added complie plugin to specify compile under Java 1.6

pom.xml

@@ -47,17 +47,33 @@
 			<scope>provided</scope>
 		</dependency>
 	</dependencies>
-	
+
 	<build>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-javadoc-plugin</artifactId>
-        <version>2.8.1</version>
-        <configuration>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
+		<pluginManagement>
+			<plugins>
+				<!-- Ensure compilation is done under Java 6 in all environments -->
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-compiler-plugin</artifactId>
+					<version>2.5.1</version>
+					<configuration>
+						<source>1.6</source>
+						<target>1.6</target>
+						<showDeprecation>true</showDeprecation>
+						<showWarnings>true</showWarnings>
+					</configuration>
+				</plugin>
+			</plugins>
+		</pluginManagement>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-javadoc-plugin</artifactId>
+				<version>2.8.1</version>
+				<configuration>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
 
 </project>