[SOLVED] java.lang.IllegalAccessError JME 3.4.0alpha6 + Lemur


After switching to JME v3.4.0-alpha6 I am getting this error when using Lemur

java.lang.IllegalAccessError: class com.simsilica.lemur.event.KeyAction tried to access private method 'void com.jme3.input.KeyNames.<init>()' (com.simsilica.lemur.event.KeyAction and com.jme3.input.KeyNames are in unnamed module of loader 'app')
	at com.simsilica.lemur.event.KeyAction.<clinit>(KeyAction.java:52) ~[lemur-1.15.0-SNAPSHOT.jar:?]
	at com.simsilica.lemur.component.TextEntryComponent.<clinit>(TextEntryComponent.java:106) ~[lemur-1.15.0-SNAPSHOT.jar:?]
	at com.simsilica.lemur.TextField.createTextEntryComponent(TextField.java:130) ~[lemur-1.15.0-SNAPSHOT.jar:?]
	at com.simsilica.lemur.TextField.setDocumentModel(TextField.java:123) ~[lemur-1.15.0-SNAPSHOT.jar:?]
	at com.simsilica.lemur.TextField.<init>(TextField.java:109) ~[lemur-1.15.0-SNAPSHOT.jar:?]
	at com.simsilica.lemur.TextField.<init>(TextField.java:73) ~[lemur-1.15.0-SNAPSHOT.jar:?]
	at game.LoginState.initialize(LoginState.java:167) ~[main/:?]
	at com.jme3.app.state.BaseAppState.initialize(BaseAppState.java:132) ~[jme3-core-3.4.0-alpha6.jar:3.4.0-alpha6]
	at com.jme3.app.state.AppStateManager.initializePending(AppStateManager.java:316) ~[jme3-core-3.4.0-alpha6.jar:3.4.0-alpha6]
	at com.jme3.app.state.AppStateManager.update(AppStateManager.java:346) ~[jme3-core-3.4.0-alpha6.jar:3.4.0-alpha6]
	at com.jme3.app.SimpleApplication.update(SimpleApplication.java:254) ~[jme3-core-3.4.0-alpha6.jar:3.4.0-alpha6]
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:160) ~[jme3-lwjgl-3.4.0-alpha6.jar:3.4.0-alpha6]
	at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:196) ~[jme3-lwjgl-3.4.0-alpha6.jar:3.4.0-alpha6]
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:242) ~[jme3-lwjgl-3.4.0-alpha6.jar:3.4.0-alpha6]
	at java.base/java.lang.Thread.run(Thread.java:832) [?:?]

I noticed KeyNames.java class recently modified (a private no-arg constructor added)

in this commit

Seems KeyAction class is instantiating it (for some reason?) here

and then using it here

which could/can be replaced by a static method call

1 Like

Used to be that there was no static getName() method and so the only way to get them was to instantiate a KeyNames.

It’s unfortunate that this breaking change means that Lemur will not support JME 3.4 for the near to mid future since I’m unable to release new Lemur versions until I take the hours/days that it takes to move to maven central.

I hope perhaps that this can be put back and deprecated instead.

Edit: the commit doesn’t mention an issue number so I’m not sure where to add a comment about putting the constructor back but deprecating it.


By the way, if you wanted to submit a PR for Lemur with the change, I will review+apply it as soon as I’m able.

I’ve made a comment on the KeyNames commit hoping we can put the constructor back as deprecated for 3.4… but in the mean time we can fix Lemur for folks who build from source.


I am submitting one right now :slightly_smiling_face:


@Ali_RS thanks for reporting the issue.

I assumed KeyNames had always been a utility class. I’ll remove the constructor for KeyNames to avoid breaking Lemur.


Submitted a fix for Lemur

1 Like

It should have been… I suspect the original issue was a typo or close to it. I don’t want to speculate about vague memories I have about conversations from that time period so we’ll leave it at that.

A public constructor marked deprecated would at least kick out warnings.

Edit: and note, the non-static getName() goes all the way back to 3.0 or something… 3.1 it was made static, I guess.

1 Like

Thank you @sgold

1 Like

And thanks again to @Ali_RS for testing alpha6 and reporting the issue!

So much easier to deal with it now than during beta…


Please re-test with JME v3.4.0-alpha7.


Just tested it, works fine. Thanks