Introduction
In a previous post, I have explained how you can transform ServiceMix 4 as a Web Application Server. In this new post, I will show you How you can combine the power of Apache Wicket and Spring OSGI services together on ServiceMix 4 with the help of PAX Web.
This mix can be achieved very easily. Only a few steps are required.
Create projects
1) Create a maven project where you will design your spring service and expose it as an OSGI service according to the Spring documentation.
<osgi:service ref="incidentService" interface="org.apache.camel.example.reportincident.service.IncidentService"> </osgi:service>
2) Create a new maven project that you will use to package your Apache web application. The trick here is to modify your web.xml file like this :
a) add listener and context parameter for the Spring OSGI Context Loader
<context-param> <param-name>contextClass</param-name> <param-value> org.springframework.osgi.web.context.support.OsgiBundleXmlWebApplicationContext </param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>
b) Add Spring Factory to Apache (required to allow injection of dependency in java classes of Wicket)
<filter> <filter-name>camel.example.reportincident.web</filter-name> <filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class> <init-param> <param-name>applicationClassName</param-name> <param-value>org.apache.camel.example.reportincident.WicketApplication</param-value> <param-name>applicationFactoryClassName</param-name> <param-value>org.apache.wicket.spring.SpringWebApplicationFactory</param-value> </init-param> </filter>
Please refer to the Apache Wicket Web site for more info about Spring integration
3) create an applicationContext.xml file under WEB-INF folder containing the reference to the OSGI service :
<osgi:reference id="incidentService" interface="org.apache.camel.example.reportincident.service.IncidentService"/>
4) And of course, in your Wicket page, inject dependency using the Wicket annotation :
@SpringBean
private IncidentService incidentService;
Generate bundles and deploy
5) Now generate the bundles (JAR/WAR) and deploy them top of SMX4. Before to deploy the war containing the web project, verify that the following bundles are deployed on SMX4 :
- OPS4J Pax Web - Web Container (0.6.0)
- OPS4J Pax Web - Jsp Support (0.6.0)
- OPS4J Pax Web Extender - WAR (0.5.1)
- OPS4J Pax Web Extender - Whiteboard (0.5.1)
- OPS4J Pax Url - war:, war-i: (0.4.0)
- spring-osgi-web (1.2.0.rc1)
- Wicket (1.3.5)
- Wicket IoC common code (1.3.5)
- Wicket Spring Integration (1.3.5)
- Wicket Spring Integration through Annotations (1.3.5)
- Wicket Extensions (1.3.5)
- Apache ServiceMix Bundles: jetty-6.1.14 (6.1.14.1)