| <html><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Programmatic Access to the Servlet Context</title><meta content="DocBook XSL Stylesheets V1.76.0" name="generator"><link rel="home" href="index.html" title="Virgo Programmer Guide"><link rel="up" href="ch04.html" title="Chapter 4. Developing Applications"><link rel="prev" href="ch04s05.html" title="Using Spring, Spring DM, and Blueprint"><link rel="next" href="ch04s07.html" title="Web Application Manifest Processing"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table summary="Navigation header" width="100%"><tr><td align="left" width="20%"><a accesskey="p" href="ch04s05.html">Prev</a> </td><th align="center" width="60%"> </th><td align="right" width="20%"> <a accesskey="n" href="ch04s07.html">Next</a></td></tr></table><hr></div><div class="section" title="Programmatic Access to the Servlet Context"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="developing-applications-programmatic-access"></a>Programmatic Access to the Servlet Context</h2></div></div></div><p> | |
| This section describes how to programmatically access the servlet context to obtain the WebApplicationContext or the BundleContext. | |
| </p><div class="section" title="Programmatic Access to Web Features"><div class="titlepage"><div><div><h3 class="title"><a name="developing-applications-programmatic-access-web"></a>Programmatic Access to Web Features</h3></div></div></div><div class="section" title="Programmatic Access to the WebApplicationContext"><div class="titlepage"><div><div><h4 class="title"><a name="developing-applications-programmatic-access-web-application-context"></a>Programmatic Access to the WebApplicationContext</h4></div></div></div><p> | |
| The Virgo Server for Apache Tomcat automatically creates a <code class="literal">WebApplicationContext</code> | |
| for Web Application Bundles and WAR files. When used in conjunction with an | |
| an auto-configured Spring MVC <code class="literal">DispatcherServlet</code>, | |
| there is generally no need to access the <code class="literal">WebApplicationContext</code> | |
| programmatically, since all components of the web application are configured | |
| within the scope of the <code class="literal">WebApplicationContext</code> | |
| itself. However, if you wish to access the <code class="literal">WebApplicationContext</code> | |
| you can do so via the web application’s <code class="literal">ServletContext</code>. | |
| Virgo stores the bundle’s | |
| <code class="literal">WebApplicationContext</code> in the ServletContext under | |
| the attribute name "<code class="literal">BSN-ApplicationContext</code>", where | |
| <code class="literal">BSN</code> is the <code class="literal">Bundle-SymbolicName</code> | |
| of your WAR or Web Application Bundle. | |
| </p><p> | |
| Alternatively, since Virgo also stores the | |
| <code class="literal">WebApplicationContext</code> under the attribute name | |
| with the value of the <code class="literal">WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE</code> | |
| constant, you may choose to use Spring MVC’s WebApplicationContextUtils’ | |
| <code class="literal">getWebApplicationContext(servletContext)</code> | |
| or | |
| <code class="literal">getRequiredWebApplicationContext(servletContext)</code> | |
| methods to access the <code class="literal">WebApplicationContext</code> without providing | |
| an explicit attribute name. | |
| </p></div><div class="section" title="Programmatic Access to the BundleContext"><div class="titlepage"><div><div><h4 class="title"><a name="developing-applications-programmatic-access-web-bundle-context"></a>Programmatic Access to the BundleContext</h4></div></div></div><p> | |
| As required by the OSGi Web Applications specification, you can access the | |
| <code class="literal">BundleContext</code> of your WAR or Web Application Bundle via the web application’s | |
| <code class="literal">ServletContext</code>. The bundle context is stored in the | |
| <code class="literal">ServletContext</code> under the attribute name <code class="literal">osgi-bundlecontext</code>. | |
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