Add a file type

I am trying to upload java files to my WordPress blog but it does not let me upload any files with .java extension.

I get this error:

“.java” has failed to upload due to an error

File type does not meet security guidelines. Try another.

How do I add .java extension so that it allows me to upload java source code?

I am using WordPress version 3.0.4.

Use filter ‘upload_mimes’.

<?php    
add_filter('upload_mimes','add_java_files');

function add_java_files($mimes)
{
    // Add file extension 'extension' with mime type 'mime/type'
    $mimes['java'] = 'text/x-java-source';
    return $mimes;
}