I have created an executable jar and it works fine. For the testing purpose, I have used a dummy variable in the main method.
Instead, I need to pass a string variab
shell_exec("java -jar your_JAR.jar arg1 arg2");
you can also execute Java at all by using exec instead of shell_execute, giving it $output and & $return_var variables (see the linked manual page) and seeing what they contain after the call.
shell_execute
$output
$return_var