/bpm/config/model/wccm/util/RuntimeWCCMHelper.getConfigOb
ject(RuntimeWCCMHelper.java:410(Compiled Code))
at
com/ibm/bpm/config/model/wccm/util/RuntimeWCCMHelper.getDeployme
ntEnvironments(RuntimeWCCMHelper.java:181(Compiled Code))
at
com/ibm/bpm/config/model/wccm/util/RuntimeWCCMHelper.getDeployme
ntEnvironments(RuntimeWCCMHelper.java:214(Compiled Code))
at
com/ibm/bpm/config/model/wccm/util/RuntimeWCCMHelper.getDeployme
ntEnvironment(RuntimeWCCMHelper.java:200(Compiled Code))
at
com/ibm/bpm/config/spi/ConfigurationSpi.getBPMURLByScenario(Conf
igurationSpi.java:1603(Compiled Code))
at
com/ibm/bpm/config/spi/WSConfigurationSpi.getBPMURLByScenario(WS
ConfigurationSpi.java:869(Compiled Code))
at
com/ibm/bpm/endpoint/impl/EndpointServiceUtils.getBpmUrl(Endpoin
tServiceUtils.java:115(Compiled Code))
at
com/ibm/bpm/endpoint/impl/EndpointServiceImpl.getEndpointUrl(End
pointServiceImpl.java:222(Compiled Code))
at
com/ibm/bpm/endpoint/impl/EndpointServiceImpl.getEndpointUrl(End
pointServiceImpl.java:119(Compiled Code))
at
com/lombardisoftware/server/ejb/clientservices/FavoriteSupport.g
etExposedURL(FavoriteSupport.java:1055(Compiled Code))
at
com/lombardisoftware/server/ejb/clientservices/ClientServicesCor
e.getExposedURL(ClientServicesCore.java:1978(Compiled Code))
at sun/reflect/GeneratedMethodAccessor432.invoke(Bytecode
PC:50(Compiled Code))
at
sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethod
AccessorImpl.java:55(Compiled Code))
at java/lang/reflect/Method.invoke(Method.java:508(Compiled
Code))
at
org/springframework/aop/support/AopUtils.invokeJoinpointUsingRef
lection(AopUtils.java:317(Compiled Code))
at
org/springframework/aop/framework/ReflectiveMethodInvocation.inv
okeJoinpoint(ReflectiveMethodInvocation.java:190(Compiled
Code))
at
org/springframework/aop/framework/ReflectiveMethodInvocation.pro
ceed(ReflectiveMethodInvocation.java:157(Compiled Code))
at
com/lombardisoftware/utility/spring/TransactionInterceptor.invok
e(TransactionInterceptor.java:76(Compiled Code))
at
org/springframework/aop/framework/ReflectiveMethodInvocation.pro
ceed(ReflectiveMethodInvocation.java:179(Compiled Code))
at
com/lombardisoftware/utility/spring/CoreEntryInterceptor.invoke(
CoreEntryInterceptor.java:44(Compiled Code))
at
com/lombardisoftware/utility/spring/PSCoreEntryInterceptor.invok
e(PSCoreEntryInterceptor.java:14(Compiled Code))
at org/springframework/aop/framework ...

    



Problem conclusion


    

  • The code has been updated to cache the SAXParser to avoid
creating it repeatedly.

The fix for this APAR is targeted for inclusion in fix pack
8.5.5.24 and 9.0.5.15 . For more information, see 'Recommended
Updates for WebSphere Application Server':
https://www.ibm.com/support/pages/node/715553

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PH52005
    • 

  • Reported component name
    WEBS APP SERV N
    • 

  • Reported component ID
    5724H8800
    • 

  • Reported release
    850
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-01-18
    • 

  • Closed date
    2023-03-17
    • 

  • Last modified date
    2023-03-28
    • 





    

  • 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
    WEBS APP SERV N
    • 

  • Fixed component ID
    5724H8800
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Line of Business":{"code":"LOB45","label":"Automation"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            28 March 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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