title: Multiple JREs in Linux system
body: <p>In all the tutorials "how to install Oracle Java in Linux" it's said that OpenJDK <strong>must</strong> be purged from system. Is that absolutely necessary? </p>
  
  <p>Is there any way to avoid conflicts between JREs/JDKs from different vendors (e.g. Oracle JDK and OpenJDK) on Linux systems (Linux Mint/Ubuntu in particular)?</p>