problem using nw.js with node-java

[vrmerlin]

I'm attempting to put together a simple example that demonstrates NW.js working with the node-java package. Here is my package.json file:

{
  "name": "nw_java_test",
  "version": "1.0.0",
  "description": "",
  "main": "index_plain.html",
  "dependencies": {
    "bower": "^1.7.9",
    "java": "^0.7.2",
    "nw": "^0.18.2"
  }
}

I have an index_plain.html file that's fairly simple, and references a sample.js file. In that sample.js file, I have this entry:

var java = require('java');

When I run nw on the index_plain.html (node_modules/.bin/nw .), I get this error:

/u/fisher23/nwJavaTest/node_modules/nw/nwjs/nw: symbol lookup error: /u/fisher23/nwJavaTest/node_modules/java/build/Release/nodejavabridge_bindings.node: undefined symbol: _ZN2v816FunctionTemplate3NewEPNS_7IsolateEPFvRKNS_20FunctionCallbackInfoINS_5ValueEEEENS_5LocalIS4_EENSA_INS_9SignatureEEEi

If I remove the require('java') line, this error goes away (but of course I can't use Java).

Why am I getting this error?

Thanks,
John

[vrmerlin]

Any ideas out there? This is a "show stopper" for us, and NW.js looks really promising. :-(

[RohitSharma27]

Your NW and OS' version?

[vrmerlin]

The NW version is 0.18.2 and the OS version is Red Hat Enterprise Linux Workstation release 7.2 (Maipo).

[vrmerlin]

Well, I'm not quite sure what changed to make it start working, but with this package.json:

{
  "name": "nw_java_test",
  "version": "1.0.0",
  "description": "",
  "main": "index_plain.html",
  "dependencies": {
    "bower": "^1.7.9",
    "java": "^0.7.2",
    "nw": "^0.18.3"
  }
}

I'm getting this error:

module.js:642
  return process.dlopen(module, path._makeLong(filename));
                 ^

Error: The module '/u/fisher23/nwJavaTest/node_modules/java/build/Release/nodejavabridge_bindings.node'
was compiled against a different Node.js version using
NODE_MODULE_VERSION 48. This version of Node.js requires
NODE_MODULE_VERSION 51. Please try re-compiling or re-installing
the module (for instance, using `npm rebuild` or`npm install`).
    at Object.Module._extensions..node (module.js:642:18)
    at Module.load (module.js:514:32)
    at tryModuleLoad (module.js:473:12)
    at Function.Module._load (module.js:465:3)
    at Module.require (module.js:524:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/u/fisher23/nwJavaTest/node_modules/java/lib/nodeJavaBridge.js:21:16)
    at Module._compile (module.js:597:32)
    at Object.Module._extensions..js (module.js:612:10)
    at Module.load (module.js:514:32)

My impression from reading http://docs.nwjs.io/en/latest/For%20Users/Advanced/Use%20Native%20Node%20Modules/ is that I don't need to do any special rebuilds ("In 0.14.x LTS release, native modules built by node-gyp or npm in upstream can be supported.") for this to work. What might I be doing wrong?

Thanks,
John

[RohitSharma27]

Well...I am a Mac and windows guy. So, can't help you with the Linux. Although I have been doing the development on LTS version yet I remember that the V8 has got ABI changes in 0.18.x. You'll need to rebuild your module using nw-gyp. The line that you have stated above is true for LTS version. See if this helps you. :)

[RohitSharma27]

See this #5025

[ghostoy]

The V8 version used in NW.js 0.18.2 is different from official Node.js. You have to rebuild all native modules with nw-gyp. If it still won't work, please respond here.

[vrmerlin]

Ok, I was able to get it to work. For future reference, here is my package.json:

{
  "name": "nw_java_test",
  "version": "1.0.0",
  "description": "",
  "main": "index_plain.html",
  "dependencies": {
    "java": "git+https://github.com/joeferner/node-java.git",
    "nw": "^0.18.3"
  }
}

(I'm grabbing the node-java out of the master branch because of a problem described in node-java #359 ). My build script is as follows:

#!/bin/bash

npm install 

cd node_modules/java
nw-gyp rebuild --target=0.18.3 --arch=x64
npm run postinstall
cd ../..

[AnnamrajuSarvani]

Hi,
I am getting version issues I am using nw 0.22.3 and tried lower nw versions but I get above error. Node: 6.10.3, java: jdk 1.8.0 and jre 1.8.0
The module '/home/cronj-10/Sarvani/offline-sample-app-new/node_modules/java/build/Release/nodejavabridge_bindings.node'
was compiled against a different Node.js version using
NODE_MODULE_VERSION 47. This version of Node.js requires
NODE_MODULE_VERSION 51.

I re-compiled with nw-gyp build --target=nw-version(0.22.3)
My node-java version 0.8.0.
What is issue in building? How to fix this?
I am using ubuntu14.04