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| <h1>Deploying in TomEE</h1> |
| |
| <p>Deploying applications in TomEE is as simple as deploying them in Tomcat. </p> |
| |
| <p>You could deploy your application in Eclipse just like how you would deploy with Tomcat. For an example, <a href="tomee-and-eclipse.html">tomee-and-eclipse</a> shows how to use TomEE with Eclipse.</p> |
| |
| <p>Or you can simply package your application as a standard <strong>WAR</strong> file and copy it to the <strong>[TomEE]/webapps</strong> folder, or as an <strong>EAR</strong> file and copy it to the <strong>[TomEE]/apps</strong> folder.</p> |
| |
| <p>Read on to learn more about packaging EJBs in a WAR file.</p> |
| |
| <h3>Packaging</h3> |
| |
| <p><a name="CollapsedEAR-Onearchive"></a></p> |
| |
| <h4>One archive</h4> |
| |
| <p>The basic idea of this approach is that your Servlets and EJBs are together in your WAR file as one application.</p> |
| |
| <ul> |
| <li>No classloader boundaries between Servlets and EJBs</li> |
| <li>EJBs and Servlets can share all third-party libraries (like Spring!) </li> |
| <li>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> |
| |
| <h4>Not quite J2EE (But it is Java EE 6)</h4> |
| |
| <p>This is very different than J2EE or Java EE 5 as there are not several levels of separation and classloader hierarchy any more. <br /> |
| This may take some getting used to and it is important to understand that this style of packaging is <strong>not</strong> J2EE compliant. <br /> |
| You should not worry though, as it is an accepted feature of Java EE 6.</p> |
| |
| <h4>J2EE classloading rules:</h4> |
| |
| <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> |
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