Use the Java compiler version 1.6

Author: V-Smeets

pom.xml

@@ -44,6 +44,8 @@
  </distributionManagement>
 
  <properties>
+ <maven.compiler.source>1.6</maven.compiler.source>
+ <maven.compiler.target>${maven.compiler.source}</maven.compiler.target>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 
  </properties>