Question

I am working on a project that requires me to understand the basics of the Apache Jakarta Regexp package for Java. I am somewhat unfamiliar with how to inlcude libraries in a java class. This is what im trying to run:

import org.apache.regexp.*;

public class regexpTest {
    public static void main(String[] args) {
        RE r = new RE("a*b");
        boolean match =  r.match("aabb");

        if (match){
            System.out.println("yes");
        }
        else{
            System.out.println("no");
        }
    }
}

I have added Documents\jakarta-regexp-1.5\jakarta-regexp-1.5.jar to my class path, but i get to get it to compile without errors, i have to use:

javac -classpath …\jakarta-regexp-1.5\jakarta-regexp-1.5.jar regexpTest.java

that will compile, but when i try to run it like this :

java -classpath …\jakarta-regexp-1.5\jakarta-regexp-1.5.jar regexpTest

I get an error: “Exception thread “main” java.lang.NoClassDefFoundError: regexpTest”

Any ideas on what im doing wrong?

Answer 1

Is the current directory in your classpath?

http://download.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html

The default class path is the current directory. Setting the CLASSPATH variable or using the -classpath command-line option overrides that default, so if you want to include the current directory in the search path, you must include “.” in the new settings.