Making Executable Jar file using java Application

Question

Following Program creates the jar file at specified location. but, I wonder why this file does not execute on double clicking on it, in spite of that the Manifest file contain correct main class file name
//MakJar.java
import java.io.*;
public class MakJar
public static void main(String[] args)throws IOException{
Process p;
String str="D:\\Himesh\\JFiles";
try {
BufferedWriter out = new BufferedWriter(new FileWriter(str+"\\mainClass.txt"));
out.write("Main-Class: TestFrame\n");
out.close();
} catch (IOException e) {
try
     p=Runtime.getRuntime().exec("cmd /c D:\\Java6\\jdk1.6.0\\bin\\javac.exe "+str+"\\TestFrame.java");
     p=Runtime.getRuntime().exec("cmd /c D:\\Java6\\jdk1.6.0\\bin\\jar cvmf "+str+"\\mainClass.txt "+str+"\\Demo.jar "+str+"\\*.class");
catch(IOException e)
System.err.println("Error on exec() method");
e.printStackTrace();
}

Answer 1

Sir,
On execute the jar using a "java -jar. . ." command. it gives the error--
"Exception in thread "main" java.lang.NoClassDefFoundError : TestFrame"
On Extracting the files from jar file made by the java program,i found that the manifist file ( containing the name of main class) and t the class file are included in the jar file.
But if I make the jar file manually it works perfectly.I have even reinstalled the java but the problem persists
Same thing happen if i use MS-DOS batch file.
??????If i put the batch file in the same directory and execute it The resulting jar file works,But
??????if the batch file is executed from outside the directory The resulting jar file fails execute.
what should i do???