utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&.
.if n \{\
.sp
.SH DESCRIPTION
The \f3jcmd\fR utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&.
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.TS
allbox tab(:);
l.
T{
.PP
To invoke diagnostic commands from a remote machine or with different identifiers, you can use the
interface, see the API documentation at http://docs\&.oracle\&.com/javase/8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html
T}
.TE
.sp 1
.sp .5v
.RE
.PP
\fINote:\fR To invoke diagnostic commands from a remote machine or with different identiers, you can use the \f3com\&.sun\&.management\&.DiagnosticCommandMBean\fR interface\&. For more information about the \f3DiagnosticCommandMBean\fR interface, see the API documentation at http://download\&.java\&.net/jdk8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html
If you run
\fBjcmd\fR
without arguments or with the
\fB\-l\fR
option, it prints the list of running Java process identifiers with the main class and command\-line arguments that were used to launch the process\&. Running
\fBjcmd\fR
with the
\fB\-h\fR
or
\fB\-help\fR
option prints the tool\(cqs help message\&.
.PP
If you run \f3jcmd\fR without arguments or with the \f3-l\fR option, it prints the list of running Java process identifiers with the main class and command-line arguments that were used to launch the process\&. Running \f3jcmd\fR with the \f3-h\fR or \f3-help\fR option prints the tool\(cqs help message\&.
If you specify the processes identifier (\fIpid\fR) or the main class (\fImain\-class\fR) as the first argument,
\fBjcmd\fR
sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying
\fB0\fR
as the process identifier\&. Use one of the following as the diagnostic command request:
.PP
If you specify the processes identifier (\fIpid\fR) or the main class (\fImain-class\fR) as the first argument, \f3jcmd\fR sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying \f30\fR as the process identifier\&. Use one of the following as the diagnostic command request:
.TP
Perfcounter\&.print
.RS 4
Prints the performance counters available for the specified Java process\&. The list of performance counters might vary with the Java process\&.
.TP
-f \fIfilename\fR
.br
The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the \f3-f\fR option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&.
.TP
.RE
.PP
\-f \fIfilename\fR
.RS 4
The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the
\fB\-f\fR
option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the
\fBstop\fR
keyword is read\&.
.RE
.PP
\fIcommand\fR [\fIarguments\fR]
The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the \f3help\fR command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the \f3help\fR command\&.
\fINote:\fR If any arguments contain spaces, you must surround them with single or double quotation marks (\f3\&'\fR or \f3"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\f3\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&.
.SH OPTIONS
.RS 4
The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the
\fBhelp\fR
command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the
\fBhelp\fR
command\&.
.sp
\fBNote:\fR
If any arguments contain spaces, you must surround them with single or double quotation marks (\fB\*(Aq\fR
or
\fB"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\fB\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&.
.RE
.SH "OPTIONS"
.PP
Options are mutually exclusive\&.
.TP
-f \fIfilename\fR
.br
Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&.
.TP
-h, -help
.PP
\-f \fIfilename\fR
.RS 4
Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the
\fBstop\fR
keyword is read\&.
.RE
.PP
\-h
.br
\-help
.RS 4
Prints a help message\&.
.TP
-l
.br
Prints the list of running Java processes identifiers with the main class and command-line arguments\&.
.SH SEE\ ALSO
.TP 0.2i
\(bu
.RE
.PP
\-l
.RS 4
Prints the list of running Java processes identifiers with the main class and command\-line arguments\&.
One or more options of the \f3jjs\fR command, separated by spaces\&. For more information, see Options\&.
.TP
\fIscript-files\fR
.RS 4
One or more options of the
\fBjjs\fR
command, separated by spaces\&. For more information, see Options\&.
.RE
.PP
\fIscript\-files\fR
.RS 4
One or more script files which you want to interpret using Nashorn, separated by spaces\&. If no files are specified, an interactive shell is started\&.
.TP
.RE
.PP
\fIarguments\fR
All values after the double hyphen marker (\f3--\fR) are passed through to the script or the interactive shell as arguments\&. These values can be accessed by using the \f3arguments\fR property (see )\&.
.SH DESCRIPTION
The \f3jjs\fR command-line tool is used to invoke the Nashorn engine\&. You can use it to interpret one or several script files, or to run an interactive shell\&.
.SH OPTIONS
The options of the \f3jjs\fR command control the conditions under which scripts are interpreted by Nashorn\&.
.TP
-ccs=\fIsize\fR , --class-cache-size=\fIsize\fR
.br
Sets the class cache size (in bytes)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes (KB), \f3m\fR or \f3M\fR to indicate megabytes (MB), \f3g\fR or \f3G\fR to indicate gigabytes (GB)\&. By default, the class cache size is set to 50 bytes\&. The following example shows how to set it to 1024 bytes (1 KB):
.sp
.nf
\f3\-css=100\fP
.fi
.nf
\f3\-css=1k\fP
.fi
.nf
\f3\fP
.fi
.sp
.TP
-co, --compile-only
.br
Compiles the script without running it\&.
.TP
-cp \fIpath\fR , -classpath \fIpath\fR
.br
.RS 4
All values after the double hyphen marker (\fB\-\-\fR) are passed through to the script or the interactive shell as arguments\&. These values can be accessed by using the
\fBarguments\fR
property (see Example 3)\&.
.RE
.SH "DESCRIPTION"
.PP
The
\fBjjs\fR
command\-line tool is used to invoke the Nashorn engine\&. You can use it to interpret one or several script files, or to run an interactive shell\&.
.SH "OPTIONS"
.PP
The options of the
\fBjjs\fR
command control the conditions under which scripts are interpreted by Nashorn\&.
.PP
\-cp \fIpath\fR
.br
\-classpath \fIpath\fR
.RS 4
Specifies the path to the supporting class files To set multiple paths, the option can be repeated, or you can separate each path with a colon (:)\&.
.TP
-D\fIname\fR=\fIvalue\fR
.br
Sets a system property to be passed to the script by assigning a value to a property name\&. The following example shows how to invoke Nashorn in interactive mode and assign \f3myValue\fR to the property named \f3myKey\fR:
Sets a system property to be passed to the script by assigning a value to a property name\&. The following example shows how to invoke Nashorn in interactive mode and assign
This option can be repeated to set multiple properties\&.
.TP
-d=\fIpath\fR , --dump-debug-dir=\fIpath\fR
.br
Specifies the path to the directory where class files are dumped\&.
.TP
--debug-lines
.br
Generates a line number table in the class file\&. By default, this option is enabled\&. To disable it, specify \f3--debug-lines=false\fR\&.
.TP
--debug-locals
.br
Generates a local variable table in the class file\&.
.TP
-doe, --dump-on-error
.RE
.PP
\-doe
.br
\-\-dump\-on\-error
.RS 4
Provides a full stack trace when an error occurs\&. By default, only a brief error message is printed\&.
.TP
--early-lvalue-error
.br
Reports invalid lvalue expressions as early errors (that is, when the code is parsed)\&. By default, this option is enabled\&. To disable it, specify \f3--early-lvalue-error=false\fR\&. When disabled, invalid lvalue expressions will not be reported until the code is executed\&.
.TP
--empty-statements
.br
Preserves empty statements in the Java abstract syntax tree\&.
.TP
-fv, --fullversion
.RE
.PP
\-fv
.br
\-\-fullversion
.RS 4
Prints the full Nashorn version string\&.
.TP
--function-statement-error
.br
Prints an error message when a function declaration is used as a statement\&.
.TP
--function-statement-warning
.br
Prints a warning message when a function declaration is used as a statement\&.
.TP
-fx
.br
.RE
.PP
\-fx
.RS 4
Launches the script as a JavaFX application\&.
.TP
-h, -help
.RE
.PP
\-h
.br
\-help
.RS 4
Prints the list of options and their descriptions\&.
.TP
-J\fIoption\fR
.br
Passes the specified \f3java\fR launcher option to the JVM\&. The following example shows how to invoke Nashorn in interactive mode and set the maximum memory used by the JVM to 4 GB:
This option can be repeated to pass multiple \f3java\fR command options\&.
.TP
--language=[es5]
.br
.RE
.PP
\-\-language=[es5]
.RS 4
Specifies the ECMAScript language version\&. The default version is ES5\&.
.TP
--lazy-compilation
.br
Enables lazy code generation strategies (that is, the entire script is not compiled at once)\&. This option is experimental\&.
.TP
--loader-per-compile
.br
Creates a new class loader per compile\&. By default, this option is enabled\&. To disable it, specify \f3--loader-per-compile=false\fR\&.
.TP
--log=\fIsubsystem\fR:\fIlevel\fR
.br
Performs logging at a given level for the specified subsystems\&. You can specify logging levels for multiple subsystems separating them with commas\&. For example:
.sp
.nf
\f3\-\-log=fields:finest,codegen:info\fP
.fi
.sp
.TP
--optimistic-types=[true|false]
.RE
.PP
\-ot
.br
\-\-optimistic\-types=[true|false]
.RS 4
Enables or disables optimistic type assumptions with deoptimizing recompilation\&. Running with optimistic types will yield higher final speed, but may increase warmup time\&.
.TP
--package=\fIname\fR
.br
Specifies the package to which generated class files are added\&.
.TP
--parse-only
.br
Parses the code without compiling\&.
.TP
--print-ast
.br
Prints the abstract syntax tree\&.
.TP
--print-code
.br
Prints bytecode\&.
.TP
--print-lower-ast
.br
Prints the lowered abstract syntax tree\&.
.TP
--print-lower-parse
.br
Prints the lowered parse tree\&.
.TP
--print-no-newline
.br
Forces other \f3--print*\fR options to print the output on one line\&.
.TP
--print-parse
.br
Prints the parse tree\&.
.TP
--print-symbols
.br
Prints the symbol table\&.
.TP
-pcs, --profile-callsites
.br
Dumps callsite profile data\&.
.TP
-scripting
.br
.RE
.PP
\-scripting
.RS 4
Enables shell scripting features\&.
.TP
--stderr=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard error stream to the specified file, stream (for example, to \f3stdout\fR), or text terminal\&.
.TP
--stdout=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard output stream to the specified file, stream (for example, to \f3stderr\fR), or text terminal\&.
.TP
-strict
.br
.RE
.PP
\-strict
.RS 4
Enables strict mode, which enforces stronger adherence to the standard (ECMAScript Edition 5\&.1), making it easier to detect common coding errors\&.
.TP
-t=\fIzone\fR , -timezone=\fIzone\fR
.br
Sets the specified time zone for script execution\&. It overrides the time zone set in the OS and used by the \f3Date\fR object\&.
utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&.
.if n \{\
.sp
.SH DESCRIPTION
The \f3jcmd\fR utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&.
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.TS
allbox tab(:);
l.
T{
.PP
To invoke diagnostic commands from a remote machine or with different identifiers, you can use the
interface, see the API documentation at http://docs\&.oracle\&.com/javase/8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html
T}
.TE
.sp 1
.sp .5v
.RE
.PP
\fINote:\fR To invoke diagnostic commands from a remote machine or with different identiers, you can use the \f3com\&.sun\&.management\&.DiagnosticCommandMBean\fR interface\&. For more information about the \f3DiagnosticCommandMBean\fR interface, see the API documentation at http://download\&.java\&.net/jdk8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html
If you run
\fBjcmd\fR
without arguments or with the
\fB\-l\fR
option, it prints the list of running Java process identifiers with the main class and command\-line arguments that were used to launch the process\&. Running
\fBjcmd\fR
with the
\fB\-h\fR
or
\fB\-help\fR
option prints the tool\(cqs help message\&.
.PP
If you run \f3jcmd\fR without arguments or with the \f3-l\fR option, it prints the list of running Java process identifiers with the main class and command-line arguments that were used to launch the process\&. Running \f3jcmd\fR with the \f3-h\fR or \f3-help\fR option prints the tool\(cqs help message\&.
If you specify the processes identifier (\fIpid\fR) or the main class (\fImain\-class\fR) as the first argument,
\fBjcmd\fR
sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying
\fB0\fR
as the process identifier\&. Use one of the following as the diagnostic command request:
.PP
If you specify the processes identifier (\fIpid\fR) or the main class (\fImain-class\fR) as the first argument, \f3jcmd\fR sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying \f30\fR as the process identifier\&. Use one of the following as the diagnostic command request:
.TP
Perfcounter\&.print
.RS 4
Prints the performance counters available for the specified Java process\&. The list of performance counters might vary with the Java process\&.
.TP
-f \fIfilename\fR
.br
The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the \f3-f\fR option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&.
.TP
.RE
.PP
\-f \fIfilename\fR
.RS 4
The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the
\fB\-f\fR
option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the
\fBstop\fR
keyword is read\&.
.RE
.PP
\fIcommand\fR [\fIarguments\fR]
The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the \f3help\fR command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the \f3help\fR command\&.
\fINote:\fR If any arguments contain spaces, you must surround them with single or double quotation marks (\f3\&'\fR or \f3"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\f3\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&.
.SH OPTIONS
.RS 4
The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the
\fBhelp\fR
command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the
\fBhelp\fR
command\&.
.sp
\fBNote:\fR
If any arguments contain spaces, you must surround them with single or double quotation marks (\fB\*(Aq\fR
or
\fB"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\fB\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&.
.RE
.SH "OPTIONS"
.PP
Options are mutually exclusive\&.
.TP
-f \fIfilename\fR
.br
Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&.
.TP
-h, -help
.PP
\-f \fIfilename\fR
.RS 4
Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the
\fBstop\fR
keyword is read\&.
.RE
.PP
\-h
.br
\-help
.RS 4
Prints a help message\&.
.TP
-l
.br
Prints the list of running Java processes identifiers with the main class and command-line arguments\&.
.SH SEE\ ALSO
.TP 0.2i
\(bu
.RE
.PP
\-l
.RS 4
Prints the list of running Java processes identifiers with the main class and command\-line arguments\&.
One or more options of the \f3jjs\fR command, separated by spaces\&. For more information, see Options\&.
.TP
\fIscript-files\fR
.RS 4
One or more options of the
\fBjjs\fR
command, separated by spaces\&. For more information, see Options\&.
.RE
.PP
\fIscript\-files\fR
.RS 4
One or more script files which you want to interpret using Nashorn, separated by spaces\&. If no files are specified, an interactive shell is started\&.
.TP
.RE
.PP
\fIarguments\fR
All values after the double hyphen marker (\f3--\fR) are passed through to the script or the interactive shell as arguments\&. These values can be accessed by using the \f3arguments\fR property (see )\&.
.SH DESCRIPTION
The \f3jjs\fR command-line tool is used to invoke the Nashorn engine\&. You can use it to interpret one or several script files, or to run an interactive shell\&.
.SH OPTIONS
The options of the \f3jjs\fR command control the conditions under which scripts are interpreted by Nashorn\&.
.TP
-ccs=\fIsize\fR , --class-cache-size=\fIsize\fR
.br
Sets the class cache size (in bytes)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes (KB), \f3m\fR or \f3M\fR to indicate megabytes (MB), \f3g\fR or \f3G\fR to indicate gigabytes (GB)\&. By default, the class cache size is set to 50 bytes\&. The following example shows how to set it to 1024 bytes (1 KB):
.sp
.nf
\f3\-css=100\fP
.fi
.nf
\f3\-css=1k\fP
.fi
.nf
\f3\fP
.fi
.sp
.TP
-co, --compile-only
.br
Compiles the script without running it\&.
.TP
-cp \fIpath\fR , -classpath \fIpath\fR
.br
.RS 4
All values after the double hyphen marker (\fB\-\-\fR) are passed through to the script or the interactive shell as arguments\&. These values can be accessed by using the
\fBarguments\fR
property (see Example 3)\&.
.RE
.SH "DESCRIPTION"
.PP
The
\fBjjs\fR
command\-line tool is used to invoke the Nashorn engine\&. You can use it to interpret one or several script files, or to run an interactive shell\&.
.SH "OPTIONS"
.PP
The options of the
\fBjjs\fR
command control the conditions under which scripts are interpreted by Nashorn\&.
.PP
\-cp \fIpath\fR
.br
\-classpath \fIpath\fR
.RS 4
Specifies the path to the supporting class files To set multiple paths, the option can be repeated, or you can separate each path with a colon (:)\&.
.TP
-D\fIname\fR=\fIvalue\fR
.br
Sets a system property to be passed to the script by assigning a value to a property name\&. The following example shows how to invoke Nashorn in interactive mode and assign \f3myValue\fR to the property named \f3myKey\fR:
Sets a system property to be passed to the script by assigning a value to a property name\&. The following example shows how to invoke Nashorn in interactive mode and assign
This option can be repeated to set multiple properties\&.
.TP
-d=\fIpath\fR , --dump-debug-dir=\fIpath\fR
.br
Specifies the path to the directory where class files are dumped\&.
.TP
--debug-lines
.br
Generates a line number table in the class file\&. By default, this option is enabled\&. To disable it, specify \f3--debug-lines=false\fR\&.
.TP
--debug-locals
.br
Generates a local variable table in the class file\&.
.TP
-doe, --dump-on-error
.RE
.PP
\-doe
.br
\-\-dump\-on\-error
.RS 4
Provides a full stack trace when an error occurs\&. By default, only a brief error message is printed\&.
.TP
--early-lvalue-error
.br
Reports invalid lvalue expressions as early errors (that is, when the code is parsed)\&. By default, this option is enabled\&. To disable it, specify \f3--early-lvalue-error=false\fR\&. When disabled, invalid lvalue expressions will not be reported until the code is executed\&.
.TP
--empty-statements
.br
Preserves empty statements in the Java abstract syntax tree\&.
.TP
-fv, --fullversion
.RE
.PP
\-fv
.br
\-\-fullversion
.RS 4
Prints the full Nashorn version string\&.
.TP
--function-statement-error
.br
Prints an error message when a function declaration is used as a statement\&.
.TP
--function-statement-warning
.br
Prints a warning message when a function declaration is used as a statement\&.
.TP
-fx
.br
.RE
.PP
\-fx
.RS 4
Launches the script as a JavaFX application\&.
.TP
-h, -help
.RE
.PP
\-h
.br
\-help
.RS 4
Prints the list of options and their descriptions\&.
.TP
-J\fIoption\fR
.br
Passes the specified \f3java\fR launcher option to the JVM\&. The following example shows how to invoke Nashorn in interactive mode and set the maximum memory used by the JVM to 4 GB:
This option can be repeated to pass multiple \f3java\fR command options\&.
.TP
--language=[es5]
.br
.RE
.PP
\-\-language=[es5]
.RS 4
Specifies the ECMAScript language version\&. The default version is ES5\&.
.TP
--lazy-compilation
.br
Enables lazy code generation strategies (that is, the entire script is not compiled at once)\&. This option is experimental\&.
.TP
--loader-per-compile
.br
Creates a new class loader per compile\&. By default, this option is enabled\&. To disable it, specify \f3--loader-per-compile=false\fR\&.
.TP
--log=\fIsubsystem\fR:\fIlevel\fR
.br
Performs logging at a given level for the specified subsystems\&. You can specify logging levels for multiple subsystems separating them with commas\&. For example:
.sp
.nf
\f3\-\-log=fields:finest,codegen:info\fP
.fi
.sp
.TP
--optimistic-types=[true|false]
.RE
.PP
\-ot
.br
\-\-optimistic\-types=[true|false]
.RS 4
Enables or disables optimistic type assumptions with deoptimizing recompilation\&. Running with optimistic types will yield higher final speed, but may increase warmup time\&.
.TP
--package=\fIname\fR
.br
Specifies the package to which generated class files are added\&.
.TP
--parse-only
.br
Parses the code without compiling\&.
.TP
--print-ast
.br
Prints the abstract syntax tree\&.
.TP
--print-code
.br
Prints bytecode\&.
.TP
--print-lower-ast
.br
Prints the lowered abstract syntax tree\&.
.TP
--print-lower-parse
.br
Prints the lowered parse tree\&.
.TP
--print-no-newline
.br
Forces other \f3--print*\fR options to print the output on one line\&.
.TP
--print-parse
.br
Prints the parse tree\&.
.TP
--print-symbols
.br
Prints the symbol table\&.
.TP
-pcs, --profile-callsites
.br
Dumps callsite profile data\&.
.TP
-scripting
.br
.RE
.PP
\-scripting
.RS 4
Enables shell scripting features\&.
.TP
--stderr=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard error stream to the specified file, stream (for example, to \f3stdout\fR), or text terminal\&.
.TP
--stdout=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard output stream to the specified file, stream (for example, to \f3stderr\fR), or text terminal\&.
.TP
-strict
.br
.RE
.PP
\-strict
.RS 4
Enables strict mode, which enforces stronger adherence to the standard (ECMAScript Edition 5\&.1), making it easier to detect common coding errors\&.
.TP
-t=\fIzone\fR , -timezone=\fIzone\fR
.br
Sets the specified time zone for script execution\&. It overrides the time zone set in the OS and used by the \f3Date\fR object\&.
utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&.
.if n \{\
.sp
.SH DESCRIPTION
The \f3jcmd\fR utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&.
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.TS
allbox tab(:);
l.
T{
.PP
To invoke diagnostic commands from a remote machine or with different identifiers, you can use the
interface, see the API documentation at http://docs\&.oracle\&.com/javase/8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html
T}
.TE
.sp 1
.sp .5v
.RE
.PP
\fINote:\fR To invoke diagnostic commands from a remote machine or with different identiers, you can use the \f3com\&.sun\&.management\&.DiagnosticCommandMBean\fR interface\&. For more information about the \f3DiagnosticCommandMBean\fR interface, see the API documentation at http://download\&.java\&.net/jdk8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html
If you run
\fBjcmd\fR
without arguments or with the
\fB\-l\fR
option, it prints the list of running Java process identifiers with the main class and command\-line arguments that were used to launch the process\&. Running
\fBjcmd\fR
with the
\fB\-h\fR
or
\fB\-help\fR
option prints the tool\(cqs help message\&.
.PP
If you run \f3jcmd\fR without arguments or with the \f3-l\fR option, it prints the list of running Java process identifiers with the main class and command-line arguments that were used to launch the process\&. Running \f3jcmd\fR with the \f3-h\fR or \f3-help\fR option prints the tool\(cqs help message\&.
If you specify the processes identifier (\fIpid\fR) or the main class (\fImain\-class\fR) as the first argument,
\fBjcmd\fR
sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying
\fB0\fR
as the process identifier\&. Use one of the following as the diagnostic command request:
.PP
If you specify the processes identifier (\fIpid\fR) or the main class (\fImain-class\fR) as the first argument, \f3jcmd\fR sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying \f30\fR as the process identifier\&. Use one of the following as the diagnostic command request:
.TP
Perfcounter\&.print
.RS 4
Prints the performance counters available for the specified Java process\&. The list of performance counters might vary with the Java process\&.
.TP
-f \fIfilename\fR
.br
The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the \f3-f\fR option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&.
.TP
.RE
.PP
\-f \fIfilename\fR
.RS 4
The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the
\fB\-f\fR
option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the
\fBstop\fR
keyword is read\&.
.RE
.PP
\fIcommand\fR [\fIarguments\fR]
The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the \f3help\fR command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the \f3help\fR command\&.
\fINote:\fR If any arguments contain spaces, you must surround them with single or double quotation marks (\f3\&'\fR or \f3"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\f3\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&.
.SH OPTIONS
.RS 4
The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the
\fBhelp\fR
command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the
\fBhelp\fR
command\&.
.sp
\fBNote:\fR
If any arguments contain spaces, you must surround them with single or double quotation marks (\fB\*(Aq\fR
or
\fB"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\fB\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&.
.RE
.SH "OPTIONS"
.PP
Options are mutually exclusive\&.
.TP
-f \fIfilename\fR
.br
Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&.
.TP
-h, -help
.PP
\-f \fIfilename\fR
.RS 4
Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\fB#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the
\fBstop\fR
keyword is read\&.
.RE
.PP
\-h
.br
\-help
.RS 4
Prints a help message\&.
.TP
-l
.br
Prints the list of running Java processes identifiers with the main class and command-line arguments\&.
.SH SEE\ ALSO
.TP 0.2i
\(bu
.RE
.PP
\-l
.RS 4
Prints the list of running Java processes identifiers with the main class and command\-line arguments\&.
One or more options of the \f3jjs\fR command, separated by spaces\&. For more information, see Options\&.
.TP
\fIscript-files\fR
.RS 4
One or more options of the
\fBjjs\fR
command, separated by spaces\&. For more information, see Options\&.
.RE
.PP
\fIscript\-files\fR
.RS 4
One or more script files which you want to interpret using Nashorn, separated by spaces\&. If no files are specified, an interactive shell is started\&.
.TP
.RE
.PP
\fIarguments\fR
All values after the double hyphen marker (\f3--\fR) are passed through to the script or the interactive shell as arguments\&. These values can be accessed by using the \f3arguments\fR property (see )\&.
.SH DESCRIPTION
The \f3jjs\fR command-line tool is used to invoke the Nashorn engine\&. You can use it to interpret one or several script files, or to run an interactive shell\&.
.SH OPTIONS
The options of the \f3jjs\fR command control the conditions under which scripts are interpreted by Nashorn\&.
.TP
-ccs=\fIsize\fR , --class-cache-size=\fIsize\fR
.br
Sets the class cache size (in bytes)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes (KB), \f3m\fR or \f3M\fR to indicate megabytes (MB), \f3g\fR or \f3G\fR to indicate gigabytes (GB)\&. By default, the class cache size is set to 50 bytes\&. The following example shows how to set it to 1024 bytes (1 KB):
.sp
.nf
\f3\-css=100\fP
.fi
.nf
\f3\-css=1k\fP
.fi
.nf
\f3\fP
.fi
.sp
.TP
-co, --compile-only
.br
Compiles the script without running it\&.
.TP
-cp \fIpath\fR , -classpath \fIpath\fR
.br
.RS 4
All values after the double hyphen marker (\fB\-\-\fR) are passed through to the script or the interactive shell as arguments\&. These values can be accessed by using the
\fBarguments\fR
property (see Example 3)\&.
.RE
.SH "DESCRIPTION"
.PP
The
\fBjjs\fR
command\-line tool is used to invoke the Nashorn engine\&. You can use it to interpret one or several script files, or to run an interactive shell\&.
.SH "OPTIONS"
.PP
The options of the
\fBjjs\fR
command control the conditions under which scripts are interpreted by Nashorn\&.
.PP
\-cp \fIpath\fR
.br
\-classpath \fIpath\fR
.RS 4
Specifies the path to the supporting class files To set multiple paths, the option can be repeated, or you can separate each path with a colon (:)\&.
.TP
-D\fIname\fR=\fIvalue\fR
.br
Sets a system property to be passed to the script by assigning a value to a property name\&. The following example shows how to invoke Nashorn in interactive mode and assign \f3myValue\fR to the property named \f3myKey\fR:
Sets a system property to be passed to the script by assigning a value to a property name\&. The following example shows how to invoke Nashorn in interactive mode and assign
This option can be repeated to set multiple properties\&.
.TP
-d=\fIpath\fR , --dump-debug-dir=\fIpath\fR
.br
Specifies the path to the directory where class files are dumped\&.
.TP
--debug-lines
.br
Generates a line number table in the class file\&. By default, this option is enabled\&. To disable it, specify \f3--debug-lines=false\fR\&.
.TP
--debug-locals
.br
Generates a local variable table in the class file\&.
.TP
-doe, --dump-on-error
.RE
.PP
\-doe
.br
\-\-dump\-on\-error
.RS 4
Provides a full stack trace when an error occurs\&. By default, only a brief error message is printed\&.
.TP
--early-lvalue-error
.br
Reports invalid lvalue expressions as early errors (that is, when the code is parsed)\&. By default, this option is enabled\&. To disable it, specify \f3--early-lvalue-error=false\fR\&. When disabled, invalid lvalue expressions will not be reported until the code is executed\&.
.TP
--empty-statements
.br
Preserves empty statements in the Java abstract syntax tree\&.
.TP
-fv, --fullversion
.RE
.PP
\-fv
.br
\-\-fullversion
.RS 4
Prints the full Nashorn version string\&.
.TP
--function-statement-error
.br
Prints an error message when a function declaration is used as a statement\&.
.TP
--function-statement-warning
.br
Prints a warning message when a function declaration is used as a statement\&.
.TP
-fx
.br
.RE
.PP
\-fx
.RS 4
Launches the script as a JavaFX application\&.
.TP
-h, -help
.RE
.PP
\-h
.br
\-help
.RS 4
Prints the list of options and their descriptions\&.
.TP
-J\fIoption\fR
.br
Passes the specified \f3java\fR launcher option to the JVM\&. The following example shows how to invoke Nashorn in interactive mode and set the maximum memory used by the JVM to 4 GB:
This option can be repeated to pass multiple \f3java\fR command options\&.
.TP
--language=[es5]
.br
.RE
.PP
\-\-language=[es5]
.RS 4
Specifies the ECMAScript language version\&. The default version is ES5\&.
.TP
--lazy-compilation
.br
Enables lazy code generation strategies (that is, the entire script is not compiled at once)\&. This option is experimental\&.
.TP
--loader-per-compile
.br
Creates a new class loader per compile\&. By default, this option is enabled\&. To disable it, specify \f3--loader-per-compile=false\fR\&.
.TP
--log=\fIsubsystem\fR:\fIlevel\fR
.br
Performs logging at a given level for the specified subsystems\&. You can specify logging levels for multiple subsystems separating them with commas\&. For example:
.sp
.nf
\f3\-\-log=fields:finest,codegen:info\fP
.fi
.sp
.TP
--optimistic-types=[true|false]
.RE
.PP
\-ot
.br
\-\-optimistic\-types=[true|false]
.RS 4
Enables or disables optimistic type assumptions with deoptimizing recompilation\&. Running with optimistic types will yield higher final speed, but may increase warmup time\&.
.TP
--package=\fIname\fR
.br
Specifies the package to which generated class files are added\&.
.TP
--parse-only
.br
Parses the code without compiling\&.
.TP
--print-ast
.br
Prints the abstract syntax tree\&.
.TP
--print-code
.br
Prints bytecode\&.
.TP
--print-lower-ast
.br
Prints the lowered abstract syntax tree\&.
.TP
--print-lower-parse
.br
Prints the lowered parse tree\&.
.TP
--print-no-newline
.br
Forces other \f3--print*\fR options to print the output on one line\&.
.TP
--print-parse
.br
Prints the parse tree\&.
.TP
--print-symbols
.br
Prints the symbol table\&.
.TP
-pcs, --profile-callsites
.br
Dumps callsite profile data\&.
.TP
-scripting
.br
.RE
.PP
\-scripting
.RS 4
Enables shell scripting features\&.
.TP
--stderr=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard error stream to the specified file, stream (for example, to \f3stdout\fR), or text terminal\&.
.TP
--stdout=\fIfilename\fR|\fIstream\fR|\fItty\fR
.br
Redirects the standard output stream to the specified file, stream (for example, to \f3stderr\fR), or text terminal\&.
.TP
-strict
.br
.RE
.PP
\-strict
.RS 4
Enables strict mode, which enforces stronger adherence to the standard (ECMAScript Edition 5\&.1), making it easier to detect common coding errors\&.
.TP
-t=\fIzone\fR , -timezone=\fIzone\fR
.br
Sets the specified time zone for script execution\&. It overrides the time zone set in the OS and used by the \f3Date\fR object\&.
