JDK14/Java14源码在线阅读

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.TH "JINFO" "1" "2020" "JDK 14" "JDK Commands"
.hy
.SH NAME
.PP
jinfo \- generate Java configuration information for a specified Java
process
.SH SYNOPSIS
.PP
\f[B]Note:\f[R] This command is experimental and unsupported.
.PP
\f[CB]jinfo\f[R] [\f[I]option\f[R]] \f[I]pid\f[R]
.TP
.B \f[I]option\f[R]
This represents the \f[CB]jinfo\f[R] command\-line options.
See \f[B]Options for the jinfo Command\f[R].
.RS
.RE
.TP
.B \f[I]pid\f[R]
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
\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]jinfo\f[R] 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 \f[CB]\-J\-d64\f[R] option, for example:
.RS
.PP
\f[CB]jinfo\ \-J\-d64\ \-sysprops\f[R] \f[I]pid\f[R]
.RE
.PP
This command is unsupported and might not be available in future
releases of the JDK.
In Windows Systems where \f[CB]dbgeng.dll\f[R] is not present, the
Debugging Tools for Windows must be installed to have these tools work.
The \f[CB]PATH\f[R] environment variable should contain the location of
the \f[CB]jvm.dll\f[R] that\[aq]s used by the target process or the
location from which the core dump file was produced.
.SH OPTIONS FOR THE JINFO COMMAND
.PP
\f[B]Note:\f[R]
.PP
If none of the following options are used, both the command\-line flags
and the system property name\-value pairs are printed.
.TP
.B \f[CB]\-flag\f[R] \f[I]name\f[R]
Prints the name and value of the specified command\-line flag.
.RS
.RE
.TP
.B \f[CB]\-flag\f[R] [\f[CB]+\f[R]|\f[CB]\-\f[R]]\f[I]name\f[R]
Enables or disables the specified Boolean command\-line flag.
.RS

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