reading a file thats located in a inner jar

gistfile1.java

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

public class JarReader {
  public static void main(String args[]) {
    try {
      String jarName = "specj.ear";
      FileInputStream fin = new FileInputStream(jarName);
      JarInputStream jin = new JarInputStream(fin);
      ZipEntry ze = null;
      while ((ze = jin.getNextEntry()) != null) {
        if (ze.getName().endsWith("insurance.war")) {
          JarInputStream jin2 = new JarInputStream(jin);
          ZipEntry ze2 = null;
          while ((ze2 = jin2.getNextEntry()) != null) {
            if(ze2.getName().endsWith("persistence.xml")) {
              // this is bit of a hack to avoid stream closing,
              FilterInputStream in = new FilterInputStream(jin2) {
                public void close() throws IOException { }
              };
              BufferedReader rdr = new BufferedReader(new InputStreamReader(in));
              StringBuilder sb = new StringBuilder();
              for (int c = 0; (c = rdr.read()) != -1;) {
                sb.append((char) c);
              }
              System.out.println(sb.toString());
            }
          }
        }
      }
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

}