tweak the compiler settings

frameworks/Java/netty/pom.xml

@@ -43,10 +43,10 @@
 				<inherited>true</inherited>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>2.3.2</version>
+				<version>3.5</version>
 				<configuration>
-					<source>1.7</source>
-					<target>1.7</target>
+					<source>1.8</source>
+					<target>1.8</target>
 					<optimize>true</optimize>
 					<debug>false</debug>
 				</configuration>