How to add jar files and compile using command prompt? (Error: A JNI error has occured,Please Check your Installation)

Question

I forked one project from github and when i want to run it gives error. I added org.json jar file to jdk\lib and also set the Path variable to it. I compiled code but it got no errors but when i run it i get exception as follows : (and I am running it using command prompt)

Error: A JNI error has occurred, please check your installation and
try again Exception in thread "main" java.lang.NoClassDefFoundError:
org/json/JSONExceptio n
        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.json.JSONException
        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

Answer 1

Add required jar to classpath like this:

1. For *nix-like systems:

   export CLASSPATH=<path-to-app>/myapp.jar:<path-to-app>/lib/json.jar:.
   java MyApp
   

2. For Windows:

   set CLASSPATH=<path-to-app>/myapp.jar;<path-to-app>/lib/json.jar;.
   java MyApp
   

...or via manifest:

Manifest-Version: 1.0
Main-Class: MyApp
Class-Path: /lib/json.jar