Re: Java freezing at 100% usage, tomcat 5, java 5

[Alexey Solofnenko]

I do not know the answer. A similar behaviour happened with our servers when finilizer dead-locked. In your case Finilizer did not dead-lock, but it fails with exception and I do not know if it recovers after that. Try checking stack trace several times in a row and see what the finilizer does.

at java.lang.Throwable.getStackTraceElement(Native Method)
at java.lang.Throwable.getOurStackTrace(Throwable.java:592)
- locked <0x792bef30> (a java.net.SocketException)
at java.lang.Throwable.printStackTrace(Throwable.java:511)
- locked <0x792bf368> (a java.io.PrintWriter)
at com.mysql.jdbc.Util.stackTraceToString(Util.java:291)

at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2723)
at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1401)
at com.mysql.jdbc.Connection.realClose(Connection.java:4882)
at com.mysql.jdbc.Connection.cleanup(Connection.java:2062)
at com.mysql.jdbc.Connection.finalize(Connection.java:3369)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)


- Alexey.

Jimmy Phelan :: Blacknight Solutions wrote:

"Finalizer" daemon prio=1 tid=0x0809d908 nid=0x4834 waiting for monitor entry [0xb24a1000..0xb24a1ea0] at com.mysql.jdbc.CommunicationsException.<init>(CommunicationsException.java:186)

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Hi All



I have attached a stack trace (from kill -3)





Tomcat 5 has the following variables enables in its process









Jimmy

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We are using tomcat 5 on a shared hosting server. The server is running DirectAdmin as its control panel. It is running RedHat Enterprise 4, tomcat 5.5.23 and jvm 1.5.0_08-b03 We are using a plugin from da-plugin.com to use tomcat in DirectAdmin, but the support on this is less than stellar, and we don’t believe it to be the issue What seems to be happening is that every now and again the java process jumps to 100% usage, and sticks. Only a service tomcatd restart will kill it and restart the server -Xmx512M -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.endorsed.dirs=/usr/local/tomcat/common/endorsed -classpath :/usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/commons-logging-api.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start We are also running tomcat-4 in tandem with tomcat 5, it runs with the following variables -Djava.endorsed.dirs=/usr/local/tomcat.4.1.33/common/endorsed -classpath /usr/local/java/lib/tools.jar:/usr/local/tomcat.4.1.33/bin/bootstrap.jar -Dcatalina.base=/usr/local/tomcat.4.1.33 -Dcatalina.home=/usr/local/tomcat.4.1.33 -Djava.io.tmpdir=/usr/local/tomcat.4.1.33/temp org.apache.catalina.startup.Bootstrap start We have been trying to sort this out for a while, but cant see anything, can anyone else?

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Alexey N. Solofnenko <http://trelony.cjb.net/>
Pleasant Hill, CA (GMT-8 usually)

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