Online Compiler

[T. N.V.Pandian]

Hi Friends,
I need to develop a webapplication (Online Java Compiler) ,which gets .java file as input and compiles it and then run it.The output as well as error messages(which normally we got in the console) should be dispalyed in the browser.

I have used the following code snippet in my JSP.

 Runtime.getRuntime().exec("javac filename");   

It compiles the java file and produces the class file.The problem is,in case of any errors(compilation or runtime),i didn't get any error meassages in the browser.Also,i am not sure how to display the output to the browser.

Please help me to display the error messages as well as the output to the browser window.

Thanks in Advance.
TNVP

[Ulf Dittmer]

In Java 6 you can use the javax.tools.JavaCompiler class to drive the compiler from within Java code, and get at its output.

You should use a very strict SecurityManager to execute the code, lest it interferes with the server, unintentionally or otherwise.

[Campbell Ritchie]

And there is a lot more to Runtime.exec() than that. Look for the article entitled "when Runtime.exec() won't" on a Google search.

[jack wenttohill]

Its easy to do but difficult to maintain.

one applet handler
http://www.innovation.ch/java/java_compile.html

When you develop just think of a simple scenario:

Some body likes to compile and run a java file with infinity loop.
Or inside it using some Runtime.exec('System critical command'), how you are going to handle them.

Thanks
Jack