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| <h1>Log4j Spring Boot Support</h1> |
| <p>This module provides enhanced support for Spring Boot beyond what Spring Boot itself provides.</p><section> |
| <h2><a name="Overview"></a>Overview</h2> |
| <p>The components in this module require a Spring Environment to have been created. Spring Boot |
| applications initialize logging multiple times. The first initialization occurs before |
| any initialization work is performed by Spring, thus no Environment will have been created |
| and the components implemented in this module will not produce the desired results. Subsequent |
| initializations of logging will have a Spring Environment.</p></section><section> |
| <h2><a name="Usage"></a>Usage</h2><section> |
| <h3><a name="Spring_Lookup"></a>Spring Lookup</h3> |
| <p>The Spring Lookup allows configuration files to reference properties defined in Spring |
| configuration files from a Log4j configuration file. For example:</p> |
| |
| <div class="source"><pre class="prettyprint"><code><property name="applicationName">${spring:spring.application.name}</property> |
| </code></pre></div> |
| <p>would set the Log4j applicationName property to the value of spring.application.name set in the |
| Spring configuration.</p></section><section> |
| <h3><a name="Spring_Property_Source"></a>Spring Property Source</h3> |
| <p>Log4j uses property sources when resolving properties it uses internally. This support allows |
| most of Log4j's <a href="manual/configuration.html#SystemProperties">System Properties</a> |
| to be specified in the Spring Configuration. However, some properties that are only referenced |
| during the first Log4j initialization, such as the property Log4j uses to allow the default |
| Log4j implementation to be chosen, would not be available.</p></section><section> |
| <h3><a name="Spring_Profile_Arbiter"></a>Spring Profile Arbiter</h3> |
| <p>New with Log4j 2.15.0 are “Arbiters” which are conditionals that can cause a portion of the Log4j configuration to |
| be included or excluded. log4j-spring-boot provides an Arbiter that allows a Spring profile value to be used for |
| this purpose. Below is an example:</p> |
| |
| <div class="source"><pre class="prettyprint"><code><Configuration name="ConfigTest" status="ERROR" monitorInterval="5"> |
| <Appenders> |
| |
| <SpringProfile name="dev | staging"> |
| <Console name="Out"> |
| <PatternLayout pattern="%m%n"/> |
| </Console> |
| </SpringProfile> |
| <SpringProfile name="prod"> |
| <List name="Out"> |
| </List> |
| </SpringProfile> |
| |
| </Appenders> |
| <Loggers> |
| <Logger name="org.apache.test" level="trace" additivity="false"> |
| <AppenderRef ref="Out"/> |
| </Logger> |
| <Root level="error"> |
| <AppenderRef ref="Out"/> |
| </Root> |
| </Loggers> |
| </Configuration> |
| </code></pre></div></section></section><section> |
| <h2><a name="Requirements"></a>Requirements</h2> |
| <p>The Log4j 2 Spring Cloud Configuration integration has a dependency on Log4j 2 API, Log4j 2 Core, and |
| Spring Boot versions 2.0.3.RELEASE or 2.1.1.RELEASE or later versions it either release series. |
| For more information, see <a href="runtime-dependencies.html">Runtime Dependencies</a>.</p></section> |
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