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.TH "JSTACK" "1" "2018" "JDK 13" "JDK Commands"
.hy
.SH NAME
.PP
jstack \- print Java stack traces of Java threads for a specified Java
process
.SH SYNOPSIS
.PP
\f[B]Note:\f[R] This command is experimental\ and unsupported.
.PP
\f[CB]jstack\f[R] [\f[I]options\f[R]] \f[I]pid\f[R]
.TP
.B \f[I]options\f[R]
This represents the \f[CB]jstack\f[R] command\-line options.
See \f[B]Options for the jstack Command\f[R].
.RS
.RE
.TP
.B \f[I]pid\f[R]
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 either the
\f[CB]ps\f[R] command or, if the JVM processes are not running in a
separate docker instance, the \f[B]jps\f[R] command.
.RS
.PP
\f[B]Note:\f[R] JDK 10 has added support for using the Attach API when
attaching to Java processes running in a separate docker process.
However, the \f[CB]jps\f[R] command will not list the JVM processes that
are running in a separate docker instance.
If you are trying to connect a Linux host with a Virtual Machine that is
in a docker container, you must use tools such as \f[CB]ps\f[R] to look up
the PID of the JVM.
.RE
.SH DESCRIPTION
.PP
The \f[CB]jstack\f[R] command prints Java stack traces of Java threads for
a specified Java process.
For each Java frame, the full class name, method name, byte code index
(BCI), and line number, when available, are printed.
C++ mangled names aren\[aq]t demangled.
To demangle C++ names, the output of this command can be piped to
\f[CB]c++filt\f[R].
When the specified process is running on a 64\-bit JVM, you might need
to specify the \f[CB]\-J\-d64\f[R] option, for example:
\f[CB]jstack\ \-J\-d64\f[R] \f[I]pid\f[R].
.PP
\f[B]Note:\f[R]
.PP
This command is unsupported and might not be available in future
releases of the JDK.
In Windows Systems where the \f[CB]dbgeng.dll\f[R] file isn\[aq]t present,
the Debugging Tools for Windows must be installed so that these tools
work.
The \f[CB]PATH\f[R] environment variable needs to contain the location of
the \f[CB]jvm.dll\f[R] that is used by the target process, or the location
from which the core dump file was produced.
.SH OPTIONS FOR THE JSTACK COMMAND
.TP
.B \f[CB]\-l\f[R]
The long listing option prints additional information about locks.
.RS
.RE
.TP
.B \f[CB]\-h\f[R] or \f[CB]\-help\f[R]
Prints a help message.
.RS
.RE