Lets try to understand the Error:
As the error show the code is built for Java 7. If you try to build in less the Java 7 version. This error will be shown.
So you need to compile your project under < Java 7 version.
if you are using Maven just use Maven version 3.0.5, since Maven
How to Identify the code is built for which Java version ?
Just refer major.minor.version code listed below:
J2SE 8 - 52 J2SE 7 - 51 J2SE 6.0 - 50 J2SE 5.0 - 49 JDK 1.4 - 48 JDK 1.3 - 47 JDK 1.2 - 46 JDK 1.1 - 45
Solution is Either upgrade your Java version to 7 Or change your development JDK configurations to 1.6.