EDIT: Recently got it working by making a batch file that does this:

set /p CP=<cp.txt
java -cp %CP%;testing.jar me.pale.main.Main

and cp.txt is this


Recently, I've been in my head about LWJGL and creating games, and have made a simple test thingy. I tried to build the jar using eclipse, but when I run the jar file, it errors out. When I use Command Prompt, this is the output:

D:\>java -jar testing.jar
Picked up _JAVA_OPTIONS: -Xmx8192M
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/lwjgl/LWJGLException
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
        at java.lang.Class.privateGetMethodRecursive(Unknown Source)
        at java.lang.Class.getMethod0(Unknown Source)
        at java.lang.Class.getMethod(Unknown Source)
        at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.LWJGLException
        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)
        ... 7 more

My native folder is correct, I've checked it.

The project runs perfectly fine in the IDE

Here's what is in my build path:

lwgl.jar > NativeLibLoc: [Native Dir]
jre system library [SE-1.8]

I don't know what the problem is, but thank you for anyone's help.

  • \$\begingroup\$ Instead of adding your solution as an edit, you should post it as an Answer below. \$\endgroup\$
    – DMGregory
    Commented Sep 1, 2022 at 13:05

1 Answer 1


According to this StackOverflow answer: https://stackoverflow.com/questions/29334257/java-lang-noclassdeffounderror-org-lwjgl-lwjglexception

I figured it out so I will post it in case anyone else having the same problem stumbles upon this page. I had to use an older version of lwjgl.jar, version 2.9.3 worked from the old lwjgl website http://legacy.lwjgl.org/ .

There is also this StackOverflow answer: https://stackoverflow.com/questions/20044200/java-lang-noclassdeffounderror-with-lwjgl

Try to run it like this:

java -cp lib\win32\lwjgl.jar;Valor.jar Main

The problem is that the -cp option is ignored when -jar is used.

Alternatively, you could extend the class path by adding a Class-Path: entry in your manifest and putting lib\win32\lwjgl.jar in it.

Class-Path: lib\win32\lwjgl.jar

  • \$\begingroup\$ I tried that and it would error out saying that it could not find main class Main or could not find main class [title].jar \$\endgroup\$
    – Pale_Gray
    Commented Jul 20, 2021 at 17:46
  • \$\begingroup\$ @Pale_Gray If it can't find the main class, it might be a directory problem (or just not having a main class, is your main class definitely in the class path?). It's hard to diagnose further without knowing your project setup. \$\endgroup\$
    – Sciborg
    Commented Jul 20, 2021 at 19:17
  • \$\begingroup\$ here's the .jar file and components \$\endgroup\$
    – Pale_Gray
    Commented Jul 20, 2021 at 19:57
  • \$\begingroup\$ imgur.com/a/cjVdTN9 \$\endgroup\$
    – Pale_Gray
    Commented Jul 20, 2021 at 19:59
  • \$\begingroup\$ when I use java -cp C:\Users\*****\Desktop\LWJGL293\lwjgl-2.9.3\jar\lwjgl.jar;testing.jar me.pale.main.Main, it says no lwjgl64 in java.library.path \$\endgroup\$
    – Pale_Gray
    Commented Jul 20, 2021 at 20:03

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