jdk

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.TH "JINFO" "1" "2025" "JDK 24-ea" "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[V]jinfo\f[R] [\f[I]option\f[R]] \f[I]pid\f[R]
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.TP
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\f[I]option\f[R]
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This represents the \f[V]jinfo\f[R] command-line options.
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See \f[B]Options for the jinfo Command\f[R].
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.TP
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\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[V]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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.SH DESCRIPTION
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.PP
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The \f[V]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 need
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to specify the \f[V]-J-d64\f[R] option, for example:
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.RS
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.PP
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\f[V]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[V]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[V]PATH\f[R] environment variable should contain the location of
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the \f[V]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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\f[V]-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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.TP
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\f[V]-flag\f[R] [\f[V]+\f[R]|\f[V]-\f[R]]\f[I]name\f[R]
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Enables or disables the specified Boolean command-line flag.
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.TP
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\f[V]-flag\f[R] \f[I]name\f[R]\f[V]=\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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.TP
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\f[V]-flags\f[R]
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Prints command-line flags passed to the JVM.
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.TP
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\f[V]-sysprops\f[R]
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Prints Java system properties as name-value pairs.
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.TP
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\f[V]-h\f[R] or \f[V]-help\f[R]
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Prints a help message.
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