674243 - XPCOM: "Bad NPObject as private data!" after close first FF window

Status: RESOLVED INVALID

(Firefox :: Extension Compatibility, defect)

Description

[finderto]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.122 Safari/534.30

Steps to reproduce:

Firstly I make XPCOM (Singeltone service): 
this component use java(java logic should singelton to):
After First FF run I init Java and make JavaLoader and init my XPCOM: 
Components.classes["@xxxx.xxx/manager;1"].getService().wrappedJSObject.initJava(javaLoader);
/*
method createClass:
createClass: function(className)
    {
        return java.lang.Class.forName(className, true, this.loader).newInstance();
    },
*/


initJava: function(javaLoader)
    {
        try
        {           
            if (!this._initialized)
            {

                var factory = javaLoader.createClass("xxx.xx.CommanderFactory");         
                this.commander = factory.createCommander();
                this._initialized = true;                
            }
        }
        catch (e)
        {
            LOG(e + '::' + e.lineNumber);
            throw e;
        }
    }, 

doSomthing: function(){
       this.commander.doSome();
}


then, for example I push my button and run method "doSomthing"
and all working well.

Then I open new FF window (not new tab) and push button again/
all working well in both window



BUT! if I close First Firefox and push button in second FF I have exception: 
NPObject as private data! at this line "this.commander.doSome();"

I can open many window and close them/ Only if i close First FF will be exception/


Could do please provide workaround.

Thanks

Comment 1

[Benjamin Smedberg]

window.java is a per-window property. It initializes a Java plugin instance for that window. Once that window is closed, that plugin instance is destroyed and none of the JS objects associated with it are valid. This is by design.