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AvatarJS

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[https://avatar-js.java.net/ AvatarJS] is a re-implementation of [[NodeJS]] on top of the [[JVM]]. [[JDK]]8 comes with [[Nashorn]] and that is certainly better [[JavaScript]] virtual machine than old [[Rhino]]. However [[NodeJS]] is not just [[JavaScript]], it also contains a lot of native bindings. What can be done with those?
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[https://avatar-js.java.net/ AvatarJS] was an attempt to re-implement [[NodeJS]] on top of the [[JVM]]. These days just download [[GraalVM]] and you'll get [[JavaScript]] and [[Java]] for free. Compatibility is guaranteed.
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=== Get [[AvatarJS]] ===
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Well, just download [[AvatarJS]] binaries and you are set to go. One could get the [[AvatarJS]] libraries from maven.java.net (as of Feb 17, 2014):
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* The JAR: https://maven.java.net/index.html#nexus-search;quick~avatar-js
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* The native library: https://maven.java.net/index.html#nexus-search;quick~libavatar-js
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To bind them together I renamed the libraries:
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<source lang="bash">
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avatar-js.jar
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libavatar-js-linux-x64.so
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libavatar-js.so -> libavatar-js-linux-x64.so
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# and then I could execute them as
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java -Djava.library.path=. -jar avatar-js.jar
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</source>
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=== Compatibility ===
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Compatibility was tested on http://www.manning-source.com/books/cantelon/code_Node.js.zip sources. As of Mar 18, 2014 the 2/chat/ example works.
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The 8 example is using '''const''' keyword in mongodb NodeJS modules (reported and fixed as https://bugs.openjdk.java.net/browse/JDK-8027933 on May 2nd, 2014). One can either replace the '''const''' with '''var''' or get latest [[Nashorn]] build.
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Then the application starts, but crashes. The single line fix is documented on the [https://avatar-js.java.net/ AvatarJS] main page: inserting "if (options.locals)" was enough to fix the problem. Then the application started.
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=== Tooling ===
=== Tooling ===
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The [[NetBeans]] tooling (including excellent debugging, see [[Nashorn]]) is being developed at http://hg.netbeans.org/core-main/file/32b5ebff07b4/avatar_js.project
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The [[NetBeans]] tooling (including excellent debugging, see [[Nashorn]]).
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I know that [[Tim Boudreau]] has module with good [[NodeJS]] support as well and I let him put here a link once he also supports [[AvatarJS]].
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=== Speed ===
=== Speed ===
Yeah, so far [[V8]] is faster than [[Nashorn]], but let me point you to [http://www.slideshare.net/ThomasWuerthinger/2014-0424-graal-modularity presentation about next generation Nashorn] virtual machine to see where the speed will come from...
Yeah, so far [[V8]] is faster than [[Nashorn]], but let me point you to [http://www.slideshare.net/ThomasWuerthinger/2014-0424-graal-modularity presentation about next generation Nashorn] virtual machine to see where the speed will come from...

Revision as of 14:51, 15 July 2020

AvatarJS was an attempt to re-implement NodeJS on top of the JVM. These days just download GraalVM and you'll get JavaScript and Java for free. Compatibility is guaranteed.

Tooling

The NetBeans tooling (including excellent debugging, see Nashorn).

Speed

Yeah, so far V8 is faster than Nashorn, but let me point you to presentation about next generation Nashorn virtual machine to see where the speed will come from...

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