Maven compiler plug-in configuration to use Java 1.8

pom.xml

<build>
    <plugins>
        <plugin>
             <artifactId>maven-compiler-plugin</artifactId>
             <version>3.3</version>
             <configuration>
                 <source>1.8</source>
                 <target>1.8</target><!-- use 1.7 in your Stash module --> 
             </configuration>
         </plugin>
         <!-- ... -->
    </plugins>
</build