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| <div class="section"> |
| <h2><a name="Tag_reference_sheet"></a>Tag reference sheet</h2> |
| <p>Tag library reference for the following tag libraries:</p> |
| <ul> |
| <li><a href="#log.tld">Log4j 2 Tag Library (log.tld)</a> - uri:http://logging.apache.org/log4j/tld/log</li></ul></div><a name="log.tld"></a> |
| <div class="section"> |
| <h2><a name="Log4j_2_Tag_Library_-_version_1.0"></a>Log4j 2 Tag Library - version 1.0</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. You can learn more about Log4j 2 on the |
| <a href="http://logging.apache.org/log4j/2.x/">Log4j 2</a> website. |
| |
| This tag library is based on the Jakarta Commons Log Taglib 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. |
| |
| In accordance with the org.apache.logging.log4j.Logger 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). |
| |
| 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. |
| |
| 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 nanosecond 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><b>Namespace definition:</b> xmlns:log="http://logging.apache.org/log4j/tld/log"</p> |
| <p><b>Tags</b></p> |
| <ul> |
| <li><a href="#log:catching">catching</a> Equivalent of org</li> |
| <li><a href="#log:debug">debug</a> Equivalent of org</li> |
| <li><a href="#log:dump">dump</a> Displays all variables bound to the specified scope</li> |
| <li><a href="#log:entry">entry</a> Equivalent of org</li> |
| <li><a href="#log:error">error</a> Equivalent of org</li> |
| <li><a href="#log:exit">exit</a> Equivalent of org</li> |
| <li><a href="#log:fatal">fatal</a> Equivalent of org</li> |
| <li><a href="#log:ifEnabled">ifEnabled</a> Conditional tag that evaluates its body only if the specified log level and |
| marker are enabled</li> |
| <li><a href="#log:info">info</a> Equivalent of org</li> |
| <li><a href="#log:log">log</a> Equivalent of org</li> |
| <li><a href="#log:setLogger">setLogger</a> Sets the default Logger to use for the rest of this JSP's execution OR exports |
| an org</li> |
| <li><a href="#log:trace">trace</a> Equivalent of org</li> |
| <li><a href="#log:warn">warn</a> Equivalent of org</li></ul> |
| <p>Required attributes are marked with a<b>*</b></p><a name="log:catching"></a> |
| <div class="section"> |
| <h3><a name="alog:catching"></a><log:catching></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#catching().</p> |
| <p>Can contain:empty</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <c:catch var="myException"> |
| <%= 5 / 0 %> |
| </c:catch> |
| <c:if test="${myException != null}"> |
| <log:catching exception="${myException}" /> |
| </c:if> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td><b>exception*</b></td> |
| <td>The exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>level</td> |
| <td>The name of any valid level (TRACE, DEBUG, INFO, etc.) or an actual Level |
| instance to log this at. This value is case-insensitive and defaults to ERROR for this |
| tag.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr></table></div></div><a name="log:debug"></a> |
| <div class="section"> |
| <h3><a name="alog:debug"></a><log:debug></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#debug(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:debug message="Log this message." /> |
| <log:debug logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:debug logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:debug> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></div></div><a name="log:dump"></a> |
| <div class="section"> |
| <h3><a name="alog:dump"></a><log:dump></h3> |
| <p>Displays all variables bound to the specified scope.</p> |
| <p>Can contain:empty</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:dump scope="page" /> |
| <log:dump scope="request" /> |
| <log:dump scope="session" /> |
| <log:dump scope="application" /> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td><b>scope*</b></td> |
| <td>Either "page," "request," "session," or "application," the scope whose bound |
| variables should be dumped onto the page inline.</td> |
| <td>String</td></tr></table></div></div><a name="log:entry"></a> |
| <div class="section"> |
| <h3><a name="alog:entry"></a><log:entry></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#entry(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values |
| will be logged with this entry (TRACE) statement. The attribute names will be |
| ignored.</p> |
| <p>Can contain:empty</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:entry /> |
| <log:entry logger="com.foo.bar" /> |
| <log:entry arg1="${value1}" arg2="${value2}" /> |
| <log:entry logger="${myLogger}" argA="${value1}" argB="${value2}" /> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr></table></div></div><a name="log:error"></a> |
| <div class="section"> |
| <h3><a name="alog:error"></a><log:error></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#error(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:error message="Log this message." /> |
| <log:error logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:error logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:error> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="b"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></div></div><a name="log:exit"></a> |
| <div class="section"> |
| <h3><a name="alog:exit"></a><log:exit></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#exit().</p> |
| <p>Can contain:empty</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:exit /> |
| <log:exit logger="com.foo.bar" /> |
| <log:exit result="${value}" /> |
| <log:exit logger="${myLogger}" result="${value}" /> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>result</td> |
| <td>An optional object to log with the exit (TRACE) statement.</td> |
| <td>String</td></tr></table></div></div><a name="log:fatal"></a> |
| <div class="section"> |
| <h3><a name="alog:fatal"></a><log:fatal></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#fatal(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:fatal message="Log this message." /> |
| <log:fatal logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:fatal logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:fatal> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="b"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></div></div><a name="log:ifEnabled"></a> |
| <div class="section"> |
| <h3><a name="alog:ifEnabled"></a><log:ifEnabled></h3> |
| <p>Conditional tag that evaluates its body only if the specified log level and |
| marker are enabled.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:ifEnabled level="info"> |
| Evaluate this content |
| </log:ifEnabled> |
| |
| <log:ifEnabled logger="com.foo.bar" level="INFO" marker="${marker}"> |
| Evaluate this content |
| </log:ifEnabled> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td><b>level*</b></td> |
| <td>The name of any valid Level (TRACE, DEBUG, INFO, etc.) or an actual Level |
| instance to check whether it is enabled. This value is case-insensitive.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Marker data to include in the enabled check.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr></table></div></div><a name="log:info"></a> |
| <div class="section"> |
| <h3><a name="alog:info"></a><log:info></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#info(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:info message="Log this message." /> |
| <log:info logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:info logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:info> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></div></div><a name="log:log"></a> |
| <div class="section"> |
| <h3><a name="alog:log"></a><log:log></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#log(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:log level="warn" message="Log this message." /> |
| <log:log logger="com.foo.bar" level="ERROR" message="${objectToLog}" |
| exception="${exception}" marker="${marker}" /> |
| <log:log logger="com.foo.bar" level="info" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:log> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td><b>level*</b></td> |
| <td>The name of any valid level (TRACE, DEBUG, INFO, etc.) or an actual Level |
| instance to log this at. This value is case-insensitive.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></div></div><a name="log:setLogger"></a> |
| <div class="section"> |
| <h3><a name="alog:setLogger"></a><log:setLogger></h3> |
| <p>Sets the default Logger to use for the rest of this JSP's execution OR exports |
| an org.apache.logging.log4j.Logger instance as the specified EL variable. The "value" |
| attribute specifies either the String name of a Logger to create or an actual Logger instance. |
| By default, Loggers are constructed and assigned the standard |
| org.apache.logging.log4j.message.ParameterizedMessageFactory. The optional "factory" attribute |
| can be used to override the default message factory.</p> |
| <p>Can contain:empty</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:logger value="com.foo.bar" /> |
| <log:logger value="com.bar.foo" var="myLogger" /> |
| <log:debug message="This should log with com.foo.bar." /> |
| <log:debug logger="${myLogger}" message="This should log with com.bar.foo." /> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>factory</td> |
| <td>Specify this optional tag to provide a message factory other than the default |
| ParameterizedMessageFactory message factory to use for the Logger. If the Logger has already |
| been created with a different message factory, this will be ignored. Using this attribute |
| makes no sense if the "value" attribute's value is an actual Logger instance, since its |
| message factory cannot be changed.</td> |
| <td>org.apache.logging.log4j.message.MessageFactory</td></tr> |
| <tr class="b"> |
| <td><b>logger*</b></td> |
| <td>The name or instance of the Logger to set as the JSP's default Logger or |
| the name of the Logger to export as the specified EL variable.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>scope</td> |
| <td>Either "page," "request," "session," or "application," the optional scope that |
| the EL variable should be exported to (defaults to "page").</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>var</td> |
| <td>The optional name of the EL variable to export this Logger as. Using this |
| attribute makes no sense if the "value" attribute's value is an actual Logger instance. |
| That would result in an existing Logger on the scope being re-added to the |
| scope.</td> |
| <td>String</td></tr></table></div></div><a name="log:trace"></a> |
| <div class="section"> |
| <h3><a name="alog:trace"></a><log:trace></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#trace(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:trace message="Log this message." /> |
| <log:trace logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:trace logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:trace> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></div></div><a name="log:warn"></a> |
| <div class="section"> |
| <h3><a name="alog:warn"></a><log:warn></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#warn(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p> |
| <div class="section"> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"> |
| <pre> |
| <log:warn message="Log this message." /> |
| <log:warn logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:warn logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:warn> |
| </pre></div></div> |
| <div class="section"> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="bodyTable"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="b"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></div></div></div><!-- PB --> |
| </td> |
| </tr> |
| </table> |
| </div> |
| |
| <div class="footer"> |
| <p>Copyright © 1999-2019 <a class="external" href="https://www.apache.org/">The Apache Software Foundation</a>. All Rights Reserved.</p> |
| <p>Apache Logging, Apache Log4j, Log4j, Apache, the Apache feather logo, and the Apache Logging project logo are trademarks of The Apache Software Foundation.</p> |
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