Java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)

Hi
We are getting problem of high cpu usage by j2ee engine. It happened 4-5 times in day. As per oss note 743204, 710154, i have created the thread dump in last 3-4 days and for the following logs:
"Finalizer" daemon prio=10 tid=60000000010a9bd0 nid=10 lwp_id=1310724 runnable [0x9ffffffee748c000..0x9ffffffee748ccf0]
        at java.net.PlainSocketImpl.socketClose0(Native Method)
        at java.net.PlainSocketImpl.socketPreClose(PlainSocketImpl.java:619)
        at java.net.PlainSocketImpl.close(PlainSocketImpl.java:454)
        - locked <9ffffffef2068100> (a java.lang.Object)
        at java.net.PlainSocketImpl.finalize(PlainSocketImpl.java:520)
        at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
        at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:98)
        at java.lang.ref.Finalizer.access$100(Finalizer.java:15)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)
"Finalizer" daemon prio=10 tid=6000000001089bd0 nid=10 lwp_id=1490796 runnable [0x9ffffffee748c000..0x9ffffffee748ccf0]
        at java.net.PlainSocketImpl.socketClose0(Native Method)
        at java.net.PlainSocketImpl.socketPreClose(PlainSocketImpl.java:619)
        at java.net.PlainSocketImpl.close(PlainSocketImpl.java:454)
        - locked <9ffffffef2051770> (a java.lang.Object)
        at java.net.PlainSocketImpl.finalize(PlainSocketImpl.java:520)
        at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
        at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:98)
        at java.lang.ref.Finalizer.access$100(Finalizer.java:15)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)
Each time dump give the same information as mentioned above.
Pls suggest to resolve problem.
we are on support pack 20. Here XI is on HP-Unix with Oracle database.
Sometime, when cpu capture 99% of resources, we get the error code "Error Code: MAPPING.JCO_SYSTEM_FAILURE"
Not sure if High CPU usage is the cause of the Mapping JCo error.
Thanks
Amar

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"Ratan" <[email protected]> wrote:
>
>
>
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[NAME] (FONT)
[NAME] (FACE)
E7E00">
<FONT FACE=e <-- bad character
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException:
Error
at line:
8 col:13 Line:8 ''' expected, got char[72]
at weblogic.xml.babel.baseparser.SAXElementFactory.createSAXParseException(SAXEle
mentFactory.java:60)
at weblogic.xml.babel.parsers.StreamParser.streamParseSome(StreamParser.java:130)
at weblogic.xml.babel.parsers.BabelXMLEventStream.parseSome(BabelXMLEventStream.j
ava:46)
at weblogicx.xml.stream.XMLEventStreamBase.hasNext(XMLEventStreamBase.java:135)
at weblogicx.xml.stream.XMLEventStreamBase.hasStartElement(XMLEventStreamBase.jav
a:258)
at weblogicx.xml.stream.XMLEventStreamBase.hasStartElement(XMLEventStreamBase.jav
a:171)
at weblogicx.xml.stream.XMLEventStreamBase.startElement(XMLEventStreamBase.java:1
64)
at weblogic.soap.codec.SoapMessage.read(SoapMessage.java:86)
at weblogic.soap.WebServiceProxy.receive(WebServiceProxy.java:464)
at weblogic.soap.WebServiceProxy.invoke(WebServiceProxy.java:430)
at weblogic.soap.SoapMethod.invoke(SoapMethod.java:186)
at weblogic.soap.wsdl.WebServiceInvocationHandler.invoke(WebServiceInvocationHand
ler.java:31)
at $Proxy0.getProducerName(Unknown Source)
at WSClient.main(WSClient.java:27)

Java.lang.ref.SoftReference problems

All -
I'm having some trouble implementing a cache that can grow+shrink dependent on the available system memory and am using SoftReference objects to do this, as per the javadoc. However, I notice that the SoftReferences are not preventing my referent Objects from being GC-ed even though System memory is NOT running low at all. I noticed a bug http://developer.java.sun.com/developer/bugParade/bugs/4471453.html that seems to indicate that it might be problems with a large heap, but I have set my VM options -Xms256m -Xmx512m. Also using -verbose:gc I have noticed that the garbage collection is happening when there is plenty of free memory (85%).
Has anyone else used SoftReferences (I'm using WebSphere 3.5 fixpack3) and found any problems like this?
Thanks

>
This is from the JDK1.3 javadoc:
<<All soft references to softly-reachable objects are
guaranteed to have been cleared before the virtual
machine throws an OutOfMemoryError. Otherwise no
constraints are placed upon the time at which a soft
reference will be cleared or the order in which a set
of such references to different objects will be
cleared. Virtual machine implementations are, however,
encouraged to bias against clearing recently-created
or recently-used soft references. >>
So it is only an encouragement, not a demand...
perhaps that is the problem?True - but the JVM we are using is 1.2.2_05a on Solaris. One might expect that the reference implementation of the JVM (ie. Sun's) does what Java encourages JVM implementations to do! Also many of the bug-parade posts were actually indicating the opposite behaviour, that is that referents were NOT being GC-ed before an OutOfMemoryError occurs. I thought that maybe using some combination of VM parameters might solve my problem.
Is there anyone from Sun who can enlighten us?

Finalizer Thread - java.lang.rOperating System

Can anyone please help me understand what is being conveyed by the finalizer portion of a thread dump:
"Finalizer" (TID:0x1669320, sys_thread_t:0x592180, state:CW, native ID:0xe6) prio=8
     at java.lang.Object.wait(Native Method)
     at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java, Compiled Code)
     at java.lang.rOperating System: Windows NT Version 4.0
I have been unsuccessful in finding any information on how java.lang.rOperating System comes into play. When our finalizer thread looks like this within the thread dump, the Reference Handler and Signal Dispatcher threads do not appear at all within the dump. The thread dump is from a web application using JRun with IIS serving the web pages.
Thanks,
Kim

Can anyone please help me understand what is being
conveyed by the finalizer portion of a thread dump:
"Finalizer" (TID:0x1669320, sys_thread_t:0x592180,
state:CW, native ID:0xe6) prio=8
at java.lang.Object.wait(Native Method)
at
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.jav
, Compiled Code)
at java.lang.rOperating System: Windows NT Version
4.0
I have been unsuccessful in finding any information on
how java.lang.rOperating System comes into play. When
our finalizer thread looks like this within the thread
dump, the Reference Handler and Signal Dispatcher
threads do not appear at all within the dump. The
thread dump is from a web application using JRun with
IIS serving the web pages.
Thanks,
KimThis portion of the thread dump is corrupted. The finalizer thread dump should normally look something this assuming you didn't catch it in the middle of things:
"Finalizer" daemon prio=8 tid=0xe1010 nid=0x7 waiting on monitor [0xfdd81000..0xfdd819e0]
     at java.lang.Object.wait(Native Method)
     at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:149)
     at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
     at java.lang.ref.Finalizer$FinalizerWorker$FinalizerThread.run(Finalizer.java:120)
Which version of Java are you running? (use java -version)
Chuck

Java Thread run some day then death ,use jstack check it,it run again, is

hi all;
I write a java program run as linux daemon,
command line is >nohup java myclass &>/dev/null
it run some day ,then death, ,look like death lock ,but thread not exit
if i use jstack checke it ,it run again!
my env is
Linux version 2.4.20 ,redhat linux
jstack 14616
Attaching to process ID 14616, please wait...
Debugger attached successfully.
Client compiler detected.
JVM version is 1.5.0_02-b09
my program like
commandline nohuo java StartUp >/dev/null &
public Class StartUp{
public static void main(String[] argv){
   Connection con = getDBConnection
     Thread t1 = new Thread(new MyRun(con));
t1.start();
     Thread t2 = new Thread(new MyRun(con));
t2.start();
for(;;){
Thread.sleep(100);
public class MyRun implements Runnable{
Connection con;
public MyRun(Connection c){con = c;}
public void run(){
     for(;;){
     object = readData(con);
     process(object);
     log.info("watch info ....");
     Thread.sleep(500);
}

Today i found my program hang, i use kill -SIGQUIT to print thead trace
but i can't find the bug,after send singal ,the thread run again!
another question
how to detect a thread is hang?and use another thread restart it?
thread dump
Full thread dump Java HotSpot(TM) Client VM (1.5.0_02-b09 mixed mode, sharing):
"pool-1-thread-2" prio=1 tid=0x08447858 nid=0x5aa6 waiting on condition [0x4680f000..0x4681021c]
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:118)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1772)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:359)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:470)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:674)
at java.lang.Thread.run(Thread.java:595)
"pool-1-thread-1" prio=1 tid=0x08392740 nid=0x5aa5 waiting on condition [0x4678f000..0x4678ff1c]
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:118)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1772)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:359)
at com.ejet.mms.MmsSend.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
"Low Memory Detector" daemon prio=1 tid=0x080a18b0 nid=0x5a9f runnable [0x00000000..0x00000000]
"CompilerThread0" daemon prio=1 tid=0x080a0360 nid=0x5a9e waiting on condition [0x00000000..0x417e2c04]
"Signal Dispatcher" daemon prio=1 tid=0x0809f478 nid=0x5a9d waiting on condition [0x00000000..0x00000000]
"Finalizer" daemon prio=1 tid=0x080989e8 nid=0x5a9c in Object.wait() [0x413e4000..0x413e441c]
at java.lang.Object.wait(Native Method)
- waiting on <0x66c18420> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
- locked <0x66c18420> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=1 tid=0x08097cf8 nid=0x5a9b in Object.wait() [0x41364000..0x4136451c]
at java.lang.Object.wait(Native Method)
- waiting on <0x66c184a0> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:474)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <0x66c184a0> (a java.lang.ref.Reference$Lock)
"main" prio=1 tid=0x0805ae68 nid=0x5a98 waiting on condition [0xbfffc000..0xbfffc4f8]
at java.lang.Thread.sleep(Native Method)
at com.ejet.mms.MmsStartup.main(Unknown Source)
"VM Thread" prio=1 tid=0x08095218 nid=0x5a9a runnable
"VM Periodic Task Thread" prio=1 tid=0x080a2d40 nid=0x5aa0 waiting on condition

Java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)

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