jhat man page on Kali

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jhat(1)			     Troubleshooting Tools		       jhat(1)

NAME
       jhat - Analyzes the Java heap. This command is experimental and
       unsupported.

SYNOPSIS
       jhat [ options ] heap-dump-file

       options
	      The command-line options. See Options.

       heap-dump-file
	      Java binary heap dump file to be browsed. For a dump file that
	      contains multiple heap dumps, you can specify which dump in the
	      file by appending #<number> to the file name, for example,
	      myfile.hprof#3.

DESCRIPTION
       The jhat command parses a Java heap dump file and starts a web server.
       The jhat command lets you to browse heap dumps with your favorite web
       browser. The jhat command supports predesigned queries such as show all
       instances of a known class MyClass, and Object Query Language (OQL).
       OQL is similar to SQL, except for querying heap dumps. Help on OQL is
       available from the OQL help page shown by the jhat command. With the
       default port, OQL help is available at http://localhost:7000/oqlhelp/

       There are several ways to generate a Java heap dump:

       · Use the jmap -dump option to obtain a heap dump at runtime. See
	 jmap(1).

       · Use the jconsole option to obtain a heap dump through
	 HotSpotDiagnosticMXBean at runtime. See jconsole(1) and the
	 HotSpotDiagnosticMXBean interface description at
	 http://docs.oracle.com/javase/8/docs/jre/api/management/extension/com/sun/management/HotSpotDiagnosticMXBean.html

       · Heap dump is generated when an OutOfMemoryError is thrown by
	 specifying the -XX:+HeapDumpOnOutOfMemoryError Java Virtual Machine
	 (JVM) option.

       · Use the hprof command. See the HPROF: A Heap/CPU Profiling Tool at
	 http://docs.oracle.com/javase/8/docs/technotes/samples/hprof.html

OPTIONS
       -stack false|true
	      Turns off tracking object allocation call stack. If allocation
	      site information is not available in the heap dump, then you
	      have to set this flag to false. The default is true.

       -refs false|true
	      Turns off tracking of references to objects. Default is true. By
	      default, back pointers, which are objects that point to a
	      specified object such as referrers or incoming references, are
	      calculated for all objects in the heap.

       -port port-number
	      Sets the port for the jhat HTTP server. Default is 7000.

       -exclude exclude-file
	      Specifies a file that lists data members that should be excluded
	      from the reachable objects query. For example, if the file lists
	      java.lang.String.value, then, then whenever the list of objects
	      that are reachable from a specific object o are calculated,
	      reference paths that involve java.lang.String.value field are
	      not considered.

       -baseline exclude-file
	      Specifies a baseline heap dump. Objects in both heap dumps with
	      the same object ID are marked as not being new. Other objects
	      are marked as new. This is useful for comparing two different
	      heap dumps.

       -debug int
	      Sets the debug level for this tool. A level of 0 means no debug
	      output. Set higher values for more verbose modes.

       -version
	      Reports the release number and exits

       -h
	      Dsiplays a help message and exits.

       -help
	      Displays a help message and exits.

       -Jflag
	      Passes flag to the Java Virtual Machine on which the jhat
	      command is running. For example, -J-Xmx512m to use a maximum
	      heap size of 512 MB.

SEE ALSO
       · jmap(1)

       · jconsole(1)

       · HPROF: A Heap/CPU Profiling Tool at
	 http://docs.oracle.com/javase/8/docs/technotes/samples/hprof.html

JDK 8			       21 November 2013			       jhat(1)
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