[Resolved]NullPointerException when I remove nifty processor of the guiViewPort


I have an appState which display the menu, but when I disable it I have a NullPointerException :

on my init method I have that :

[java]niftyDisplay = new NiftyJmeDisplay(assetManager, inputManager, this.app.getAudioRenderer(), this.app.getGuiViewPort());

/** Create a new NiftyGUI object /

Nifty nifty = niftyDisplay.getNifty();

* Read your XML and initialize your custom ScreenController */

nifty.fromXml("Interface/MenuGUI.xml", "MainMenu");

// attach the Nifty display to the gui view port as a processor


on my enable method (when it called I have a null pointer exception) :

[java]public void setEnabled(boolean enabled)






else if(!enabled)





The exception which I have :


at org.LRTeam.Core.MenuState.setEnabled(MenuState.java:100)

at org.LRTeam.Core.Main.switchAppState(Main.java:259)

at org.LRTeam.Core.Main.access$100(Main.java:25)

at org.LRTeam.Core.Main$1.onAnalog(Main.java:200)

at com.jme3.input.InputManager.invokeAnalogs(InputManager.java:244)

at com.jme3.input.InputManager.invokeUpdateActions(InputManager.java:214)

at com.jme3.input.InputManager.update(InputManager.java:852)

at com.jme3.app.Application.update(Application.java:598)

at com.jme3.app.SimpleApplication.update(SimpleApplication.java:233)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:149)

at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:182)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:223)

at java.lang.Thread.run(Thread.java:722)[/java]

tank in avance

where is the NullPointer? in your code or in JME?

Post the stackTrace please

1 Like

oh yes sorry, I am so stupid ><

I edit my post

stick a breakpoint down on the line it says where the NullPointerException is, im guessing its:


Perhaps setEnabled it called before the top code has executed idk, i cant check this as i’m at work atm.

From the variables window you will be able to see if either:

app is null

niftyDisplay is null

if they both have values then by elimination

getGuiVewPort() returns a null value

1 Like

Thank you a lot

In fact that niftyDisplay wich is null, but I don’t undestand for what

else, I am stupid this is not the good category, if an moderator can move this topic on GUI troubleshooting I am gratefull to him

sorry but I up this topic, because I have again the bug :frowning:

I don’t understand for what, when I tryc to debug, I see that is the niftyDisplay which is null, I don’t understand for what

well the idea in debugging is to step through the code, to see where/if niftyDisplay is initialized, or if something is setting it to null

just try this:


if (niftyDisplay != NULL) {




1 Like

ok I try that thank ^^

I am sorry I do not know for what but it seem I have not the bug

In fact I know where is the problem,

I used the RC1 release so that is a bug of the RC1 release,

now I have download the stable release and no problem,

I think this is a bug to report

thank a lot to you two