title: How can I detect if java is installed or not and knowing its version, without using java applet to check and without using javascript?
body: <p>Is that possible? </p>
  
  <p>before entering a site, it should check whether java is installed and it has to be of a specific version before redirecting to the designated page.</p>
  
  <p>javascript cannot be used because it can be turned off by the user.<br>
  java applet cannot be used to check as it can disabled by the user</p>
  
  <p>thank you.</p>