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| |
| <div class="section"><h2>Log4j Tag Library<a name="Log4j_Tag_Library"></a></h2> |
| |
| <p>The Log4j Log Tag Library creates the capability of inserting log |
| statements in JSPs without the use of Java scripting. It uses the standard Log4j 2 API to log |
| messages according to your Log4j configuration.</p> |
| |
| <p>This tag library is based on the |
| <a class="externalLink" href="http://jakarta.apache.org/taglibs/log/">Jakarta Commons Log Taglib</a> by Joseph Ottinger and James |
| Strachan. For the most part, logging tags written against Jakarta Commons Log Taglib should |
| work against this library as well. However, the "category" attribute from Jakarta has become |
| the "logger" attribute in this library.</p> |
| |
| </div> |
| |
| <div class="section"><h2>Requirements<a name="Requirements"></a></h2> |
| <p> |
| The Log4j Tag Library requires at least Java 6, at least Servlet 2.5 (or Java EE 5), and at least |
| JSP 2.1 (or Java EE 5). |
| </p> |
| </div> |
| |
| <div class="section"><h2>Usage<a name="Usage"></a></h2> |
| <p>In accordance with the <a href="../log4j-api/apidocs/org/apache/logging/log4j/Logger.html">Logger</a> |
| API, this tag library has tags to |
| support the following logging calls: "catching", "entry", "exit", "log", "trace", "debug", |
| "info", "warn", "error", and "fatal". The "trace" tag was not supported in Jakarta Commons Log |
| Taglib. The "setLogger", "catching", "entry", and "trace" tags are new to this library. This |
| tag library also supports the conditional tag "ifEnabled" (new) and troubleshooting tag "dump" |
| (existed in Jakarta Commons Log Taglib).</p> |
| |
| <p>By default, this tag library uses a different Logger for each JSP named after the JSP ID. |
| You can customize the Logger in any of the logging tags or the "ifEnabled" tag with the |
| "logger" attribute. You can also use the "setLogger" tag to specify the Logger that should apply |
| for the rest of a JSP's execution. If the "setLogger" tag comes before any other logging tags in |
| a JSP, the default Logger for that JSP will not be created, but instead the specified logger is |
| the only one that will be used.</p> |
| |
| <p>Every effort was made to optimize these tags and ensure decent performance, but users of |
| this library should keep in mind that the creation and execution of JSP tags adds significant |
| overhead to the standard Log4j method calls. While the "trace", "debug", and "info" options are |
| available in this library, their uses are not nano-second order of magnitude with logging off |
| that users may be used to with standard Log4j method calls. Therefore, they should be used |
| sparingly. Use of the "ifEnabled" tag does not improve this performance; this tag is available |
| to conditionally evaluate other actions in addition to logging actions.</p> |
| |
| <p>For detailed documentation of each tag, see the <a href="tagreference.html">Tag Library Reference</a> or the |
| <a href="tlddoc/index.html">TLDDoc Documentation</a>.</p> |
| </div> |
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