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| <h1 class="page">Web Console Logging</h1> |
| <div class="paragraph"> |
| <p>The Web Console does not provide its own mechanism for logging. |
| Rather the Servlet Container logging mechanism is used by calling the <code>GenericServlet.log</code> methods for logging. |
| It is expected by the OSGi Http Service implementation implements these <code>log</code> methods writing to the OSGi Log Service.</p> |
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| <div class="paragraph"> |
| <p>The drawback of using servlet container logging is that we have no control over the logging levels used and applied to log messages. |
| To at least allow some level of log message filtering the Web Console can be configured with a logging level using the <code>loglevel</code> property of the <em>Apache Felix OSGi Management Console</em> (<code>org.apache.felix.webconsole.internal.servlet.OsgiManager</code>).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>AbstractWebConsolePlugin</code> class provides two addition <code>log</code> methods taking a <code>level</code> parameter which allow plugins to filter certain log messages:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
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| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>log(int level, String message)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Calls <code>GenericaServlet.log(String)</code> if the configured log level is less than or equal to the <code>level</code> parameter.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>log(int level, String message, Throwable t)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Calls <code>GenericaServlet.log(String, Throwable)</code> if the configured log level is less than or equal to the <code>level</code> parameter.</p></td> |
| </tr> |
| </tbody> |
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| <div class="paragraph"> |
| <p><em>Note 1:</em> The <code>level</code> parameter is just used for filtering calls to the <code>GenericeServlet.log</code> methods and cannot define the actual log level used by the servlet container.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Note 2:</em> Direct calls to one of the <code>GenericServlet.log</code> or <code>ServletContext.log</code> methods are not intercepted and are not filtered by the log level configured for the Web Console.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>level</code> parameter and the <code>loglevel</code> configuration property can be set to any of the constant values defined by the OSGi <code>LogService</code> class:</p> |
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| <td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">LOG_ERROR</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This log entry indicates the bundle or service may not be functional.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">LOG_WARNING</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This log entry indicates a bundle or service is still functioning but may experience problems in the future because of the warning condition.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">LOG_INFO</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This log entry may be the result of any change in the bundle or service and does not indicate a problem.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">LOG_DEBUG</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This log entry is used for problem determination and may be irrelevant to anyone but the bundle developer.</p></td> |
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