How to run java code with Apache Ant

Question

Here is a part of my build.xml:

<target name="run">
    <java jar="${jar.dir}/${Main.class}.jar" 
        fork="yes"
        <assertions>
            <enable />
        </assertions>
    </java>
</target>

or

<target name="run">
    <java classname="${Main.class}" classpath="${classes.dir};${lib.dir}" fork="yes"/>
</target>

---

Here is an example java code:

public class Test {
    public Test() {
        System.out.print("Test2");
    }
    public static void main(String[] args) {
        System.out.println("Test1");
        new Test();
        while(true) {}
    }
}

---

If I run this code from command line I have "Test1" and then "Test2". If I run this code using the Ant I have only "Test1".

How can I solve this problem?

Answer 1

You'll probably find that Ant buffers the output to System.out of your program by line before printing to stdout, and because your program never terminates (the while (true) {}), Ant is waiting for the program to finish before flushing the output of the line. Try changing the Test constructor to use println and you'll see the output.

Answer 2

This should solve the problem.

System.out.flush(); 

Add it before you get into an infinite loop. (EDIT:) and after you call new Test()