Documentation Contents

jstack - Stack Trace

SYNOPSIS

jstack [ option ] pid
jstack [ option ] executable core
jstack [ option ] [server-id@]remote-hostname-or-IP

PARAMETERS

Options are mutually exclusive. Option, if used, should follow immediately after the command name. See OPTIONS.

pid
process id for which the stack trace is to be printed. The process must be a Java process. To get a list of Java processes running on a machine, jps may be used.
executable
Java executable from which the core dump was produced.

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

remote-hostname-or-IP
remote debug server's (see jsadebugd) hostname or IP address.

server-id
optional unique id, if multiple debug servers are running on the same remote host.

DESCRIPTION

jstack prints Java stack traces of Java threads for a given Java process or core file or a remote debug server. For each Java frame, the full class name, method name, 'bci' (byte code index) and line number, if available, are printed. With the -m option, jstack prints both Java and native frames of all threads along with the 'pc' (program counter). For each native frame, the closest native symbol to 'pc', if available, is printed. C++ mangled names are not demangled. To demangle C++ names, the output of this command may be piped to c++filt. If the given process is running on a 64-bit VM, you may need to specify the -J-d64 option, e.g.:

jstack -J-d64 -m pid

NOTE - This utility is unsupported and may or may not be available in future versions of the JDK. In Windows Systems where dbgeng.dll is not present, 'Debugging Tools For Windows' needs to be installed to have these tools working. Also, PATH environment variable should contain the location of jvm.dll used by the target process or the location from which the Crash Dump file was produced.

For example, set PATH=<jdk>\jre\bin\client;%PATH%

OPTIONS

-F
Force a stack dump when 'jstack [-l] pid' does not respond.
-l
Long listing. Prints additional information about locks such as list of owned java.util.concurrent ownable synchronizers.
-m
prints mixed mode (both Java and native C/C++ frames) stack trace.
-h
prints a help message.

-help
prints a help message

SEE ALSO

KNOWN BUGS

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

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