Can't run NEHEs samples.

[redneon]

I'm trying to familiarise myself with the compilation and running of lwjgl before I start programming it. I downloaded NEHEs Lesson 2 and extracted the .jar. I entered the directory and compiled it like this...

javac -cp lwjgl.jar Lesson02.java

Which compiled fine. Obviously I copied lwjgl.jar into the same directory. When I go to run the example like this...

java -cp lwjgl.jar Lesson02

...however I get an error saying...

Exception in thread "main" java.lang.NoClassDefFoundError: Lesson02

I've also tried "java -Djava.library.path=native -cp lwjgl.jar Lesson2" but I get the same problem.

Any ideas?

[kevglass]

You need to include the current directory in your class path since thats where Lesson02.class is.

java -cp .;lwjgl.jar Lesson02

(use a : instead if you're on Unix).

Kev

[redneon]

You need to include the current directory in your class path since thats where Lesson02.class is.

java -cp .;lwjgl.jar Lesson02

When I do "java -cp .;lwjgl.jar Lesson02" I get a different error...

Exception in thread "main" java.lang.UnsatisfiedLinkError: no lwjgl in java.libr
ary.path
       at java.lang.ClassLoader.loadLibrary(Unknown Source)
       at java.lang.Runtime.loadLibrary0(Unknown Source)
       at java.lang.System.loadLibrary(Unknown Source)
       at org.lwjgl.Sys.<clinit>(Sys.java:61)
       at org.lwjgl.opengl.Display.<clinit>(Display.java:96)
       at Lesson02.createWindow(Lesson02.java:127)
       at Lesson02.init(Lesson02.java:147)
       at Lesson02.run(Lesson02.java:56)
       at Lesson02.main(Lesson02.java:47)

Exception in thread "main" java.lang.UnsatisfiedLinkError: no lwjgl in java.libr
ary.path
       at java.lang.ClassLoader.loadLibrary(Unknown Source)
       at java.lang.Runtime.loadLibrary0(Unknown Source)
       at java.lang.System.loadLibrary(Unknown Source)
       at org.lwjgl.Sys.<clinit>(Sys.java:61)
       at org.lwjgl.opengl.Display.<clinit>(Display.java:96)
       at Lesson02.createWindow(Lesson02.java:127)
       at Lesson02.init(Lesson02.java:147)
       at Lesson02.run(Lesson02.java:56)
       at Lesson02.main(Lesson02.java:47)

Any ideas?

[kevglass]

Thats because you haven't got the native library somewhere that java can find it. You need the .dll or .so (on linux) either:

- In the local directory

or

- Specified in the system property java.library.path, i.e.
    java -Djava.libarary.path=<location of naive libs> -cp .;lwjgl.jar Lesson02

Kev

[redneon]

Thanks that's worked. One question though. Why do I still need the .jar file when I have the .dll? Surely the .dll should encompas everything?

[kevglass]

Nope, in the land of java we have native stuff to bind to specific system dependent things and pretty java stuff that's platform agnostic. The dll just contains the native stuff.

Kev