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| <h1>Collapsed EAR |
| |
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| <p><a name="CollapsedEAR-Onearchive"></a></p> |
| |
| <h1>One archive</h1> |
| |
| <p>The basic idea of this approach is that your Servlets and EJBs are together |
| in your WAR file as one app.</p> |
| |
| <ul> |
| <li>No classloader boundries between Servlets and EJBs</li> |
| <li>EJBs and Servlets can share all third-party libraries (like Spring!) - no EAR required.</li> |
| <li>Can put the web.xml and ejb-jar.xml in the same archive (the WAR file).</li> |
| <li>EJBs can see Servlet classes and vice versa.</li> |
| </ul> |
| |
| <p><a name="CollapsedEAR-NotquiteJ2EE(itistrulyJava EE6)"></a></p> |
| |
| <h1>Not quite J2EE (it is truly Java EE6)</h1> |
| |
| <p>This is very different than J2EE or Java EE 5 as there aren't several |
| levels of separation and classloader hierarchy. This is going to take some |
| getting used to and it should be understood that this style of packaging |
| isn't J2EE compliant. Who would care tough as it is a feature of Java EE 6 |
| we would've been waiting for so long.</p> |
| |
| <p>J2EE classloading rules:</p> |
| |
| <ul> |
| <li>You cannot ever have EJBs and servlets in the same classloader.</li> |
| <li>Three classloader minimum; a classloader for the ear, one for each ejb-jar, and one for each WAR file.</li> |
| <li>Servlets can see EJBs, but EJBs cannot see servlets.</p> |
| |
| <p>To pull that off, J2EE has to kill you on packaging:</li> |
| <li>You cannot have EJB classes and Servlet classes in the same archive.</li> |
| <li>You need at least three archives to combine servlets and ejbs; 1 EAR containing 1 EJB jar and 1 servlet WAR.</li> |
| <li>Shared libraries must go in the EAR and be included in a specially formatted 'Class-Path' entry in the EAR's MANIFEST file.</p> |
| |
| <p>Critically speaking, forcing more than one classloader on an application |
| is where J2EE "jumps the shark" for a large majority of people's needs.</li> |
| </ul> |
| |
| <p><a name="CollapsedEAR-ExamplewithTomcat"></a></p> |
| |
| <h1>Example with Tomcat</h1> |
| |
| <p>If you want to try to work with Servlets/JSP and OpenEJB using Tomcat, see |
| the <a href="openejbx30:tomcat.html">setup page</a> |
| and the "/webapps/ejb-examples" section of the <a href="downloads.html">openejb-examples.zip</a> |
| available on the <a href="http://tomee.apache.org/downloads.html">download page</a>.</p> |
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