Re: Having trouble with Embedding Mozilla

No if you use the JavaXPCom route it will use the same VM as embedded 
XulRunner / Gecko.

Note that you need to generate both the interface, and the typelib (the 
xpt) for an xpcom component for Javascript to be able to consume it.

J.J. Zhuang wrote:
> An update on my question.  I finally got it to work.  Now the embedded mozilla can run my simple xul app just fine and a window can pop up.
> 
> My question now becomes how I can access java classes from javascripts running in the embedded xul app?  If I use java xpcom, will the xul app try to create another VM instance using java plugin?  I certainly want the VM to be the same as the embedding VM.
> 
> Thanks for any input you have!
> 
> J.J. Zhuang
> 
> 
> ----- "J.J. Zhuang" <[email protected]> wrote:
>> I'm trying out embedding mozilla in my java program.  I followed the
>> example give at this URL:
>>
>> http://developer.mozilla.org/en/docs/JavaXPCOM:Embedding_Mozilla_in_a_Java_Application_using_JavaXPCOM
>>
>> Here's my code:
>>
>> public class SimpleLauncher {
>>
>>     public static class LocationProvider implements
>> IAppFileLocProvider {
>>
>>         File grePath;
>>
>>         public LocationProvider(File grePath) {
>>             this.grePath = grePath;
>>         }
>>
>>         public File getFile(String aProp, boolean[] aPersistent) {
>>             System.out.println(aProp);
>>             System.out.println(aPersistent);
>>
>>             File file = null;
>>             if (aProp.equals("GreD") || aProp.equals("GreComsD")) {
>>                 file = grePath;
>>                 if (aProp.equals("GreComsD")) {
>>                     file = new File(file, "components");
>>                 }
>>             } else if (aProp.equals("MozBinD") ||
>> aProp.equals("CurProcD")
>>                     || aProp.equals("ComsD") || aProp.equals("ProfD"))
>> {
>>                 file = grePath;
>>                 if (aProp.equals("ComsD")) {
>>                     file = new File(file, "components");
>>                 }
>>             }
>>             return file;
>>         }
>>
>>         public File[] getFiles(String aProp) {
>>             System.out.println(aProp);
>>
>>             File[] files = null;
>>             if (aProp.equals("APluginsDL")) {
>>                 files = new File[1];
>>                 files[0] = new File(grePath, "plugins");
>>             }
>>             return files;
>>         }
>>     }
>>
>>    public static void main(String[] args) {
>>
>>         Mozilla mozilla = Mozilla.getInstance();
>>         GREVersionRange[] range = new GREVersionRange[1];
>>         range[0] = new GREVersionRange("1.8.0", true, "1.9", false);
>>         // work with trunk nightly version 1.9a1
>>
>>         try {
>>             File grePath = Mozilla.getGREPathWithProperties(range,
>> null);
>>             System.out.println(grePath.toString());
>>
>>             mozilla.initialize(grePath);
>>             LocationProvider locProvider = new
>> LocationProvider(grePath);
>>             mozilla.initEmbedding(grePath, grePath, locProvider);
>>
>>             // Now we need to start an XUL application, so we get an
>> instance of
>>             // the
>>             // XPCOM service manager
>>             nsIServiceManager serviceManager =
>> mozilla.getServiceManager();
>>
>>             // Now we need to get the
>> @mozilla.org/toolkit/app-startup;1
>>             // service:
>>             nsIAppStartup appStartup = (nsIAppStartup) serviceManager
>>                     .getServiceByContractID(
>>                             "@mozilla.org/toolkit/app-startup;1",
>>                             nsIAppStartup.NS_IAPPSTARTUP_IID);
>>
>>             // Get the nsIWindowWatcher interface to the above
>>             nsIWindowCreator windowCreator = (nsIWindowCreator)
>> appStartup
>>                    
>> .queryInterface(nsIWindowCreator.NS_IWINDOWCREATOR_IID);
>>
>>             // Get the window watcher service
>>             nsIWindowWatcher windowWatcher = (nsIWindowWatcher)
>> serviceManager
>>                     .getServiceByContractID(
>>                             "@mozilla.org/embedcomp/window-watcher;1",
>>                             nsIWindowWatcher.NS_IWINDOWWATCHER_IID);
>>
>>             // Set the window creator (from step 6)
>>             windowWatcher.setWindowCreator(windowCreator);
>>
>>             // Create the root XUL window:
>>             nsIDOMWindow win = windowWatcher.openWindow(null,
>>                     "chrome://your-app/content/window.xul",
>> "mywindow",
>>                     "chrome,resizable,centerscreen", null);
>>
>>             // Set this as the active window
>>             windowWatcher.setActiveWindow(win);
>>
>>             // Hand over the application to xpcom/xul, this will
>> block:
>>             appStartup.run();
>>
>>         } catch (FileNotFoundException e) {
>>             // this exception is thrown if greGREPathWithProperties
>> cannot find
>>             // a GRE
>>         } catch (XPCOMException e) {
>>             // this exception is thrown if initEmbedding failed
>>         }
>>
>>     }
>> }
>>
>> I can see that the correct xulrunner is found and the
>> LocationProvider.getFile() is being called.  Obviously the url
>> "chrome://your-app/content/window.xul" should be replaced with
>> something real.  But no matter what I try nothing happens.  I don't
>> see any window popping up.  I'm on Mac OS X and have not tried this on
>> Windows.  Has anyone ever got this to work following the instructions?
>>
>> Thanks for your  help!
>>
>> J.J. Zhuang
>