UnsupportedClassVersionError on running play application with JDK 1.7

Question

Just now started learning Play framework for my project requirement and my project only build on JDK 1.7 so I have downloaded Play 2.3.9 ve

Answer 1

Although it seemed I was using the same version for java and javac:

• java -version java version "1.8.0_51"
• javac -version javac 1.8.0_51

My problem was (Linux Mint 17.1) that I had installed oracle-java7 and oracle-java8 so somewhere there must be a misconfiguration.

I uninstalled oracle-java7 and everything worked fine to me.