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IV25044: NAMINGMANAGER.GETURLCONTEXT() IN MULTI THREAD CAUSE MORE CPU USA GE


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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: We see a bottleneck in classloading:

 sys_mon_t:0x3F1B3B80 infl_mon_t: 0x3F1B3BA0:

com/ibm/ws/classloader/CompoundClassLoader@0x94C6E598/0x94C6E5A4
:
    owner "MessageListenerThreadPool : 29" (0x3D89EE00), entry
count 1
      Waiting to enter:
         "MessageListenerThreadPool : 23" (0x383B1D00)
         "MessageListenerThreadPool : 25" (0x3DA12900)
         "MessageListenerThreadPool : 28" (0x3DC19200)
         "MessageListenerThreadPool : 33" (0x36C7D500)
         "MessageListenerThreadPool : 36" (0x3FCFD000)
         "MessageListenerThreadPool : 37" (0x4036CA00)
         "MessageListenerThreadPool : 38" (0x4200D900)
         "MessageListenerThreadPool : 39" (0x4038CB00)



Below is the callstack of the threads blocked:

"MessageListenerThreadPool : 23" J9VMThread:0x383B1D00,
j9thread_t:0x3E4A5E4C, java/lang/Thread:0x9B7B8F18, state:B,
prio=5
(native thread ID:0x15D017F, native priority:0x5, native
policy:UNKNOWN)

Java callstack:
  at java/lang/ClassLoader.loadClass
                                 (ClassLoader.java:626(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.findProviderClass
                                       (Bytecode PC:55(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.newInstance
                                        (Bytecode PC:3(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.createObject
                                      (Bytecode PC:529(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.createObject
                                        (Bytecode PC:3(Compiled
Code))
  at org/apache/xerces/parsers/DOMParser.<init>
                                        (Bytecode PC:5(Compiled
Code))
  at org/apache/xerces/parsers/DOMParser.<init>
                                        (Bytecode PC:3(Compiled
Code))
  at com/ibm/wsbc/acs/util/ACXMLHelper.getDocument
                                  (ACXMLHelper.java:17(Compiled
Code))
  at
org/frb/ny/payman/internal/entity/StateTransitionOptionXMLToHash
Map
 .getDocument(StateTransitionOptionXMLToHashMap.java:146(Compile
d Code))


"MessageListenerThreadPool : 29" J9VMThread:0x3D89EE00,
j9thread_t:0x402E8BDC, java/lang/Thread:0x97DAB358, state:B,
prio=5
(native thread ID:0x3B20169, native priority:0x5, native
policy:UNKNOWN)

Java callstack:
  at sun/misc/Launcher$AppClassLoader.loadClass
                                    (Launcher.java:338(Compiled
Code))
  at java/lang/ClassLoader.loadClass
                                 (ClassLoader.java:626(Compiled
Code))
  at org/eclipse/osgi/framework/internal/core/BundleLoader
                      .findClass(BundleLoader.java:363(Compiled
Code))
  at org/eclipse/osgi/framework/internal/core/BundleLoader
                      .findClass(BundleLoader.java:347(Compiled
Code))
  at org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader
                 .loadClass(DefaultClassLoader.java:83(Compiled
Code))
  at java/lang/ClassLoader.loadClass
                                 (ClassLoader.java:652(Compiled
Code))
  at com/ibm/ws/bootstrap/ExtClassLoader.loadClass
                              (ExtClassLoader.java:111(Compiled
Code))
  at java/lang/ClassLoader.loadClass
                                 (ClassLoader.java:626(Compiled
Code))
  at com/ibm/ws/classloader/ProtectionClassLoader.loadClass
                        (ProtectionClassLoader.java:62(Compiled
Code))
  at com/ibm/ws/classloader/ProtectionClassLoader.loadClass
                        (ProtectionClassLoader.java:58(Compiled
Code))
  at com/ibm/ws/classloader/CompoundClassLoader.loadClass
                         (CompoundClassLoader.java:510(Compiled
Code))
  at java/lang/ClassLoader.loadClass
                                 (ClassLoader.java:626(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.findProviderClass
                                       (Bytecode PC:55(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.newInstance
                                        (Bytecode PC:3(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.createObject
                                      (Bytecode PC:529(Compiled
Code))
  at org/apache/xerces/parsers/ObjectFactory.createObject
                                        (Bytecode PC:3(Compiled
Code))
  at org/apache/xerces/parsers/DOMParser.<init>
                                        (Bytecode PC:5(Compiled
Code))
  at org/apache/xerces/parsers/DOMParser.<init>
                                        (Bytecode PC:3(Compiled
Code))
  at com/ibm/wsbc/acs/util/ACXMLHelper.getDocument
                                  (ACXMLHelper.java:17(Compiled
Code))




Which is blocked at more classloadering:

 sys_mon_t:0x34E2ADE0 infl_mon_t: 0x34E2AE00:
   sun/misc/Launcher$AppClassLoader@0x903A7530/0x903A753C: Flat
locked
    by "MessageListenerThreadPool : 44" (0x36927D00), entry
count 1
      Waiting to enter:
         "MessageListenerThreadPool : 29" (0x3D89EE00)


"MessageListenerThreadPool : 44" J9VMThread:0x36927D00,
j9thread_t:0x4051CCB4, java/lang/Thread:0x975C6F90, state:CW,
prio=5
(native thread ID:0x3AC019F, native priority:0x5, native
policy:UNKNOWN)

Java callstack:
 at java/net/URL.<init>(URL.java:465(Compiled Code))
 at sun/misc/URLClassPath$FileLoader.getResource
                           (URLClassPath.java:1197(Compiled
Code))
 at sun/misc/URLClassPath$FileLoader.findResource
                          (URLClassPath.java:1186(Com piled
Code))
 at sun/misc/URLClassPath.findResource
                            (URLClassPath.java:250(Compiled
Code))
 at java/net/URLClassLoader$4.run
                          (URLClassLoader.java:752(Compiled
Code))
 at java/security/AccessController.doPrivileged

(AccessController.java:224)
 at java/net/URLClassLoader.findResource
                          (URLClassLoader.java:749(Compiled
Code))
 at java/lang/ClassLoader.getResource
                             (ClassLoader.java:444(Compiled
Code))
 at java/lang/ClassLoader.getResourceAsStream
                             (ClassLoader.java:511(Compiled
Code))
 at java/lang/ClassLoader.getSystemResourceAsStream
                             (ClassLoader.java:611(Compiled
Code))
 at org/apache/xerces/parsers/SecuritySupport$6.run
                                   (Bytecode PC:11(Compiled
Code))
 at java/security/AccessController.doPrivileged
                        (AccessController.java:202(Compiled
Code))
 at
org/apache/xerces/parsers/SecuritySupport.getResourceAsStream
                                   (Bytecode PC:10(Compiled
Code))
 at
org/apache/xerces/parsers/ObjectFactory.findJarServiceProvider
                                   (Bytecode PC:84(Compiled
Code))
 at org/apache/xerces/parsers/ObjectFactory.createObject
                                  (Bytecode PC:475(Compiled
Code))
 at org/apache/xerces/parsers/ObjectFactory.createObject
                                    (Bytecode PC:3(Compiled
Code))
 at org/apache/xerces/parsers/DOMParser.<init>
                                    (Bytecode PC:5(Compiled
Code))
 at org/apache/xerces/parsers/DOMParser.<init>
                                    (Bytecode PC:3(Compiled
Code))
 at com/ibm/wsbc/acs/util/ACXMLHelper.getDocument
                              (ACXMLHelper.java:17(Compiled
Code))
 at
org/frb/ny/payman/internal/entity/StateTransitionOptionXMLToHash
Map
 .getDocument(StateTransitionOptionXMLToHashMap.java:146(Compile
d Code))
.
N/A

Local fix

  • N/A

Problem summary

  • The synchronized block in NamingManager.getURLContext() method
blocks too many codes.

Problem conclusion

  • This defect will be fixed in:
6.0.0 SR12
6.0.1 SR4
.
Break the large synchronized block into small piece which still
make it thread safe.

Temporary fix

  • N/A

Comments

  •  
    • 
  
 
  
APAR Information
 
  
 
   
     
    
  • APAR number
    IV25044
    •  
    
  • Reported component name
    JAVA CLASS LIBS
    •  
    
  • Reported component ID
    620700130
    •  
    
  • Reported release
    600
    •  
    
  • Status
    CLOSED PER
    •  
    
  • PE
    NoPE
    •  
    
  • HIPER
    NoHIPER
    •  
    
  • Special Attention
    NoSpecatt
    •  
    
  • Submitted date
    2012-07-23
    •  
    
  • Closed date
    2012-08-02
    •  
    
  • Last modified date
    2012-08-02
    •  
   
 
  
 
  
     
   
  • 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
 
  
     
   
  • R600 PSY
       UP
    •  
  
 
 
 

 









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Document information





	
Runtimes for Java Technology


	
Java Class Libraries


	




	
Software version:

	6.0

	





	
Reference #:

IV25044






Modified date:

2012-08-02








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