title: Upgrade jdk version of Tomcat docker container to 1.8
body: <p>i've a web application on windows running from eclipse, with xampp for apache and mysql. It use jdk v <code>1.8</code>.</p>
  
  <p>Now, i want to deploy in inside a docker tomcat container. I've created a container from tomcat official image... but i've saw that its jdk version is <code>1.7</code> ... so there are some error when i try to run web-app under container (from tomcat logs i see <code>unsupported major.minor version 52.0 (unable to load class)</code></p>
  
  <p>So.. how can i solve my problem?</p>