Chapter 25. Configuring Individual JAX-RS Resource Beans

When you scan your path for JAX-RS annotated resource beans, your beans are registered in per-request mode. This means that an instance will be created for every HTTP request served. You will usually require information from your environment. If you run a WAR in a Servlet container with Beta 2 or lower, you can only use JNDI lookups to obtain references to Java EE resources and configuration information. In this case, define your EE configuration (that is, ejb-ref, env-entry, persistence-context-ref, etc.) in the web.xml of your RESTEasy WAR file. Then, within your code, perform JNDI lookups in the java:comp namespace. For example:

web.xml

<ejb-ref>
  <ejb-ref-name>ejb/foo</ejb-ref-name>
  ...
</ejb-ref>

<ejb-ref>
  <ejb-ref-name>ejb/foo</ejb-ref-name>
  ...
</ejb-ref>

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Resource Code:

@Path("/")
public class MyBean {

   public Object getSomethingFromJndi() {
      new InitialContext.lookup("java:comp/ejb/foo");
   }
...
}

@Path("/")
public class MyBean {

   public Object getSomethingFromJndi() {
      new InitialContext.lookup("java:comp/ejb/foo");
   }
...
}

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You can also configure and register your beans manually through the Registry. In a WAR-based deployment, you must write a specific ServletContextListener to do this. The listener lets you obtain a reference to the Registry, like so:

public class MyManualConfig implements ServletContextListener
{
   public void contextInitialized(ServletContextEvent event)
   {

      Registry registry = (Registry) event.getServletContext().getAttribute(Registry.class.getName());

   }
...
}

public class MyManualConfig implements ServletContextListener
{
   public void contextInitialized(ServletContextEvent event)
   {

      Registry registry = (Registry) event.getServletContext().getAttribute(Registry.class.getName());

   }
...
}

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We recommend investigating Spring Integration and the Embedded Container's Spring Integration for a full understanding of this process.

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Chapter 25. Configuring Individual JAX-RS Resource Beans

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