How can I execute a Java program within a php script?

Question

I am writing a simple web upload script. The goal is to upload a file using php, and then calling a java program to process this file.
I have done the work for uploading

Answer 1

&1");//shows # of errors
echo "
";
echo exec("java theNameOfYourJavaProgram 2>&1");//this line executes it
echo "
";
echo shell_exec("javac theNameOfYourJavaProgram.java 2>&1 ");//compiles it 

?>