[
https://issues.apache.org/jira/browse/LOG4J2-1141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14939208#comment-14939208
]
LC commented on LOG4J2-1141:
----------------------------
Here are the relevant {{StatusLogger}} traces from the logs with
{{log4j2-test.xml}} in the subproject and
{{main/src/main/resources/log4j2.xml}} only:
{code}
DEBUG StatusLogger getConfigURI found resource paths [] in servletConext at
[/WEB-INF/]
[...]
TRACE StatusLogger Trying to find [log4j2-test.xml] using context class loader
WebappClassLoader
context: main
delegate: false
INFO: Spring WebApplicationInitializers detected on classpath: [...]
{code}
and with both {{main/src/main/resources/log4j2.xml}} and
{{main/src/main/webapp/WEB-INF/log4j2.xml}}:
{code}
DEBUG StatusLogger getConfigURI found resource paths [/WEB-INF/log4j2.xml] in
servletConext at [/WEB-INF/]
DEBUG StatusLogger getConfigURI found resource
[file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/log4j2.xml]
in servletConext at [/WEB-INF/log4j2.xml]
{code}
(The {{main/src/main/webapp/WEB-INF/log4j2.xml}} only configuration is not a
viable option because of the aforementioned spring-boot issue.)
Removing however {{log4j2-test.xml}} from the subproject and keeping
{{main/src/main/resources/log4j2.xml}} alone results in:
{code}
DEBUG StatusLogger getConfigURI found resource paths [] in servletConext at
[/WEB-INF/]
[...]
TRACE StatusLogger Trying to find [log4j2-test.xml] using context class loader
WebappClassLoader
context: main
delegate: false
[...]
TRACE StatusLogger Trying to find [log4j2.xml] using context class loader
WebappClassLoader
context: main
delegate: false
INFO: Spring WebApplicationInitializers detected on classpath: [...]
{code}
> resources/log4j2.xml is not loaded if a subproject contains another config
> file
> -------------------------------------------------------------------------------
>
> Key: LOG4J2-1141
> URL: https://issues.apache.org/jira/browse/LOG4J2-1141
> Project: Log4j 2
> Issue Type: Bug
> Components: Lookups
> Affects Versions: 2.4
> Environment: Tomcat 8.0.26, Gradle 2.7, Spring Boot 1.2.6, Log4j2 2.4
> (and Eclipse Mars (4.5.0))
> Reporter: LC
>
> {code:title=build.gradle}
> buildscript {
> repositories.mavenCentral()
> dependencies.classpath
> 'org.springframework.boot:spring-boot-gradle-plugin:1.2.6.RELEASE'
> }
> subprojects {
> apply plugin: 'spring-boot'
> apply plugin: 'eclipse-wtp'
> sourceCompatibility = '1.8'
> repositories.mavenCentral()
> dependencies {
> compile 'org.apache.logging.log4j:log4j-api:2.4'
> compile 'org.apache.logging.log4j:log4j-core:2.4'
> compile 'org.apache.logging.log4j:log4j-slf4j-impl:2.4'
> compile 'org.apache.logging.log4j:log4j-web:2.4'
> }
> task wrapper(type: Wrapper) {
> gradleVersion = '2.7'
> }
> eclipse.classpath {
> containers.remove('org.eclipse.jdt.launching.JRE_CONTAINER')
> containers
> 'org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8'
> }
> }
> {code}
> {code:title=settings.gradle}
> include 'child', 'main'
> {code}
> {code:title=main/build.gradle}
> apply plugin: 'war'
> configurations.compile.exclude module : 'spring-boot-starter-logging'
> dependencies {
> compile project(':child')
> compile 'org.springframework.boot:spring-boot-starter-log4j2'
> compile 'org.springframework.boot:spring-boot-starter-web'
> }
> eclipse.wtp.facet.file.withXml { n -> n.asNode().installed.find { it.@facet
> == 'jst.web' }.@version = '3.1' }
> {code}
> {code:title=main/src/main/java/loggertest/Application.java}
> package loggertest;
> import java.net.URI;
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.core.LoggerContext;
> import org.springframework.boot.SpringApplication;
> import org.springframework.boot.autoconfigure.SpringBootApplication;
> import org.springframework.boot.builder.SpringApplicationBuilder;
> import org.springframework.boot.context.embedded.ServletContextInitializer;
> import org.springframework.boot.context.web.SpringBootServletInitializer;
> import org.springframework.context.ApplicationEvent;
> import org.springframework.context.ApplicationListener;
> import org.springframework.web.context.WebApplicationContext;
> @SpringBootApplication
> public class Application {
> public static class Initializer extends SpringBootServletInitializer
> implements ServletContextInitializer {
> @Override
> protected SpringApplicationBuilder configure(final
> SpringApplicationBuilder application) {
> LogManager.getLogger(Application.class).debug("configure()");
> return application.sources(Application.class);
> }
> @Override
> protected WebApplicationContext run(final SpringApplication
> application) {
> application.addListeners(new LoggerContextInfo());
> return super.run(application);
> }
> }
> static class LoggerContextInfo implements
> ApplicationListener<ApplicationEvent> {
> @Override
> public void onApplicationEvent(final ApplicationEvent event) {
> final LoggerContext ctx = LoggerContext.getContext();
> final URI loc = ctx.getConfigLocation();
> System.err.println(String.format("\nevent = %s\nlogCtx.cfg@%X
> = %s\nlogCtx.cfgLoc@%X = %s\n", event.getClass(),
> ctx.getConfiguration().hashCode(),
> ctx.getConfiguration(), (loc != null ? loc.hashCode() : 0), loc));
> }
> }
> public static void main(final String[] args) {
> SpringApplication.run(new Class[] { Application.class,
> Initializer.class }, args);
> }
> }
> {code}
> {code:xml|title=main/src/main/webapp/WEB-INF/web.xml - see issue: LOG4J2-873}
> <?xml version="1.0" encoding="UTF-8"?>
> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
> http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd";
> version="3.1" metadata-complete="false">
> <display-name>dummy</display-name>
> </web-app>
> {code}
> {code:xml|title=main/src/main/resource/log4j2.xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="INFO" strict="true">
> <Appenders>
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout pattern="MY_LOGGER %-5p %d [%t][%c{1}]: %m%n"/>
> </Console>
> </Appenders>
> <Loggers>
> <Logger name="org.springframework" level="WARN"/>
> <Logger name="loggertest" level="DEBUG"/>
> <Root level="DEBUG">
> <AppenderRef ref="Console"/>
> </Root>
> </Loggers>
> </Configuration>
> {code}
> {code:title=child/build.gradle}
> startScripts.enabled = false
> {code}
> {code:xml|title=child/src/main/resources/log4j2-test.xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="INFO" strict="true">
> <Appenders>
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout pattern="CHILD_LOGGER %-5p %d [%t][%c{1}]: %m%n"/>
> </Console>
> </Appenders>
> <Loggers>
> <Logger name="org.springframework" level="WARN"/>
> <Logger name="loggertest" level="DEBUG"/>
> <Root level="DEBUG">
> <AppenderRef ref="Console"/>
> </Root>
> </Loggers>
> </Configuration>
> {code}
> Results with *main/src/main/resources/log4j2.xml*:
> {code}
> event = class org.springframework.boot.context.event.ApplicationStartedEvent
> logCtx.cfg@37E5AA81 =
> XmlConfiguration[location=jar:file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/lib/child.jar!/log4j2-test.xml]
> logCtx.cfgLoc@0 = null
> event = class
> org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent
> logCtx.cfg@B9FC71B =
> XmlConfiguration[location=jar:file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/lib/child.jar!/log4j2-test.xml]
> logCtx.cfgLoc@0 = null
> {code}
> Moving log4j2.xml from resources to *main/src/main/webapp/WEB-INF* will let
> log4j2 initialize with the correct config file, however thanks to another
> [issue in
> spring-boot|https://github.com/spring-projects/spring-boot/issues/4055] this
> will be overwritten (note how the configLocation field would still point to
> the original file):
> {code}
> event = class org.springframework.boot.context.event.ApplicationStartedEvent
> logCtx.cfg@5F77D5DB =
> XmlConfiguration[location=[...]\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\main\WEB-INF\log4j2.xml]
> logCtx.cfgLoc@E93E026A =
> file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/log4j2.xml
> event = class
> org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent
> logCtx.cfg@F8561F3 =
> XmlConfiguration[location=jar:file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/lib/spring-boot-1.2.6.RELEASE.jar!/org/springframework/boot/logging/log4j2/log4j2.xml]
> logCtx.cfgLoc@E93E026A =
> file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/log4j2.xml
> {code}
> Duplication the config file in *main/src/main/resources/log4j2.xml* and
> *main/src/main/webapp/WEB-INF* "solves" the issue -- if you consider code
> duplication a solution. (The new config object is the result of the
> aforementioned spring-boot bug.)
> {code}
> event = class org.springframework.boot.context.event.ApplicationStartedEvent
> logCtx.cfg@35DFF1ED =
> XmlConfiguration[location=[...]\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\main\WEB-INF\log4j2.xml]
> logCtx.cfgLoc@E93E026A =
> file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/log4j2.xml
> event = class
> org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent
> logCtx.cfg@59A0B4D =
> XmlConfiguration[location=[...]\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\main\WEB-INF\log4j2.xml]
> logCtx.cfgLoc@E93E026A =
> file:/[...]/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/main/WEB-INF/log4j2.xml
> {code}
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