Java - NoClassDefFoundError on running

Question

Today I tried to compile my sources through the command prompt:

PS ...\JavaDev\Prog> javac -classpath <libs> -d . -sourcepath src src/com/negi/prog/Prog.java

They compiled successfully.

But when I try to run it, it produces an error:

PS ...\JavaDev\Prog> java -classpath  com.negi.prog.Prog

Exception in thread "main" java.lang.NoClassDefFoundError: com/negi/prog/Prog
Caused by: java.lang.ClassNotFoundException: com.negi.prog.Prog

How can I fix that?

Konstantin Yovkov · Accepted Answer · 2013-06-30T20:55:59.043

2

The classes in your -classpath have to be separated by :

PS ...\JavaDev\Prog> java -classpath "<libs>:com.negi.prog.Prog"

To complete the answer, the different operating systems have different classpath separators. You can check the separator by retrieving the value of the java.class.path property.

edited Jun 30 '13 at 20:55

answered Jun 30 '13 at 20:48

Konstantin Yovkov

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Actually different operating systems have different classpath seporators thus the `java.class.path` property in [System](http://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html). – selig Jun 30 '13 at 20:52
Since he's on Windows (judging by use of the back slash instead of forward slash) he needs to use `;`. [Relevant](http://stackoverflow.com/questions/4528438/classpath-does-not-work-under-linux). – Brian Jun 30 '13 at 20:53
Correct. But my guess was this is the reason the class is not included in the classpath. – Konstantin Yovkov Jun 30 '13 at 20:53
@kocko Absolutely, your answer is correct, just making sure we get complete information. – Brian Jun 30 '13 at 20:54

score 2 · Answer 2 · answered Jun 30 '13 at 20:53

2

By default . (current path) is included in class path, but if you specify -classpath or -cp, then that is overridden. Include . in your classpath:

java -classpath <libs>:. com.negi.prog.Prog

answered Jun 30 '13 at 20:53

Roger Lindsjö

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score 1 · Answer 3 · answered Jun 30 '13 at 20:53

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You need to ensure the current directory is on the classpath when running i.e.

PS ...\JavaDev\Prog> java -classpath <libs>:. com.negi.prog.Prog

answered Jun 30 '13 at 20:53

selig

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Java - NoClassDefFoundError on running

3 Answers3