Question

I m trying to compile an open source software . The build works fine and results into a jar file “five-server.jar”. When I try to run this file from cmd , I get these errors.

C:\Users\vickey\code\five-server\dist\main>java -jar five-server.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/swt/SWTError
Caused by: java.lang.ClassNotFoundException: org.eclipse.swt.SWTError
        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)
Could not find the main class: org.devtcg.five.Main. Program will exit.

any suggestion what is wrong?

Answer 1

You have to set the classpath so that it includes at least the class org.eclipse.swt.SWTError
or the jar containing it:

java -classpath path/to/jar/containing/org.eclipse.swt.SWTError -jar five-server.jar

You should also set the Main-class attribute in the manifest file in the five-server.jar