Execute compiler from my java program??

Question

Hi,
How can I call java compiler and interpreter from my own java program?? I've tried this code :
public static void main(String[] args) {
    try {
        Runtime r = Runtime.getRuntime();
        r.exec("javac Test.java");
    } catch (Exception err) {
        err.printStackTrace();
}but it didn't work. An exception was thrown, it sounds something like "error javac=2", or something like that. The exception was thrown on line r.exec. I tried change the command with r.exec("java -version"). But nothing happenned (I thought I will get string with my java version on it, like when I type the same command on console), but no error was thrown too. But when I tried this one : r.exec("java Test"), the exception was thrown. What's going on? I've compiled the Test.java using NetBeans, and moved the Test.class into user folder (C:\Document And settings\Timotius Pamungkas), but get the same exception. I've already set the path and classpath. But when I tried r.exec("calc"), windows calculator appeared.
What's going on?? How can i compile java source code from and execute the calss file or jar file my own java program?

Answer 1

Read this:
When Runtime Exec Won't