maven-javadoc-plugin -> <source>8</source>
diff --git a/pom.xml b/pom.xml
index fa5a219..55a1de2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -253,6 +253,7 @@
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<configuration>
+ <source>8</source>
<additionalparam>-Xdoclint:none</additionalparam>
<stylesheet>java</stylesheet>
<bottom><small>Copyright &copy; 2003-2016, The Apache Software Foundation. All Rights Reserved. Generated ${maven.build.timestamp}</small></bottom>