add current version displayed when mouse-over Help

pom.xml

@@ -289,6 +289,13 @@
                 <version>${maven-war-plugin.version}</version>
                 <configuration>
                     <warName>petclinic</warName>
+					<!-- http://stackoverflow.com/questions/2712970/how-to-get-maven-artifact-version-at-runtime -->
+					<archive>
+						<manifest>
+							<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
+							<addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
+						</manifest>
+					</archive>
                 </configuration>
             </plugin>
             <!-- gDickens: Include the Builders and Natures -->

src/main/java/org/springframework/samples/petclinic/web/VersionServlet.java

@@ -0,0 +1,62 @@
+package org.springframework.samples.petclinic.web;
+
+import java.io.IOException;
+import java.util.Properties;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * http://stackoverflow.com/questions/14934299/how-to-get-package-version-at-running-tomcat
+ * http://stackoverflow.com/questions/2712970/how-to-get-maven-artifact-version-at-runtime
+ * http://stackoverflow.com/questions/809775/what-does-the-servlet-load-on-startup-value-of-0-zero-signify
+ * 
+ * Example of MANIFEST.MF from META-INF/
+<pre>
+Manifest-Version: 1.0
+Implementation-Vendor: Funshion
+Implementation-Title: atlas-app
+Implementation-Version: 1.1.5.M2.0-SNAPSHOT
+Implementation-Vendor-Id: com.funshion.microlens
+Built-By: weibl
+Build-Jdk: 1.6.0_37
+Specification-Vendor: Funshion
+Specification-Title: atlas-app
+Created-By: Apache Maven 3.0.4
+Specification-Version: 1.1.5.M2.0-SNAPSHOT
+Archiver-Version: Plexus Archiver
+<pre/>
+ * @author Paul Verest 
+ * Reviewer
+ * @since 2013-3-18
+ */
+public class VersionServlet extends HttpServlet {
+	private static final long serialVersionUID = -2805284042253311925L;
+	protected static final Logger logger = LoggerFactory.getLogger(VersionServlet.class);
+
+	public static String version = "UNDEFINED";
+	
+	@Override
+	public void init() throws ServletException {
+		version  = getClass().getPackage().getImplementationVersion();	
+		if (version==null) {
+			Properties prop = new Properties();
+			try {
+				prop.load(getServletContext().getResourceAsStream("/META-INF/MANIFEST.MF"));
+				version = prop.getProperty("Implementation-Version");
+			} catch (IOException e) {
+				logger.error(e.toString());
+			}
+		}
+		logger.info("Starting Spring Pet Clinic application version "+version);
+	}
+	
+	@Override
+	public void destroy() {
+		logger.info("Stopping Spring Pet Clinic application version "+version);
+	}
+
+}

src/main/webapp/META-INF/MANIFEST.MF

@@ -0,0 +1,10 @@
+Manifest-Version: 1.0
+Implementation-Title: petclinic
+Implementation-Version: 1.0.0-SNAPSHOT
+Implementation-Vendor-Id: org.springframework.samples
+Build-Jdk: 1.6.0_37
+Built-By: weibl
+Specification-Title: petclinic
+Created-By: Apache Maven 3.0.4
+Specification-Version: 1.0.0-SNAPSHOT
+

src/main/webapp/WEB-INF/jsp/fragments/bodyHeader.jsp

@@ -1,5 +1,6 @@
 <%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
 <%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
+<%@page import="org.springframework.samples.petclinic.web.VersionServlet"%>
 
 <spring:url value="/resources/images/banner-graphic.png" var="banner"/>
 <img src="${banner}"/>
@@ -16,8 +17,8 @@
             <li style="width: 90px;"><a href="<spring:url value="/oups.html" htmlEscape="true" />"
                                         title="trigger a RuntimeException to see how it is handled"><i
                     class="icon-warning-sign"></i> Error</a></li>
-            <li style="width: 80px;"><a href="#" title="not available yet. Work in progress!!"><i
+            <li style="width: 80px;"><a href="#" title="not available yet. Work in progress!!
-                    class=" icon-question-sign"></i> Help</a></li>
+Spring Pet Clinic application v<%= VersionServlet.version %> "><i class=" icon-question-sign"></i> Help</a></li>
         </ul>
     </div>
 </div>

src/main/webapp/WEB-INF/web.xml

@@ -86,4 +86,11 @@ see here: http://static.springsource.org/spring/docs/current/spring-framework-re
         <servlet-name>petclinic</servlet-name>
     </filter-mapping>
 
+	<!-- The first servlet to get loaded to know app version  -->
+	<servlet>
+		<servlet-name>versionServlet</servlet-name>
+		<servlet-class>org.springframework.samples.petclinic.web.VersionServlet</servlet-class>
+		<load-on-startup>0</load-on-startup>
+	</servlet>
+
 </web-app>