On 12/22/2011 4:05 AM, Violeta Georgieva wrote:
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.
Fix your app so that it releases the locks (probably synchronized
sections) on the SimpleDateFormat objects.
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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