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A tuscany provided servlet filter (org.apache.tuscany.sca.host.webapp.TuscanyServletFilter) is configured to startup/shutdown the Tuscany runtime when the web application is started or stopped. The tuscany filter is also responsible to dispatch HTTP requests to HTTP-based bindings such as Web Services, JSONRPC and Atom/RSS Feed. Figure 1 below shows how the tuscany servlet filter bridges web application to SCA.

As illustrated in Figure 2, there are a few important files or folders in the WAR:

• META-INF/sca-contribution.xml: Defines the deployable composites for a given contribution
• WEB-INF/web.xml: Configures the web application with a tuscany servlet filter
• WEB-INF/geronimo-web.xml: Configures the web application to provide geronimo-specific deployment options
• WEB-INF/lib: Contains all the required tuscany jars and their dependencies

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• !tuscany-war.jpg|align=center!
  

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  web.xml web.xml

2.1 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>

  <display-name>Apache Tuscany Calculator Web Service Sample</display-name>
    <filter>
        <filter-name>tuscany</filter-name>
        <filter-class>org.apache.tuscany.sca.host.webapp.TuscanyServletFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>tuscany</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

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<?xml version="1.0" encoding="UTF-8"?>
<contribution xmlns="http://www.osoa.org/xmlns/sca/1.0"
              targetNamespace="http://sample"
              xmlns:sample="http://sample">
   <deployable composite="sample:Calculator"/>
</contribution>

 
The  Calculator.composite is one such deployable sca composite and is defined as follows.

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In Eclipse, following the menu: File - -> Import - -> General --> Exising Projects into Workspace.

4. Configure the maven pom.xml to generate web.xml and geronimo-web.xml automatically

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