Note: This command is experimental and unsupported.
jmap [options] pid
This represents the
jmapcommand-line options. See Options for the jmap Command.
The process ID for which the information specified by the options is to be printed. The process must be a Java process. To get a list of Java processes running on a machine, use either the
pscommand or, if the JVM processes are not running in a separate docker instance, the jps command.
jmap command prints details of a specified running process.
This command is unsupported and might not be available in future releases of the JDK. On Windows Systems where the
dbgeng.dll file isn't present, the Debugging Tools for Windows must be installed to make these tools work. The
PATH environment variable should contain the location of the
jvm.dll file that's used by the target process or the location from which the core dump file was produced.
Options for the Jmap Command
- -clstats pid
Connects to a running process and prints class loader statistics of Java heap.
- -finalizerinfo pid
Connects to a running process and prints information on objects awaiting finalization.
- -histo[:live] pid
Connects to a running process and prints a histogram of the Java object heap. If the
livesuboption is specified, it then counts only live objects.
- -dump:dump_options pid
Connects to a running process and dumps the Java heap. The dump_options include:
live--- When specified, dumps only the live objects; if not specified, then dumps all objects in the heap.
format=b--- Dumps the Java heap in
file=filename --- Dumps the heap to filename