find from which jar some class is taken. Example: $ java -cp .:/$CLASSPATH find_jar org.slf4j.Logger file:/xxxx/classes/slf4j-api-1.7.5.jar $

find_jar.java

import java.security.CodeSource;

public class find_jar {
    public static void main(String[] args) throws Exception {
       if (args.length != 1 ) {
         System.err.println("Usage: find <class name>");
         System.exit(1);
       }
       Class c = Class.forName(args[0]);
       CodeSource codeSource = c.getProtectionDomain().getCodeSource();
       System.out.println(codeSource.getLocation());
    }
}