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79 lines
3.5 KiB
Markdown
79 lines
3.5 KiB
Markdown
TeaVM
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=====
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[](https://travis-ci.org/konsoletyper/teavm)
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What is TeaVM?
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--------------
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TeaVM is an ahead-of-time translator from Java bytecode to JavaScript.
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It can be compared with GWT, however TeaVM does not require source code of your application and
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all required libraries.
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You can use TeaVM for building applications for the browser, due to the following features:
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* per-method dependency analyzer, that determines a set of methods that are really needed
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to run your application, so TeaVM won't translate whole JAR files;
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* fast JavaScript; for now it is almost as fast as the JavaScript, generated by GWT;
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* Java class library emulation;
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* integration with Maven and Eclipse;
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* generation of source maps;
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* debugger;
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* interoperation with JavaScript libraries together with the set of predefined browser interfaces.
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Quick start
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-----------
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There are several options of using TeaVM. One is the Maven build.
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The easiest way to create a new TeaVM project is to type in the command line:
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mvn -DarchetypeCatalog=local \
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-DarchetypeGroupId=org.teavm \
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-DarchetypeArtifactId=teavm-maven-webapp \
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-DarchetypeVersion=0.4.3 archetype:generate
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Now you can execute `mvn clean package` and get the generated `war` file.
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Deploy this `war` in Tomcat or another container, or simply unzip it and open the `index.html` page.
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It is much easier to develop TeaVM applications using Eclipse.
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If you prefer Eclipse, please read [this tutorial](https://github.com/konsoletyper/teavm/wiki/Eclipse-tutorial).
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To learn TeaVM deeper, you take a look at the [samples](samples) module,
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containing examples of TeaVM-based projects.
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Also you can read [project's wiki](https://github.com/konsoletyper/teavm/wiki/).
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DukeScript
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----------
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[DukeScript](http://wiki.apidesign.org/wiki/DukeScript) is a set of APIs that allows Java applications
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easily talk to JavaScript environment to (usually) animate an HTML page. While DukeScript has its own
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implementation of JVM, called [Bck2Brwsr](http://wiki.apidesign.org/wiki/Bck2Brwsr), TeaVM also provides
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support for running DukeScript applications, using [teavm-html4j](teavm-html4j) plugin.
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Live examples
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-------------
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Compare the speed of JavaScript produced by TeaVM and GWT here: http://teavm.org/live-examples/jbox2d-benchmark/
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Play [Geobot](http://teavm.org/live-examples/geobot/), a little physics-based puzzle game.
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Thanks to [joan789](http://joan789.deviantart.com/) for her great artwork!
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Thanks to [Jaroslav Tulach](http://wiki.apidesign.org/wiki/User:JaroslavTulach), author of DukeScript, we have several
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DukeScript example applications. One is the minesweeper game.
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You can try its TeaVM-compiled version [here](http://xelfi.cz/minesweeper/teavm/), and then take a look at
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[source code](http://source.apidesign.org/hg/html~demo/file/4dce5ea7e13a/minesweeper/src/main/java/org/apidesign/demo/minesweeper/MinesModel.java)
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and [HTML page](http://source.apidesign.org/hg/html~demo/file/4dce5ea7e13a/minesweeper/src/main/webapp/pages/index.html).
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Another example is available [here](http://graphhopper.com/teavm/).
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It uses [GraphHopper](https://github.com/graphhopper/graphhopper/) to build route in browser.
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Unlike original GraphHopper example it works completely in browser instead of querying server.
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Thanks to [Peter Karich](https://github.com/karussell).
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Feedback
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--------
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Ask your questions by email: info@teavm.org. Also you can report issues on a project's [issue tracker](https://github.com/konsoletyper/teavm/issues).
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