The jinfo Command

Name

jinfo - generate Java configuration information for a specified Java process

Synopsis

Note: This command is experimental and unsupported.

jinfo [option] pid

option

This represents the jinfo command-line options. See Options for the jinfo Command.

pid

The process ID for which the configuration information 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 ps command or, if the JVM processes are not running in a separate docker instance, the jps command.

Note: JDK 10 has added support for using the Attach API when attaching to Java processes running in a separate docker process. However, the jps 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 ps to look up the PID of the JVM.

Description

The jinfo command prints Java configuration information for a specified Java process. The configuration information includes Java system properties and JVM command-line flags. If the specified process is running on a 64-bit JVM, then you might need to specify the -J-d64 option, for example:

jinfo -J-d64 -sysprops pid

This command is unsupported and might not be available in future releases of the JDK. In Windows Systems where dbgeng.dll is not present, the Debugging Tools for Windows must be installed to have these tools work. The PATH environment variable should contain the location of the jvm.dll that's used by the target process or the location from which the core dump file was produced.

Options for the jinfo Command

Note:

If none of the following options are used, both the command-line flags and the system property name-value pairs are printed.

-flag name

Prints the name and value of the specified command-line flag.

-flag [+|-]name

Enables or disables the specified Boolean command-line flag.

-flag name=value

Sets the specified command-line flag to the specified value.

-flags

Prints command-line flags passed to the JVM.

-sysprops

Prints Java system properties as name-value pairs.

-h or -help

Prints a help message.