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| <small><a href="./../index.html">Home</a> » <a href="./../application-composer/">Application Composer</a></small><br> |
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| <h1>Application Composer History</h1> |
| |
| <p>ApplicationComposer can look like a long story but following it you'll realize it is finally quite natural.</p> |
| |
| <h2>Internal tool</h2> |
| |
| <p>TomEE (former OpenEJB) is an Application Server. One of the most important task writing an Application Server |
| is to ensure the implemented features do what is expected. However it is hard to write N test applications, in N modules |
| to ensure it works smoothly. In particular when you want to test a small part of the whole server.</p> |
| |
| <p>So you immediately think to mocking what is not needed. It works but has a big pitfall: test is often a noop or hide |
| a lot of issues.</p> |
| |
| <p>So the idea came to be able to shortcut the part we don't care much about runtime: the application packaging.</p> |
| |
| <p>Here what is the ApplicationComposer: an (originally test) API to create a EE application programmatically.</p> |
| |
| <h2>Designs</h2> |
| |
| <p>ApplicationComposer design was aligned on this simple need. An ApplicationComposer "test" (browsing other pages you'll see |
| it is much more than test today) is composed of mainly 2 parts:</p> |
| |
| <ul> |
| <li>modules: methods describing a module of an application. It can be a persistence.xml, an ejb-jar.xml, a web.xml...but all programmatically.</li> |
| <li>configuration: container configuration allowing to interact with container (creating resources for instance)</li> |
| </ul> |
| |
| <h2>Test but not only</h2> |
| |
| <p>ApplicationComposer was originally a JUnit only runner but was pretty quickly extended to TestNG too and |
| today you can even use it to write <code>main(String[])</code> - even in a shade!</p> |
| |
| <p>API was greatly simplified and it allows you pretty easily to deploy with a simple shade a JAXRS/JAXWS/JMS service!</p> |
| |
| <h2>Going further</h2> |
| |
| <p>If you want to go further you can browse:</p> |
| |
| <ul> |
| <li><a href="getting-started.html">Getting Started</a></li> |
| <li><a href="advanced.html">Advanced</a></li> |
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