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From Violeta Georgieva <miles...@gmail.com>
Subject High memory consumption caused by BLOCKED Threads
Date Thu, 22 Dec 2011 09:05:25 GMT
Hi,

I am using Tomcat 6.0.29 and SUN JVM.
I experience high memory consumption caused by BLOCKED Threads.

I would appreciate any help or suggestion how to solve the problem.

I can see the following in the thread dump:


"http-8080-73" daemon prio=10 tid=0x00007ff9a4586000 nid=0x7d3 waiting for
monitor entry [0x00007ff9996d4000]

   java.lang.Thread.State: BLOCKED (on object monitor)

               at
sun.util.resources.TimeZoneNames.getContents(TimeZoneNames.java:185)

               at
sun.util.resources.OpenListResourceBundle.loadLookup(OpenListResourceBundle.java:109)

               - locked <0x00000006f95a49b8> (a
sun.util.resources.TimeZoneNames)

               at
sun.util.resources.OpenListResourceBundle.loadLookupTablesIfNecessary(OpenListResourceBundle.java:97)

               at
sun.util.resources.OpenListResourceBundle.handleGetObject(OpenListResourceBundle.java:58)

               at
sun.util.resources.TimeZoneNamesBundle.handleGetObject(TimeZoneNamesBundle.java:59)

               at
java.util.ResourceBundle.getObject(ResourceBundle.java:368)

               at
java.util.ResourceBundle.getObject(ResourceBundle.java:371)

               at
java.util.ResourceBundle.getStringArray(ResourceBundle.java:351)

               at
sun.util.TimeZoneNameUtility.retrieveDisplayNames(TimeZoneNameUtility.java:100)

               at
sun.util.TimeZoneNameUtility.retrieveDisplayNames(TimeZoneNameUtility.java:81)

               at java.util.TimeZone.getDisplayNames(TimeZone.java:399)

               at java.util.TimeZone.getDisplayName(TimeZone.java:350)

               at
java.text.SimpleDateFormat.subFormat(SimpleDateFormat.java:1110)

               at
java.text.SimpleDateFormat.format(SimpleDateFormat.java:899)

               at
java.text.SimpleDateFormat.format(SimpleDateFormat.java:869)

               at java.text.DateFormat.format(DateFormat.java:316)

               at
org.apache.tomcat.util.http.FastHttpDateFormat.getCurrentDate(FastHttpDateFormat.java:115)

               - locked <0x00000006fbd04ee8> (a java.text.SimpleDateFormat)

               at
org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1606)

               at
org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:956)

               at org.apache.coyote.Response.action(Response.java:183)

               at org.apache.coyote.Response.sendHeaders(Response.java:379)

               at
org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305)

               at
org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:273)

               at
org.apache.catalina.connector.Response.finishResponse(Response.java:493)

               at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:322)

               at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)

               at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)

               at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

               at java.lang.Thread.run(Thread.java:662)



Line 2485 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2536 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2625 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2660 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2703 :          - locked <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2741 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2758 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2775 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2792 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2848 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2865 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2891 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2908 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2925 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2942 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2959 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2976 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 2993 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3010 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3027 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3044 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3061 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3094 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3111 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3128 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3145 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3180 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3197 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3214 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3231 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3248 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3265 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3282 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3299 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3316 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3333 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3350 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3367 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3384 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3401 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3418 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3435 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3452 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3487 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3513 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3530 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3547 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3564 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3608 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3756 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3860 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3877 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 3894 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)

Line 4324 :          - waiting to lock <0x00000006fbd04ee8> (a
java.text.SimpleDateFormat)



Thanks in advance

Violeta

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