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24 .\" Arch: generic
25 .\" Software: JDK 8
26 .\" Date: 03 March 2015
27 .\" SectDesc: Basic Tools
28 .\" Title: jjs.1
29 .\"
30 .if n .pl 99999
31 .TH jjs 1 "03 March 2015" "JDK 8" "Basic Tools"
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47 .ad l
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49 .\" * MAIN CONTENT STARTS HERE *
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51
52 .SH NAME
53 jjs \- Invokes the Nashorn engine\&.
54 .SH SYNOPSIS
55 .sp
56 .nf
57 \f3\fBjjs\fR [\fIoptions\fR] [\fIscript\-files\fR] [\-\- \fIarguments\fR]\fP
58 .fi
59 .sp
60 .TP
61 \fIoptions\fR
62 One or more options of the \f3jjs\fR command, separated by spaces\&. For more information, see Options\&.
63 .TP
64 \fIscript-files\fR
65 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\&.
66 .TP
67 \fIarguments\fR
68 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 )\&.
69 .SH DESCRIPTION
70 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\&.
71 .SH OPTIONS
72 The options of the \f3jjs\fR command control the conditions under which scripts are interpreted by Nashorn\&.
73 .TP
74 -ccs=\fIsize\fR , --class-cache-size=\fIsize\fR
75 .br
76 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):
77 .sp
78 .nf
79 \f3\-css=100\fP
80 .fi
81 .nf
82 \f3\-css=1k\fP
83 .fi
84 .nf
85 \f3\fP
86 .fi
87 .sp
88
89 .TP
90 -co, --compile-only
91 .br
92 Compiles the script without running it\&.
93 .TP
94 -cp \fIpath\fR , -classpath \fIpath\fR
95 .br
96 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 (:)\&.
97 .TP
98 -D\fIname\fR=\fIvalue\fR
99 .br
100 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:
101 .sp
102 .nf
103 \f3>> \fIjjs \-DmyKey=myValue\fR\fP
104 .fi
105 .nf
106 \f3jjs> \fIjava\&.lang\&.System\&.getProperty("myKey")\fR\fP
107 .fi
108 .nf
109 \f3myValue\fP
110 .fi
111 .nf
112 \f3jjs>\fP
113 .fi
114 .nf
115 \f3\fP
116 .fi
117 .sp
118
119
120 This option can be repeated to set multiple properties\&.
121 .TP
122 -d=\fIpath\fR , --dump-debug-dir=\fIpath\fR
123 .br
124 Specifies the path to the directory where class files are dumped\&.
125 .TP
126 --debug-lines
127 .br
128 Generates a line number table in the class file\&. By default, this option is enabled\&. To disable it, specify \f3--debug-lines=false\fR\&.
129 .TP
130 --debug-locals
131 .br
132 Generates a local variable table in the class file\&.
133 .TP
134 -doe, --dump-on-error
135 .br
136 Provides a full stack trace when an error occurs\&. By default, only a brief error message is printed\&.
137 .TP
138 --early-lvalue-error
139 .br
140 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\&.
141 .TP
142 --empty-statements
143 .br
144 Preserves empty statements in the Java abstract syntax tree\&.
145 .TP
146 -fv, --fullversion
147 .br
148 Prints the full Nashorn version string\&.
149 .TP
150 --function-statement-error
151 .br
152 Prints an error message when a function declaration is used as a statement\&.
153 .TP
154 --function-statement-warning
155 .br
156 Prints a warning message when a function declaration is used as a statement\&.
157 .TP
158 -fx
159 .br
160 Launches the script as a JavaFX application\&.
161 .TP
162 -h, -help
163 .br
164 Prints the list of options and their descriptions\&.
165 .TP
166 -J\fIoption\fR
167 .br
168 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:
169 .sp
170 .nf
171 \f3>> \fIjjs \-J\-Xmx4g\fR\fP
172 .fi
173 .nf
174 \f3jjs> \fIjava\&.lang\&.Runtime\&.getRuntime()\&.maxMemory()\fR\fP
175 .fi
176 .nf
177 \f33817799680\fP
178 .fi
179 .nf
180 \f3jjs>\fP
181 .fi
182 .nf
183 \f3\fP
184 .fi
185 .sp
186
187
188 This option can be repeated to pass multiple \f3java\fR command options\&.
189 .TP
190 --language=[es5]
191 .br
192 Specifies the ECMAScript language version\&. The default version is ES5\&.
193 .TP
194 --lazy-compilation
195 .br
196 Enables lazy code generation strategies (that is, the entire script is not compiled at once)\&. This option is experimental\&.
197 .TP
198 --loader-per-compile
199 .br
200 Creates a new class loader per compile\&. By default, this option is enabled\&. To disable it, specify \f3--loader-per-compile=false\fR\&.
201 .TP
202 --log=\fIsubsystem\fR:\fIlevel\fR
203 .br
204 Performs logging at a given level for the specified subsystems\&. You can specify logging levels for multiple subsystems separating them with commas\&. For example:
205 .sp
206 .nf
207 \f3\-\-log=fields:finest,codegen:info\fP
208 .fi
209 .sp
210
211 .TP
212 --optimistic-types=[true|false]
213 .br
214 Enables or disables optimistic type assumptions with deoptimizing recompilation\&. Running with optimistic types will yield higher final speed, but may increase warmup time\&.
215 .TP
216 --package=\fIname\fR
217 .br
218 Specifies the package to which generated class files are added\&.
219 .TP
220 --parse-only
221 .br
222 Parses the code without compiling\&.
223 .TP
224 --print-ast
225 .br
226 Prints the abstract syntax tree\&.
227 .TP
228 --print-code
229 .br
230 Prints bytecode\&.
231 .TP
232 --print-lower-ast
233 .br
234 Prints the lowered abstract syntax tree\&.
235 .TP
236 --print-lower-parse
237 .br
238 Prints the lowered parse tree\&.
239 .TP
240 --print-no-newline
241 .br
242 Forces other \f3--print*\fR options to print the output on one line\&.
243 .TP
244 --print-parse
245 .br
246 Prints the parse tree\&.
247 .TP
248 --print-symbols
249 .br
250 Prints the symbol table\&.
251 .TP
252 -pcs, --profile-callsites
253 .br
254 Dumps callsite profile data\&.
255 .TP
256 -scripting
257 .br
258 Enables shell scripting features\&.
259 .TP
260 --stderr=\fIfilename\fR|\fIstream\fR|\fItty\fR
261 .br
262 Redirects the standard error stream to the specified file, stream (for example, to \f3stdout\fR), or text terminal\&.
263 .TP
264 --stdout=\fIfilename\fR|\fIstream\fR|\fItty\fR
265 .br
266 Redirects the standard output stream to the specified file, stream (for example, to \f3stderr\fR), or text terminal\&.
267 .TP
268 -strict
269 .br
270 Enables strict mode, which enforces stronger adherence to the standard (ECMAScript Edition 5\&.1), making it easier to detect common coding errors\&.
271 .TP
272 -t=\fIzone\fR , -timezone=\fIzone\fR
273 .br
274 Sets the specified time zone for script execution\&. It overrides the time zone set in the OS and used by the \f3Date\fR object\&.
275 .TP
276 -tcs=\fIparameter\fR , --trace-callsites=\fIparameter\fR
277 .br
278 Enables callsite trace mode\&. Possible parameters are the following:
279 .RS
280 .TP
281 miss
282 Trace callsite misses\&.
283 .TP
284 enterexit
285 Trace callsite enter/exit\&.
286 .TP
287 objects
288 Print object properties\&.
289 .RE
290
291 .TP
292 --verify-code
293 .br
294 Verifies bytecode before running\&.
295 .TP
296 -v, -version
297 .br
298 Prints the Nashorn version string\&.
299 .TP
300 -xhelp
301 .br
302 Prints extended help for command-line options\&.
303 .SH EXAMPLES
304 \f3Example 1 Running a Script with Nashorn\fR
305 .sp
306 .nf
307 \f3jjs script\&.js\fP
308 .fi
309 .nf
310 \f3\fP
311 .fi
312 .sp
313 \f3Example 2 Running Nashorn in Interactive Mode\fR
314 .sp
315 .nf
316 \f3>> \fIjjs\fR\fP
317 .fi
318 .nf
319 \f3jjs> \fIprintln("Hello, World!")\fR\fP
320 .fi
321 .nf
322 \f3Hello, World!\fP
323 .fi
324 .nf
325 \f3jjs> \fIquit()\fR\fP
326 .fi
327 .nf
328 \f3>>\fP
329 .fi
330 .nf
331 \f3\fP
332 .fi
333 .sp
334 \f3Example 3 Passing Arguments to Nashorn\fR
335 .sp
336 .nf
337 \f3>> \fIjjs \-\- a b c\fR\fP
338 .fi
339 .nf
340 \f3jjs> \fIarguments\&.join(", ")\fR\fP
341 .fi
342 .nf
343 \f3a, b, c\fP
344 .fi
345 .nf
346 \f3jjs>\fP
347 .fi
348 .nf
349 \f3\fP
350 .fi
351 .sp
352 .SH SEE\ ALSO
353 \f3jrunscript\fR
354 .RE
355 .br
356 'pl 8.5i
357 'bp