Maven Compilation Error: (use -source 7 or higher to enable diamond operator)
Check how your maven-compiler-plugin is configured, it should use java version 7 or higher: <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> For a more complete answer see the one below.