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jstack – Prints Java thread stack traces for a Java process, core file,
or remote debug server. This command is experimental and unsupported.


jstack [ options ] pid

jstack [ options ] executable core

jstack [ options ] [ server-id@ ] remote-hostname-or-IP

The command-line options. See Options.

pid The process ID for which the stack trace is printed. The process
must be a Java process. To get a list of Java processes running
on a machine, use the jps command.

The Java executable from which the core dump was produced.

core The core file for which the stack trace is to be printed.

The remote debug server hostname or IP address. See

An optional unique ID to use when multiple debug servers are
running on the same remote host.


The jstack command prints Java stack traces of Java threads for a
specified Java process, core file, or remote debug server. For each
Java frame, the full class name, method name, byte code index (BCI),
and line number, when available, are printed. With the -m option, the
jstack command prints both Java and native frames of all threads with
the program counter (PC). For each native frame, the closest native
symbol to PC, when available, is printed. C++ mangled names are not
demangled. To demangle C++ names, the output of this command can be
piped to c++filt. When the specified process is running on a 64-bit
Java Virtual Machine, you might need to specify the -J-d64 option, for
example: jstack -J-d64 -m pid.

Note: This utility is unsupported and might not be available in future
release of the JDK. In Windows Systems where the dbgeng.dll file is not
present, Debugging Tools For Windows must be installed so these tools
work. The PATH environment variable needs to contain the location of
the jvm.dll that is used by the target process, or the location from
which the crash dump file was produced. For example:

set PATH=\jre\bin\client;%PATH%


Force a stack dump when jstack [-l] pid does not respond.

Long listing. Prints additional information about locks such as
a list of owned java.util.concurrent ownable synchronizers. See
the AbstractOwnableSynchronizer class description at

Prints a mixed mode stack trace that has both Java and native
C/C++ frames.

Prints a help message.

Prints a help message.



In mixed mode stack trace, the -m option does not work with the remote
debug server.


· pstack(1)

· C++filt(1)

· jps

· jsadebugd

JDK 8 21 November 2013 jstack

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What Is On My Threads – Debugging Java Using JStack | A posteriori