Exception in thread “main” java.lang.NoClassDefFoundError: HelloWorld

Question

I\'ve been working on this for about an hour and thumbing through Q&As on stackoverflow but I haven\'t found a proposed solution to my problem. I\'m sorry if this is a d

Answer 1

Problem: Basically, the Exception in thread "main" java.lang.NoClassDefFoundError:

means, that the class which you are trying to run was not found in the classpath.

Solution: you need to add the class or .jar file which contains this class into the java classpath. When you are running a java class from the command line, you need to add the dot (.)

java YourSingleClass -cp .

into the classpath which tells the JVM to search for classes in actual directory.

If you are running a class from a .jar file, you need to add this jar file into the classpath:

java org.somepackage.SomeClass -cp myJarWithSomeClass.jar