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From "Jung,Joon Young (JIRA)" <j...@apache.org>
Subject [jira] [Created] (STR-3217) Title : Memory leak occurred on the org/apache/struts/util/FastHashMap.
Date Mon, 22 Oct 2012 07:04:12 GMT
Jung,Joon Young created STR-3217:
------------------------------------

             Summary: Title : Memory leak occurred on the org/apache/struts/util/FastHashMap.
                 Key: STR-3217
                 URL: https://issues.apache.org/jira/browse/STR-3217
             Project: Struts 1
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.2
         Environment: IT Environment : 
z/OS V1.11
WAS for z/OS 7.0.19,
Struts: The version is may be 1.0.2.:  
The MANIFEST.MF file in struts.jar contents is as below.
Manifest-Version: 1.0
Implementation-Version: 1.0.2
Specification-Title: Struts Framework
Specification-Version: 1.0
Implementation-Title: Struts Framework
Extension-Name: Struts Framework
Created-By: Ant 1.4.1
Implementation-Vendor-Id: org.apache
Implementation-Vendor: Apache Software Foundation
Specification-Vendor: Apache Software Foundation 
            Reporter: Jung,Joon Young
            Priority: Critical


Hello,
Recently, we received Memory leak problems from WAS for z/OS system.
( IT Environment : z/OS V1.11,WAS for z/OS 7.0.19,
Struts: The version is may be 1.0.2.:  The MANIFEST.MF file in struts.jar contents is as below.
Manifest-Version: 1.0
Implementation-Version: 1.0.2
Specification-Title: Struts Framework
Specification-Version: 1.0
Implementation-Title: Struts Framework
Extension-Name: Struts Framework
Created-By: Ant 1.4.1
Implementation-Vendor-Id: org.apache
Implementation-Vendor: Apache Software Foundation
Specification-Vendor: Apache Software Foundation )

After heap dump analysis, we found that the root cause of  memory leak problems is FastHashMap.

:220,493,664 (16%) [104] 2 org/apache/struts/util/FastHashMap 0x839ba6618

There are many FastHashMap entries in the Heap dump.

How can  I fix the  memory leak problems from FastHashMap ?
If you know, please let me advise.
Please refer to the below result from Heap dump analysis.
I will waiting for your expertise advise.

[Heap Dump Analysis result]

223,305,648 (16%) [64] 2 com/ibm/ws/cache/servlet/ServletWrapper 0x839ba6dd0
 223,305,352 (16%) [240] 20 org/apache/struts/action/ActionServlet 0x839ba6538
  220,493,664 (16%) [104] 2 org/apache/struts/util/FastHashMap 0x839ba6618
   220,493,416 (16%) [88] 1 java/util/HashMap 0x86f285220
    220,493,328 (16%) [4,112] 230 array of java/util/HashMap$Entry 0x86f285b58
     38,777,480 (2%) [72] 2 java/util/HashMap$Entry 0x86f287580   <--- 1)  Please
     11,773,272 (0%) [72] 3 java/util/HashMap$Entry 0x86f289110   <--- 2)  refer to
     11,334,272 (0%) [72] 2 java/util/HashMap$Entry 0x86f288f88   <---  3)  the below.
     11,287,736 (0%) [72] 2 java/util/HashMap$Entry 0x86f288460
     9,291,168 (0%) [72] 2 java/util/HashMap$Entry 0x86f286be0
     8,558,520 (0%) [72] 3 java/util/HashMap$Entry 0x86f285a78
     8,149,584 (0%) [72] 2 java/util/HashMap$Entry 0x86f289ab0
     7,790,768 (0%) [72] 2 java/util/HashMap$Entry 0x86f289618
     7,404,624 (0%) [72] 3 java/util/HashMap$Entry 0x86f289b90
     7,106,208 (0%) [72] 3 java/util/HashMap$Entry 0x86f288818
     7,074,480 (0%) [72] 3 java/util/HashMap$Entry 0x86f285688
     4,965,384 (0%) [72] 2 java/util/HashMap$Entry 0x86f286cf8
     4,888,064 (0%) [72] 3 java/util/HashMap$Entry 0x86f287b30
     3,716,624 (0%) [72] 2 java/util/HashMap$Entry 0x86f287a18
     3,623,008 (0%) [72] 2 java/util/HashMap$Entry 0x86f2858f0
     3,439,344 (0%) [72] 3 java/util/HashMap$Entry 0x86f2888c0

1)  
  38,777,480 (2%) [72] 2 java/util/HashMap$Entry 0x86f287580
     38,777,408 (2%) [56] 2 guar/CUST/actions/BY23YDAction 0x836b94450
      38,777,352 (2%) [88] 3 com/ibm/javart/v6/cso/CSOLocalPowerServerProxy
      223,305,352 (16%) [240] 20 org/apache/struts/action/ActionServlet
     136 (0%) [64] 1 java/lang/String 0x834ae86d8
    11,773,272 (0%) [72] 3 java/util/HashMap$Entry 0x86f289110

  2)  
11,178,552 (0%) [72] 2 java/util/HashMap$Entry 0x86f2890d8
      11,178,480 (0%) [56] 2 guar/CCHG_RC/actions/BQ04QRAction 0x8348c3958
      144 (0%) [64] 1 java/lang/String 0x834c0ac68
     594,648 (0%) [56] 2 guar/EXAM/actions/BH60JJAction 0x84117e7c8
     136 (0%) [64] 1 java/lang/String 0x834be7298

   3)
 11,334,272 (0%) [72] 2 java/util/HashMap$Entry 0x86f288f88
     11,334,200 (0%) [56] 2 guar/EXAM/actions/BG78HSAction 0x830a75a60
      11,334,144 (0%) [88] 3 com/ibm/javart/v6/cso/CSOLocalPowerServerProxy
      223,305,352 (16%) [240] 20 org/apache/struts/action/ActionServlet
     136 (0%) [64] 1 java/lang/String 0x834a83df0   







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