Given a jar file, extract out the `pom.properties` and create a java.util.Properties object from it.

JarList.java

import java.io.*;
import java.util.*;
import java.util.jar.*;

   public class JarList 
   {
       public static void main (String args[]) throws IOException
       {
     if (args.length != 1)
	       {
		   System.out.println("Please provide a JAR filename");
		   System.exit(-1);
	       }
	   JarFile jarFile = new JarFile(args[0]);
	   Enumeration enu = jarFile.entries();
	   while (enu.hasMoreElements())
	       process(jarFile, enu.nextElement());
       }

       private static void process(JarFile jarFile, Object obj) throws IOException
       {
	   JarEntry entry = (JarEntry)obj;
	   String name = entry.getName();
	   if(name.endsWith("pom.properties")) {
	       InputStream is = jarFile.getInputStream(entry);
	       Properties p = new Properties();
	       p.load(is);
	       String g = p.getProperty("groupId");
	       String a = p.getProperty("artifactId");
	       String v = p.getProperty("version");
	       System.out.println(g+":"+a+":"+v);
	   }
       }
   }