เรียกใช้ comand line (cmd) รัน JAVA ผ่าน php ทำอย่างไรครับ

<?php
	$ip = "192.168.104.105";
	$exe= shell_exec("ping -n 3 $ip");
	if(strrpos($exe, "100% loss") > 0)
	{
		 echo "Server Offline";
	}
	else
	{
		echo "Server Online";
	}
?>

$exe= shell_exec("javac HelloWorld.java ");

exec("run.bat");

echo shell_exec("javac A.java set path=C:\Program Files\Java\jdk1.6.0_11\bin 2>&1");
echo shell_exec("java A set path=C:\Program Files\Java\jdk1.6.0_11\bin 2>&1");

echo shell_exec("C:/Progra~1/Java/jdk1.6.0_11/bin/javac A.java  2>&1");
echo shell_exec("C:/Progra~1/Java/jdk1.6.0_11/bin/java A  2>&1");