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.\"     Arch: generic

.\"     Software: JDK 8

.\"     Date: 21 November 2013

.\"     SectDesc: Basic Tools

.\"     Title: jjs.1

.\"

.if n .pl 99999

.TH jjs 1 "21 November 2013" "JDK 8" "Basic Tools"

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.nh

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.\" * MAIN CONTENT STARTS HERE *

.\" -----------------------------------------------------------------

.SH NAME    

jjs \- Invokes the Nashorn engine\&.

.SH SYNOPSIS    

.sp     

.nf     

\f3\fBjjs\fR [\fIoptions\fR] [\fIscript\-files\fR] [\-\- \fIarguments\fR]\fP

.fi     

.sp     

.TP     

\fIoptions\fR

One or more options of the \f3jjs\fR command, separated by spaces\&. For more information, see Options\&.

.TP     

\fIscript-files\fR

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     

\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\fR

.fi     

.sp     

.TP

-co, --compile-only

.br

Compiles the script without running it\&.

.TP

-cp \fIpath\fR , --classpath \fIpath\fR

.br

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:

.sp     

.nf     

\f3>> \fIjjs \-DmyKey=myValue\fR\fP

.fi     

.nf     

\f3jjs> \fIjava\&.lang\&.System\&.getProperty("myKey")\fR\fP

.fi     

.nf     

\f3myValue\fP

.fi     

.nf     

\f3jjs>\fP

.fi     

.nf     

\f3\fR

.fi     

.sp     

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

.br

Provides a full stack trace when an arror 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

.br

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

Launches the script as a JavaFX application\&.

.TP

-h, -help

.br

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:

.sp     

.nf     

\f3>> \fIjjs \-J\-Xmx4g\fR\fP

.fi     

.nf     

\f3jjs> \fIjava\&.lang\&.Runtime\&.getRuntime()\&.maxMemory()\fR\fP

.fi     

.nf     

\f33817799680\fP

.fi     

.nf     

\f3jjs>\fP

.fi     

.nf     

\f3\fR

.fi     

.sp     

This option can be repeated to pass multiple \f3java\fR command options\&.

.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     

.nf     

\f3\fR

.fi     

.sp     

.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

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

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\&.

.TP

-tcs=\fIparameter\fR , --trace-callsites=\fIparameter\fR

.br

Enables callsite trace mode\&. Possible parameters are the following:

.RS     

.TP     

miss

Trace callsite misses\&.

.TP     

enterexit

Trace callsite enter/exit\&.

.TP     

objects

Print object properties\&.

.RE     

.TP

--verify-code

.br

Verifies bytecode before running\&.

.TP

-v, -version

.br

Prints the Nashorn version string\&.

.TP

-xhelp

.br

Prints extended help for command-line options\&.

.SH EXAMPLES    

\f3Example 1 Running a Script with Nashorn\fR

.sp     

.nf     

\f3jjs script\&.js\fP

.fi     

.nf     

\f3\fR

.fi     

.sp     

\f3Example 2 Running Nashorn in Interactive Mode\fR

.sp     

.nf     

\f3>> \fIjjs\fR\fP

.fi     

.nf     

\f3jjs> \fIprintln("Hello, World!")\fR\fP

.fi     

.nf     

\f3Hello, World!\fP

.fi     

.nf     

\f3jjs> \fIquit()\fR\fP

.fi     

.nf     

\f3>>\fP

.fi     

.nf     

\f3\fR

.fi     

.sp     

\f3Example 3 Passing Arguments to Nashorn\fR

.sp     

.nf     

\f3>> \fIjjs \-\- a b c\fR\fP

.fi     

.nf     

\f3jjs> \fIarguments\&.join(", ")\fR\fP

.fi     

.nf     

\f3a, b, c\fP

.fi     

.nf     

\f3jjs>\fP

.fi     

.nf     

\f3\fR

.fi     

.sp     

.SH SEE\ ALSO    

\f3jrunscript\fR

.RE

.br

'pl 8.5i

'bp