diff --git a/pom.xml b/pom.xml
index 4c89a2eb..c978ded3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -81,8 +81,8 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<maven.compiler.source>1.7</maven.compiler.source>
-		<maven.compiler.target>1.7</maven.compiler.target>
+		<maven.compiler.source>1.6</maven.compiler.source>
+		<maven.compiler.target>1.6</maven.compiler.target>
 		<maven.javadoc.failOnError>false</maven.javadoc.failOnError>
 
 		<activemq.version>4.1.2</activemq.version>
@@ -182,6 +182,28 @@
 				</configuration>
 			</plugin>
 
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>animal-sniffer-maven-plugin</artifactId>
+				<version>1.16</version>
+				<configuration>
+					<signature>
+						<groupId>org.codehaus.mojo.signature</groupId>
+						<artifactId>java16-sun</artifactId>
+						<version>1.0</version>
+					</signature>
+				</configuration>
+				<executions>
+					<execution>
+						<id>check-java16-sun</id>
+						<phase>test</phase>
+						<goals>
+							<goal>check</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+
 		</plugins>
 	</build>
 
diff --git a/spring-ws-core/src/main/java/org/springframework/ws/transport/http/HttpUrlConnection.java b/spring-ws-core/src/main/java/org/springframework/ws/transport/http/HttpUrlConnection.java
index 3c70524c..f38669c0 100644
--- a/spring-ws-core/src/main/java/org/springframework/ws/transport/http/HttpUrlConnection.java
+++ b/spring-ws-core/src/main/java/org/springframework/ws/transport/http/HttpUrlConnection.java
@@ -121,7 +121,7 @@ public class HttpUrlConnection extends AbstractHttpSenderConnection {
 
 	@Override
 	public Iterator<String> getResponseHeaders(String name) throws IOException {
-		Map<String, List<String>> headersListMappedByLowerCaseName = new HashMap<>();
+		Map<String, List<String>> headersListMappedByLowerCaseName = new HashMap<String, List<String>>();
 
 		for (String key : connection.getHeaderFields().keySet()) {
 			if (key != null) {