How to get ODEJava to work (org.apache.log4j.Logger not found)

Game Mechanics
#1

Hey everyone, I downloaded odejava, followed the installation instructions found here (http://fivedots.coe.psu.ac.th/~ad/jg2/ch05/worldsCollide.pdf) since the odejava sites instruction links don’t work, and I can not get anything to work. When I call Odejava.getInstance(); I keep getting:

Exception in thread “main” java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at org.odejava.Odejava.(Odejava.java:77)
at Game.createSceneGraph(Game.java:182)
at Game.(Game.java:245)
at Game.main(Game.java:292)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
… 4 more

I am at my wits end. I can import org.apache.log4j.Logger; just fine, and I can even instantiate one using Logger.GetLogger() (im guessing a singleton pattern). So, I have no idea why the odejava is throwing the ClassNotFoundException. Any thoughts?

#2

Wow, 6 hours of trying, then I post here and get it working almost instantly. I have multiple JRE’s installed, and it was missing in one of the JRE’s lib\ext folders (apparently the one being used).

#3

it’s log4j.jar that’s missing - usually this should not be in the JRE… but it’s good that you got it to work properly :slight_smile:

#4

I never understood this dependency…it should be optional. Asking the user to download 100 of irrelevant (to his gaming) libraries is
asking too much.

#5

Well, it is not a good idea to put anything into the jre/ext folder. And this is a very good example, why :). Another good reason, not to do this is, that you might need version A of library XYZ for project P1 while you need version B of the same lib for project P2. You simply cannot do this when the lib resides in the jre/ext folder. Simply put the lib (log4j in your case) in the project’s (ODEJava’s) classpath and everything will be fine.

Marvin