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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)