gulp-javac

Compile java source and create jars from gulp.

Notice: Source is being migrated to a new repository and is temporarily unavailable.

Install

$ npm install --save-dev gulp-javac

Usage

javac = require('gulp-javac');

gulp.task('example', function() {
  return gulp.src('./src/**/*.java')
    .pipe(javac('example.jar')
            .addLibraries('./lib/**/*.jar')
            .addLibraries('./external/**/*.jar'))
    .pipe(gulp.dest('out'));
});

API

javac.javac([options])

Returns: Duplex Stream (<java source files> ---> <class files>)

Compiles source into a set of .class files. Input files are expected to be java source files; directories are ignored. Produces a stream of generated files.

options

debuggingInformation

Type: string or string[]
Default: ['lines', 'source']

Sets the debugging information output to the class files. Valid values are 'lines', 'source', and 'vars'. Set this to 'none', null (or something false-y) to not include any debugging information. Set this to '*' to include all debugging information.

javaVersion

Type: string
Default: System default

Sets the Java language version to use. Example: '1.7'

failOnWarning

Type: boolean
Default: false

Set to true for compilation to fail on compiler warnings.

noWarnings

Type: boolean
Default: false

Set to true to not output compiler warnings.

javacToolPath

Type: string
Default: javac on $PATH

Path to the javac compiler. If javac isn't on your $PATH, set this to the path.

verbose

Type: boolean
Default: false

Set to true to include verbose javac output.

javacCompilerFlags

Type: string[]
Default: []

Flags to pass to the underlying javac runner. See the -J flag in man javac.

traceEnabled

Type: boolean
Default: undefined (Uses module settings)

Sets tracing for this particular step. This overrides the module-level setting.

addLibraries(...sources)

Returns: javac object

Adds libraries to the classpath for compilation against. This returns the javac object that it was called on so that calls can be chained.

sources

Required
Type: string or string[] or readable stream of vinyl files

Libraries to add. If this is a string or string[] it is treated as a glob spec and all files are added. Otherwise all files on the stream are added. The following are all equivalent:

javac().addLibraries('./a/**/*').addLibraries('./b/**/*');
javac().addLibraries('./a/**/*', './b/**/*');
javac().addLibraries(['./a/**/*', './b/**/*']);
javac().addLibraries(gulp.src('./a/**/*'), gulp.src('./b/**/*'));
javac().addLibraries(gulp.src(['./a/**/*', './b/**/*']));

javac.jar(jarName, [options])

Returns: Duplex Stream (<class files> ---> <jar file>)

Builds a jar file from provided sources. Expects a stream of jar contents and will use relative paths for jar contents. Produces a stream with just the resulting jar.

Note: The jar command will not repackage other jars. If other jars are included in the sources, those jars will be embedded within the created jar, which probably isn't what you want. If you want to repackage jars, you can try the following recipe:

const merge = require('merge-stream');

merge(
    gulp.src('./src/**/*.java')
      .pipe(javac.javac()
            .addLibraries('./lib/**/*.jar')),
    gulp.src('./lib/**/*.jar')
      .pipe(javac.unjar()))
  .pipe(jar('example.jar'));

This is likely to fail if there are collisions. In this case you'll probably have to use other tools, like Jar Jar Links or ProGuard.

jarName

Required Base name of the jar file to create.

options

omitManifest

Type: boolean
Default: false

Use true to direct the jar tool to not create a manifest.

entryPoint

Type: string
Default: undefined

Set this to the full class name of the class to use when running the jar from the command line.

jarToolPath

Type: string
Default: jar on $PATH

Path to the jar tool. If jar isn't on your $PATH, set this to the path.

verbose

Type: boolean
Default: false

Set to true to include verbose jar output.

traceEnabled

Type: boolean
Default: undefined (Uses module settings)

Sets tracing for this particular step. This overrides the module-level setting.

jarCompilerFlags

Type: string[]
Default: []

Flags to pass to the underlying jar runner. See the -J flag in man jar.

javac.unjar([options])

Returns: Duplex Stream (<jar files> ---> <jar contents>)

Extracts files from a jar. Expects a stream of jar files. Produces a stream of the jar contents. By default this will only include .class files, but can be expanded to all files by using the includeAllFiles option.

options

jarToolPath

Type: string Default: jar on $PATH

Path to the jar tool. If jar isn't on your $PATH, set this to the path.

includeAllFiles

Type: boolean Default: false

Set to true to include all jar contents. Otherwise only .class files will be included.

verbose

Type: boolean Default: false

Set to true to include verbose jar output.

traceEnabled

Type: boolean Default: undefined (Uses module settings)

Sets tracing for this particular step. This overrides the module-level setting.

javac(jarName, [options])

Returns: Duplex Stream (<java source files> ---> <jar file>)

Convenience function for running both javac.javac(...) and javac.jar(...). These are equivalent:

// Options.
let javacOptions = {...},
    jarOptions = {...},
    jarName = '...';

let mergedOptions = require('underscore')
  .extend({}, javacOptions, jarOptions);

// Manual method:
gulp.src(...)
  .pipe(javac.javac(mergedOptions).addLibraries(...))
  .pipe(javac.jar(jarName, mergedOptions));

// Merged method:
gulp.src(...)
  .pipe(javac(jarName, mergedOptions).addLibraries(...));

The only overlapping options are verbose and traceEnabled. jarName is passed to jar() and options is passed to both javac and jar. The addLibraries() method is passed to javac, but the return object is this stream to allow chaining.

trace

Type: boolean
Default: false

Module-level flag for tracing. Set to true to enable trace output. This is useful when trying to diagnose a problem with compilation, or when developing the library.

This can be enabled per-run by passing a --gulp-javac.trace flag to gulp.

License

The MIT License (MIT)

Copyright (c) 2016 Paul Hounshell paul.hounshell@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.