latest/docs/collapsed-ear.html - tomee-site-pub - Git at Google

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               <h1>Collapsed EAR</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <h1 id="_one_archive" class="sect0">One archive</h1>
 <div class="paragraph">
 <p>The basic idea of this approach is that your Servlets and EJBs are
 together in your WAR file as one app.</p>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>No classloader boundries between Servlets and EJBs</p>
 </li>
 <li>
 <p>EJBs and Servlets can share all third-party libraries (like Spring!) -
 no EAR required.</p>
 </li>
 <li>
 <p>Can put the web.xml and ejb-jar.xml in the same archive (the WAR
 file).</p>
 </li>
 <li>
 <p>EJBs can see Servlet classes and vice versa.</p>
 </li>
 </ul>
 </div>
 <h1 id="_not_quite_j2ee_it_is_truly_java_ee6" class="sect0">Not quite J2EE (it is truly Java EE6)</h1>
 <div class="paragraph">
 <p>This is very different than J2EE or Java EE 5 as there aren&#8217;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&#8217;t J2EE compliant. Who would care tough as it is a feature
 of Java EE 6 we would&#8217;ve been waiting for so long.</p>
 </div>
 <div class="paragraph">
 <p>J2EE classloading rules:</p>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>You cannot ever have EJBs and servlets in the same classloader.</p>
 </li>
 <li>
 <p>Three classloader minimum; a classloader for the ear, one for each
 ejb-jar, and one for each WAR file.</p>
 </li>
 <li>
 <p>Servlets can see EJBs, but EJBs cannot see servlets.</p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p>To pull that off, J2EE has to kill you on packaging: * You cannot have
 EJB classes and Servlet classes in the same archive. * You need at least
 three archives to combine servlets and ejbs; 1 EAR containing 1 EJB jar
 and 1 servlet WAR. * Shared libraries must go in the EAR and be included
 in a specially formatted 'Class-Path' entry in the EAR&#8217;s MANIFEST file.</p>
 </div>
 <div class="paragraph">
 <p>Critically speaking, forcing more than one classloader on an application
 is where J2EE "jumps the shark" for a large majority of people&#8217;s needs.</p>
 </div>
 <h1 id="_example_with_tomcat" class="sect0">Example with Tomcat</h1>
 <div class="paragraph">
 <p>If you want to try to work with Servlets/JSP and OpenEJB using Tomcat,
 see the openejbx30:tomcat.html[setup page] 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>
 </div>
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	<h1>Collapsed EAR</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<h1 id="_one_archive" class="sect0">One archive</h1>
	<div class="paragraph">
	<p>The basic idea of this approach is that your Servlets and EJBs are
	together in your WAR file as one app.</p>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>No classloader boundries between Servlets and EJBs</p>
	</li>
	<li>
	<p>EJBs and Servlets can share all third-party libraries (like Spring!) -
	no EAR required.</p>
	</li>
	<li>
	<p>Can put the web.xml and ejb-jar.xml in the same archive (the WAR
	file).</p>
	</li>
	<li>
	<p>EJBs can see Servlet classes and vice versa.</p>
	</li>
	</ul>
	</div>
	<h1 id="_not_quite_j2ee_it_is_truly_java_ee6" class="sect0">Not quite J2EE (it is truly Java EE6)</h1>
	<div class="paragraph">
	<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>
	</div>
	<div class="paragraph">
	<p>J2EE classloading rules:</p>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>You cannot ever have EJBs and servlets in the same classloader.</p>
	</li>
	<li>
	<p>Three classloader minimum; a classloader for the ear, one for each
	ejb-jar, and one for each WAR file.</p>
	</li>
	<li>
	<p>Servlets can see EJBs, but EJBs cannot see servlets.</p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p>To pull that off, J2EE has to kill you on packaging: * You cannot have
	EJB classes and Servlet classes in the same archive. * You need at least
	three archives to combine servlets and ejbs; 1 EAR containing 1 EJB jar
	and 1 servlet WAR. * Shared libraries must go in the EAR and be included
	in a specially formatted 'Class-Path' entry in the EAR’s MANIFEST file.</p>
	</div>
	<div class="paragraph">
	<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.</p>
	</div>
	<h1 id="_example_with_tomcat" class="sect0">Example with Tomcat</h1>
	<div class="paragraph">
	<p>If you want to try to work with Servlets/JSP and OpenEJB using Tomcat,
	see the openejbx30:tomcat.html[setup page] 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>
	</div>
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