Applet Permission

Troubleshooting General Help
1

Guys I wanna deploy my game as an applet. While running the applet on browser I got nullpointer error and nothing detailed. However I look it up with appletviewer it gives me this error:

[java]java.lang.ExceptionInInitializerError
at main.GameApplet.init(GameApplet.java:56)
at sun.applet.AppletPanel.run(AppletPanel.java:435)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.security.AccessControlException: access denied (“java.util.PropertyPermission” “user.home” “read”)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:372)
at java.security.AccessController.checkPermission(AccessController.java:559)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1302)
at java.lang.System.getProperty(System.java:707)
at chessgame.ChessGameController.<clinit>(ChessGameController.java:26)
… 3 more[/java]

Okay it looks like I have to sign my jar which keeps my game’s classes. I have done that before and also signed the dependent jars. The jars I have signed are below:
[java]game.jar(keeps my classes I have written)
jinput.jar
jME3-core.jar
jME3-desktop.jar
jME3-lwjgl.jar
jME3-lwjgl-natives.jar
lwjgl.jar[/java]

They are all signed. And also I have put the line "JmeSystem.setLowPermissions(true); " for just in case :S

One more info. Here is the my applet.html:
[java]<html>
<body>
<applet
archive=“game.jar, jinput.jar, jME3-core.jar, jME3-desktop.jar, jME3-lwjgl.jar, jME3-lwjgl-natives.jar, lwjgl.jar”
codebase="./"
code=“main.GameApplet.class”
width=800
height=600>
</applet>
</body>
</html>[/java]

Please dont say “with the sdk you can deploy it via one click” if you cant stop yourself, instead pls help me understand the protocol on the applet.

2

Due to the native libraries you need an actual certificate. Use the SDK BasicGame template and the “LWJGL Applet” checkbox in the settings to make a lwjgl signed applet.

1 Like
3

Well thx. Can you also tell me where I can find the “LWJGL Applet” checkbox? Which settings are you talking about?

4
@ErayT said: Well thx. Can you also tell me where I can find the “LWJGL Applet” checkbox? Which settings are you talking about?

The project settings, right-click the project.

5
<cite>@normen said:</cite> Due to the native libraries you need an actual certificate. Use the SDK BasicGame template and the "LWJGL Applet" checkbox in the settings to make a lwjgl signed applet.

I was searching on the internet about the lwjgl applets and found that article :
http://lwjgl.org/wiki/index.php?title=Deploying_with_the_LWJGL_Applet_Loader_1_-_Basics

I have two unclear points about this link.
1-) Can I use that approach to deploy my applet? (I am gonna create an applet holding the game canvas)
2-) You said I need an actual certificate; however, in the article it signs the lwjgl applet in the way I have already done. (http://lwjgl.org/wiki/index.php?title=Signing_Jar_Files)

6
@ErayT said: I was searching on the internet about the lwjgl applets and found that article : http://lwjgl.org/wiki/index.php?title=Deploying_with_the_LWJGL_Applet_Loader_1_-_Basics

I have two unclear points about this link.
1-) Can I use that approach to deploy my applet? (I am gonna create an applet holding the game canvas)
2-) You said I need an actual certificate; however, in the article it signs the lwjgl applet in the way I have already done. (http://lwjgl.org/wiki/index.php?title=Signing_Jar_Files)

Please ask the lwjgl team, I can only help you with the SDKs lwjgl Applet creation, which works fine.