running -jar file from php code

I want to run -开发者_Python百科jar file from my php script, my -jar file run perfectly through commandline but i want to integrate it to my website but it is not working properly and also not provide me any error. my code is below

if (isset($_POST['Export'])) { 
  exec('java -Xmx1024M -jar C:\UploadTest-1_2.jar http://localhost:8080/packaging/Package C:\book\testbook.pdf –pass park345');
  echo 'export button clicked';
}

output is:

export button clicked but -jar not doing needful.

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• Is Java on the path?

Try the command with "java -version", if you don't get output, Java is not on the PATH defined within the PHP environment.

• Is the environment locked down?

When running PHP code, one generally doesn't allow any kind of execution to take place, as people could attempt to hijack the PHP environment to place code on the server which wasn't there. This means that you will have to take into account any type of chroot'ing, acl controls, permissions, selinux, and web server configurations which make it harder to run items without a clear knowledge (that means prior configuration) that the application should be allowed to run.