Switching between Java7 and Java8 in Lucene/Solr - Solr Evolved

Switching between Java7 and Java8 in Lucene/Solr - Solr Evolved

Lucene/Solr trunk (the future 6.0 release) is now on Java8, while version 5.x is still on Java7.
Linux and Windows allows one to install a JDK any place in the filesystem, and I use the convention of installing in
/opt/jdk7 and /opt/jdk8. Things are a little more difficult on Mac OS-X however, as you can't chose the install location. Luckily there is a command called java_home to show you where a JDK is installed.

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