BAEL-1783 (#4545)

* BAEL-1783

* tabs to spaces, artifact id renamed

* tabs to spaces

* Added module spring-boot-logging-log4j2

* Removed <name> node

* @GetMapping instead of the older @RequestMapping

* @GetMapping instead of the older @RequestMapping

pom.xml

@@ -147,6 +147,7 @@
         <module>spring-boot-ops</module>
         <module>spring-boot-security</module>
         <module>spring-boot-mvc</module>
+        <module>spring-boot-logging-log4j2</module>	    
         <module>spring-cloud-data-flow</module>
         <module>spring-cloud</module>
         <module>spring-core</module>

spring-boot-logging-log4j2/.gitignore

@@ -0,0 +1,29 @@
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/build/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/logs/
+/bin/
+/mvnw
+/mvnw.cmd

spring-boot-logging-log4j2/pom.xml

@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.baeldung</groupId>
+    <artifactId>spring-boot-logging-log4j2</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <description>Demo project for Spring Boot Logging with Log4J2</description>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.3.RELEASE</version>
+        <relativePath /> <!-- lookup parent from repository -->
+    </parent>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-starter-logging</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-log4j2</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

spring-boot-logging-log4j2/src/main/java/com/baeldung/springbootlogging/LoggingController.java

@@ -0,0 +1,37 @@
+package com.baeldung.springbootlogging;
+
+import org.apache.logging.log4j.LogManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class LoggingController {
+
+    private final static Logger logger = LoggerFactory.getLogger(LoggingController.class);
+
+    @GetMapping("/")
+    public String index() {
+        logger.trace("A TRACE Message");
+        logger.debug("A DEBUG Message");
+        logger.info("An INFO Message");
+        logger.warn("A WARN Message");
+        logger.error("An ERROR Message");
+
+        return "Howdy! Check out the Logs to see the output...";
+    }
+
+    private static final org.apache.logging.log4j.Logger loggerNative = LogManager.getLogger(LoggingController.class);
+
+    @GetMapping("/native")
+    public String nativeLogging() {
+        loggerNative.trace("This TRACE message has been printed by Log4j2 without passing through SLF4J");
+        loggerNative.debug("This DEBUG message has been printed by Log4j2 without passing through SLF4J");
+        loggerNative.info("This INFO message has been printed by Log4j2 without passing through SLF4J");
+        loggerNative.warn("This WARN message been printed by Log4j2 without passing through SLF4J");
+        loggerNative.error("This ERROR message been printed by Log4j2 without passing through SLF4J");
+        loggerNative.fatal("This FATAL message been printed by Log4j2 without passing through SLF4J");
+        return "Howdy! Check out the Logs to see the output printed directly throguh Log4j2...";
+    }
+}

spring-boot-logging-log4j2/src/main/java/com/baeldung/springbootlogging/SpringBootLoggingApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.springbootlogging;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringBootLoggingApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringBootLoggingApplication.class, args);
+    }
+}

spring-boot-logging-log4j2/src/main/resources/log4j2-spring.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration>
+
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout
+                pattern="%style{%d{ISO8601}}{black} %highlight{%-5level }[%style{%t}{bright,blue}] %style{%C{1.}}{bright,yellow}: %msg%n%throwable" />
+        </Console>
+
+        <RollingFile name="RollingFile"
+            fileName="./logs/spring-boot-logger-log4j2.log"
+            filePattern="./logs/$${date:yyyy-MM}/spring-boot-logger-log4j2-%d{-dd-MMMM-yyyy}-%i.log.gz">
+            <PatternLayout>
+                <pattern>%d %p %C{1.} [%t] %m%n</pattern>
+            </PatternLayout>
+            <Policies>
+                <!-- rollover on startup, daily and when the file reaches 
+                    10 MegaBytes -->
+                <OnStartupTriggeringPolicy />
+                <SizeBasedTriggeringPolicy
+                    size="10 MB" />
+                <TimeBasedTriggeringPolicy />
+            </Policies>
+        </RollingFile>
+    </Appenders>
+
+    <Loggers>
+        <!-- LOG everything at INFO level -->
+        <Root level="info">
+            <AppenderRef ref="Console" />
+            <AppenderRef ref="RollingFile" />
+        </Root>
+
+        <!-- LOG "com.baeldung*" at TRACE level -->
+        <Logger name="com.baeldung" level="trace"></Logger>
+    </Loggers>
+
+</Configuration>

spring-boot-mvc/src/main/java/com/baeldung/springbootmvc/LoggingController.java

@@ -0,0 +1,23 @@
+package com.baeldung.springbootmvc;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class LoggingController {
+
+    Logger logger = LoggerFactory.getLogger(LoggingController.class);
+
+    @GetMapping("/")
+    public String index() {
+        logger.trace("A TRACE Message");
+        logger.debug("A DEBUG Message");
+        logger.info("An INFO Message");
+        logger.warn("A WARN Message");
+        logger.error("An ERROR Message");
+
+        return "Howdy! Check out the Logs to see the output...";
+    }
+}