Java - Library path error

Question

I'm trying to start my java game but I have some troubles with the java command line:

Here is what I type:

C:\>java -Djava.library.path=%cd%\lib -jar game.jar

And here is what I got:

Exception in thread "main" java.lang.NoClassDefFoundError: org/lwjgl/LWJGLException
    at com.game.Main.main(Main.java:7)
    Caused by: java.lang.ClassNotFoundException: org.lwjgl.LWJGLException
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 1 more

I can start my game with Eclipse (With Run as Java Application) but after the menu I got the following error:

Exception in thread "Thread-5" java.lang.UnsatisfiedLinkError: no lwjgl in java.library.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$1.run(Sys.java:72)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.lwjgl.Sys.doLoadLibrary(Sys.java:65)
    at org.lwjgl.Sys.loadLibrary(Sys.java:81)
    at org.lwjgl.Sys.<clinit>(Sys.java:98)
    at org.lwjgl.opengl.Display.<clinit>(Display.java:129)
    at com.game.displaygui.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

lwjgl.jar has been put into the folder \lib.

Could you explain me with I got that?

Thanks.

Jack · Accepted Answer · 2012-04-08 14:34:19Z

9

This because lwjgl library is made by two components:

the .jar file which contains Java code
and the native binary library (which can be .so or .dll or .dylib according to your OS)

The first error you are getting is because you are setting the library path, that should contain the native library, but it does contain the .jar. So you get a java.lang.NoClassDefFoundError because you should set either the library path to the folder that contains native library, either the classpath to contain the real lwjgl.jar file.

The second error that you get with Eclipse is a successive step: your classpath contains the jar library but it is not able to find the native library attached to it, you can fix it in the following way:

enter image description here

answered Apr 8, 2012 at 14:34

Jack

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giorashc · Accepted Answer · 2012-04-08 14:33:19Z

0

You should specify explicitly which lib files to include (seperated by ;) :

-cp %cd%\lib\lwjdl.jar;%cd%\lib\<another-lib>.jar

Don't be tempted to use the wildcard * as it will cause more harm than good (from previous experience :))

answered Apr 8, 2012 at 14:33

giorashc

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Perception · Accepted Answer · 2012-04-08 14:35:09Z

0

You use the java.library.path option to specify the location of native libraries to load. In the location pointed to by that option you would place all dll or .so files required by LWJGL. On the other hand, you need to make sure that all required JAR files are on your classpath, via the -classpath option. Currently, you have your JAR files in the wrong directory.

answered Apr 8, 2012 at 14:35

Perception

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1 Comment

Manitoba Over a year ago

I don't understand what I'm supposed to do here?

j0k · Accepted Answer · 2012-10-03 11:34:16Z

0

In Eclipse, if you using maven.

Add the following to the project "Run" : "VM options" .

-Djava.library.path=yourpath/youproject/java/target/natives

edited Oct 3, 2012 at 11:34

j0k

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answered Aug 31, 2012 at 17:36

Kyght

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