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| <h1 class="no_toc" id="precise-error-reporting">Precise Error Reporting</h1> |
| |
| |
| <p>With the multiple levels of configuration, constant overrides, and bean selection, it can be confusing as to how |
| the framework is configured and how it got there. To assist debugging and provide the ability to continue to provide |
| more line-precise error reporting, the configuration loader remembers the location of not only XML elements, |
| but also Java Properties file properties.</p> |
| |
| <p>How it works is instead of storing configuration properties in a plain <code class="language-plaintext highlighter-rouge">java.util.Properties</code> object, we have a special |
| <code class="language-plaintext highlighter-rouge">LocatableProperties</code> class. This class leverages the location classes to store location information for the whole |
| properties file but also individual properties. We use this to gather configuration properties during configuration loading. |
| This will allow us to display at any given point the location of each property setting. This capability should be very |
| useful when trying to determine what XML or Properties file overwrote what and when.</p> |
| |
| <p>Interestingly, in addition to remembering the URI and line number of Properties properties, the parser we “borrowed” |
| from Commons Configuration even gathers preceding comments, which are also stored in the Location object. This means |
| we can leverage the Properties comment-based documentation that we have in the o.a.s.default.properties file |
| or the user’s struts.properties file to further provide useful information in error reports.</p> |
| |
| <p>There are some very interesting possibilities here to increase the transparency of the framework in error and debugging conditions.</p> |
| |
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