Java code to access the shared heap Post: 302361407

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Top Forums Programming Java code to access the shared heap Post 302361407 by frustrated1 on Tuesday 13th of October 2009 06:29:35 AM

10-13-2009

Registered User

Java code to access the shared heap

Hi

Help needed and forgive me as I dont know Java so please bare with me.
I have searched this site and google but was unable to locate the information I need.

An application that we use - is based on java and stores some performance counters etc internally in the shared JVM. They are not held in an oracle db etc

What I want to be able to do is access the shared area in JVM and write out the contents, I am not 100% sure how the counters are stored etc so I would need to access the entire JVM memory and write it to a file on the unix filesystem assuming thats even possible..

Can you help? Smilie

Server information:
java version "1.4.2_10"
Solaris 10

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jsadebugd(1)						      General Commands Manual						      jsadebugd(1)

NAME

       jsadebugd - serviceability agent debug daemon

SYNOPSIS

       jsadebugd [pid] [server-id]
       jsadebugd executable core [server-id]

DESCRIPTION

       jsadebugd  attaches to a Java process or core file and acts as a debug server. Remote clients such as jstack, jmap, and jinfo can attach to
       the server using Java Remote Method Invocation (RMI). Before starting jsadebugd, rmiregistry must be started with:

	      rmiregistry -J-Xbootclasspath/p:$JAVA_HOME/lib/sajdi.jar

       where $JAVA_HOME is the J2SE SDK installation directory.  If rmiregistry was not started, jsadebugd will start an rmiregistry in a standard
       (1099) port internally. Debug server may be stopped by sending SIGINT (pressing Ctrl-C) to it.

       NOTE - This utility is unsupported and may or may not be available in future versions of the J2SE SDK.  jinfo is not currently available on
       Windows platforms or on the Linux Itanium platform.

PARAMETERS

       pid	      process id of the process to which the debug server should attach. The process must be a Java process. To get a list of Java
		      processes  running  on  a  machine,  jps	may be used.  At most one instance of the debug server may be attached to a single
		      process.

       executable     Java executable from which the core dump was produced.

       core	      core file to which the debug server should attach.

       server-id      optional unique id, needed if multiple debug servers are started on the same machine. This ID must be used by remote clients
		      to identify the particular debug server to attach. Within a single machine, this ID must be unique.

SEE ALSO

       jinfo(1) jmap(1) jps(1) jstack(1) rmiregistry(1)

								   13 June 2004 						      jsadebugd(1)