114 lines
3.8 KiB
Groff
114 lines
3.8 KiB
Groff
.\" Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved.
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.\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.\" This code is free software; you can redistribute it and/or modify it
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.\" published by the Free Software Foundation.
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.\"
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.\" This code is distributed in the hope that it will be useful, but WITHOUT
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.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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.\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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.\" version 2 for more details (a copy is included in the LICENSE file that
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.\" accompanied this code).
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.\"
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.\" You should have received a copy of the GNU General Public License version
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.\" 2 along with this work; if not, write to the Free Software Foundation,
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.\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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.\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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.\" or visit www.oracle.com if you need additional information or have any
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.\" questions.
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.\"
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.\" Automatically generated by Pandoc 2.3.1
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.\"
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.TH "JINFO" "1" "2020" "JDK 14" "JDK Commands"
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.hy
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.SH NAME
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.PP
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jinfo \- generate Java configuration information for a specified Java
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process
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.SH SYNOPSIS
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.PP
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\f[B]Note:\f[R] This command is experimental and unsupported.
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.PP
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\f[CB]jinfo\f[R] [\f[I]option\f[R]] \f[I]pid\f[R]
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.TP
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.B \f[I]option\f[R]
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This represents the \f[CB]jinfo\f[R] command\-line options.
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See \f[B]Options for the jinfo Command\f[R].
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.RS
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.RE
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.TP
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.B \f[I]pid\f[R]
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The process ID for which the configuration information is to be printed.
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The process must be a Java process.
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To get a list of Java processes running on a machine, use either the
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\f[CB]ps\f[R] command or, if the JVM processes are not running in a
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separate docker instance, the \f[B]jps\f[R] command.
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.RS
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.PP
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\f[B]Note:\f[R] JDK 10 has added support for using the Attach API when
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attaching to Java processes running in a separate docker process.
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However, the \f[CB]jps\f[R] command will not list the JVM processes that
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are running in a separate docker instance.
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If you are trying to connect a Linux host with a Virtual Machine that is
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in a docker container, you must use tools such as \f[CB]ps\f[R] to look up
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the PID of the JVM.
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.RE
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.SH DESCRIPTION
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.PP
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The \f[CB]jinfo\f[R] command prints Java configuration information for a
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specified Java process.
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The configuration information includes Java system properties and JVM
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command\-line flags.
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If the specified process is running on a 64\-bit JVM, then you might
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need to specify the \f[CB]\-J\-d64\f[R] option, for example:
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.RS
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.PP
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\f[CB]jinfo\ \-J\-d64\ \-sysprops\f[R] \f[I]pid\f[R]
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.RE
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.PP
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This command is unsupported and might not be available in future
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releases of the JDK.
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In Windows Systems where \f[CB]dbgeng.dll\f[R] is not present, the
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Debugging Tools for Windows must be installed to have these tools work.
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The \f[CB]PATH\f[R] environment variable should contain the location of
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the \f[CB]jvm.dll\f[R] that\[aq]s used by the target process or the
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location from which the core dump file was produced.
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.SH OPTIONS FOR THE JINFO COMMAND
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.PP
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\f[B]Note:\f[R]
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.PP
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If none of the following options are used, both the command\-line flags
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and the system property name\-value pairs are printed.
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.TP
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.B \f[CB]\-flag\f[R] \f[I]name\f[R]
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Prints the name and value of the specified command\-line flag.
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.RS
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.RE
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.TP
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.B \f[CB]\-flag\f[R] [\f[CB]+\f[R]|\f[CB]\-\f[R]]\f[I]name\f[R]
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Enables or disables the specified Boolean command\-line flag.
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.RS
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.RE
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.TP
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.B \f[CB]\-flag\f[R] \f[I]name\f[R]\f[CB]=\f[R]\f[I]value\f[R]
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Sets the specified command\-line flag to the specified value.
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.RS
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.RE
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.TP
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.B \f[CB]\-flags\f[R]
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Prints command\-line flags passed to the JVM.
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.RS
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.RE
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.TP
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.B \f[CB]\-sysprops\f[R]
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Prints Java system properties as name\-value pairs.
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.RS
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.RE
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.TP
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.B \f[CB]\-h\f[R] or \f[CB]\-help\f[R]
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Prints a help message.
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.RS
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.RE
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