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| <h1>Rules of Thumb |
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| <p><a name="RulesofThumb-Configuration"></a></p> |
| |
| <h3>Configuration</h3> |
| |
| <ul> |
| <li>Configuration settings should have configurable defaults at the module, |
| ear, server and cluster level (when clustering is added). For example, |
| security settings should be configurable on a per ejb, ejb jar, ear and |
| server levels. </li> |
| <li>Settings should have a smooth increase in complexity from very simple to |
| complex. For example, a cache setting could start with a simple max-size, |
| and over time the user could increase the complexity by adding |
| configuration for disk paging up to specification of complex flushing |
| rules.</li> |
| </ul> |
| |
| <p><a name="RulesofThumb-Validation"></a></p> |
| |
| <h3>Validation</h3> |
| |
| <ul> |
| <li>Applications should be fully validated before handing it off to the |
| deployment system. This vastly simplifies the deployment system because it |
| assumes that an application is valid. As a corollary, the deployment |
| system should not be complicated with code that tests for invalid |
| deployments or with code to print graceful error messages to a user.</li> |
| </ul> |
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