Created attachment 150706 [details]
thread dump

What caused it (I'm sorry it is a bit ugly use case I was trying for sake of testing...)
 - clone https://github.com/tastejs/todomvc
 - in some text editor, open todomvc/samples/batman/package.json and replace it with following ( I put the \n to project name):

{
  "name": "todomv\nc-batman",
  "description": "TodoMVC todo app using batman.js",
  "version": "0.0.0",
  "dependencies": {},
  "devDependencies": {
    "coffee-script": "~1.6.2"
  },
  "scripts": {
    "compile": "coffee -c app.coffee",
    "watch": "coffee -wc app.coffee"
  },
  "private": true
}
 - start IDE
 - open this folder as project 
 - go to project properties and enable NodeJS support and check the package.json configuration checkbox
 - press OK to close project properties
=> deadlock


Thank you



Build: NetBeans IDE Dev (Build web-main-1584-on-20141125)
VM: Java HotSpot(TM) 64-Bit Server VM, 24.45-b08, Java(TM) SE Runtime Environment, 1.7.0_45-b18
OS: Linux