使用控制台时出现java.lang.NoClassDefFoundError

Question

I have a problem with the execution of programs by console. It always throws java.lang.NoClassDefFoundError but if i run the same application with netbeans it works perfectly.What can i do?

Answer 1

You can add classpath in Java by providing option "-cp" or "-classpath" while running Java program.

set classpath there as shown below :

 Set CLASSPATH=.;/com/test/classes

 java -cp $CLASSPATH Test

By default Java CLASSPATH points to current directory denoted by "." and it will look for any class only in current directory.

Answer 2

Your classpath is set differently ie jar(s) on the classpath in NetBeans are not on the classpath when you run the same code from the console.

A quick code snippet which outputs what is on your classpath:

ClassLoader cl = ClassLoader.getSystemClassLoader();

URL[] urls = ((URLClassLoader)cl).getURLs();

for(URL url: urls){ System.out.println(url.getFile()); }

From the console, use the -cp option to add the necessary jars.