Apple AWT Issue

[jbilcke]

Hi,

I have some issues when running a library (Sikuli) on Mac:

2012-10-13 22:17:40.469 node[34314:707] Apple AWT Java VM was loaded on first thread -- can't start AWT.

node_modules/java/lib/nodeJavaBridge.js:16
  var clazz = java.findClassSync(name); // TODO: change to Class.forName when 
                   ^
Error: Could not create class org.sikuli.script.Screen
java.lang.InternalError: Can't start the AWT because Java was started on the first thread.  Make sure StartOnFirstThread is not specified in your application's Info.plist or on the command line
    at java.lang.ClassLoader$NativeLibrary.load(Native Method)
    at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1827)
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1724)
    at java.lang.Runtime.loadLibrary0(Runtime.java:823)
    at java.lang.System.loadLibrary(System.java:1045)
    at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)
    at java.security.AccessController.doPrivileged(Native Method)
    at apple.awt.CGraphicsEnvironment.<clinit>(CGraphicsEnvironment.java:23)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
    at org.sikuli.script.Screen.<clinit>(Screen.java:25)

    at Java.java.import (node_modules/java/lib/nodeJavaBridge.js:16:20)
    at Object.<anonymous> (sikuli.js:15:35)
    at Object.<anonymous> (sikuli.js:18:4)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)

I tried to do:

  var java = require("java");
  java.options.push("-XstartOnFirstThread");

but it didn't work:

Unrecognized option: -XstartOnFirstThread
Segmentation fault: 11

I also tried -Djava.awt.headless=true, without much success:

node_modules/java/lib/nodeJavaBridge.js:16
  var clazz = java.findClassSync(name); // TODO: change to Class.forName when 
                   ^
Error: Could not create class org.sikuli.script.Screen
java.lang.ExceptionInInitializerError
Caused by: java.awt.HeadlessException
    at sun.java2d.HeadlessGraphicsEnvironment.getScreenDevices(HeadlessGraphicsEnvironment.java:59)
    at org.sikuli.script.Screen.<clinit>(Screen.java:26)

    at Java.java.import (node_modules/java/lib/nodeJavaBridge.js:16:20)
    at Object.<anonymous> (sikuli.js:17:35)
    at Object.<anonymous> (sikuli.js:20:4)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)

Any ideas?

thanks!

[jbilcke]

Well actually, I think I'm dumb.. the error message clearly says I shouldn't add the startOnFirstThread :)

" Make sure StartOnFirstThread is not specified in your application's Info.plist or on the command line
at java.lang.ClassLoader$NativeLibrary.load(Native Method)"

However, I only know how to add parameters, not how to remove them, hm.. so I'm still stuck

The problem is with CGraphicsEnvironment

Running this:
java.import("sun.awt.CGraphicsEnvironment");
causes the script to hang

No idea how to further debug

[relsqui]

@mgc found a solution to this one:

process.env['JAVA_STARTED_ON_FIRST_THREAD_' + process.pid] = '1'

added before any instantiations worked like a charm for me.

[jbilcke]

I think it is time I close this 6 years old issue :)