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<h1>null</h1>
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Licensed to the Apache Software Foundation (ASF) under
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License, Version 2.0 (the "License"); you may not use this file except
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<h1 id="_deploying_in_tomee" class="sect0">Deploying in TomEE</h1>
<div class="paragraph">
<p>Deploying applications in TomEE is as simple as deploying them in
Tomcat.</p>
</div>
<div class="paragraph">
<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>
</div>
<div class="paragraph">
<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>
</div>
<div class="paragraph">
<p>Read on to learn more about packaging EJBs in a WAR file.</p>
</div>
<div class="sect1">
<h2 id="_packaging">Packaging</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_one_archive">One archive</h3>
<div class="paragraph">
<p>The basic idea of this approach is that your Servlets and EJBs are
together in your WAR file as one application.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>No classloader boundaries between Servlets and EJBs</p>
</li>
<li>
<p>EJBs and Servlets can share all third-party libraries (like Spring!)</p>
</li>
<li>
<p>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>
</div>
<div class="sect2">
<h3 id="_not_quite_j2ee_but_it_is_java_ee_6">Not quite J2EE (But it is Java EE 6)</h3>
<div class="paragraph">
<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>
</div>
</div>
<div class="sect2">
<h3 id="_j2ee_classloading_rules">J2EE classloading rules:</h3>
<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.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>You need at least three archives to combine Servlets and EJBs; 1 EAR
containing 1 EJB jar and 1 Servlet WAR.</p>
</li>
<li>
<p>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>
</li>
</ul>
</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>
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