https://jira.baeldung.com/browse/BAEL-8843

spring-boot-modules/pom.xml

@@ -103,6 +103,7 @@
         <module>spring-boot-3-test-pitfalls</module>
         <module>spring-boot-3-testcontainers</module>
         <module>spring-boot-3-2</module>
+        <module>spring-boot-3-4</module>
         <module>spring-boot-resilience4j</module>
         <module>spring-boot-properties</module>
         <module>spring-boot-properties-2</module>

spring-boot-modules/spring-boot-3-4/README.md

@@ -0,0 +1 @@
+## Relevant Articles

spring-boot-modules/spring-boot-3-4/log.json

@@ -0,0 +1,69 @@
+{
+  "@timestamp": "2024-12-19T10:34:02.220152180Z",
+  "log.level": "INFO",
+  "process.pid": 34696,
+  "process.thread.name": "main",
+  "service.name": "BaeldungService",
+  "service.version": "1",
+  "service.environment": "Production",
+  "service.node.name": "Primary",
+  "log.logger": "com.baeldung.springstructuredlogging.StructuredLoggingApp",
+  "message": "Starting StructuredLoggingApp using Java 23 with PID 34696 (\/home\/michael\/tutorials\/spring-boot-modules\/spring-boot-3-4\/target\/classes started by michael in \/home\/michael\/tutorials\/spring-boot-modules\/spring-boot-3-4)",
+  "ecs.version": "8.11"
+}
+{
+  "@timestamp": "2024-12-19T10:34:02.240898973Z",
+  "log.level": "INFO",
+  "process.pid": 34696,
+  "process.thread.name": "main",
+  "service.name": "BaeldungService",
+  "service.version": "1",
+  "service.environment": "Production",
+  "service.node.name": "Primary",
+  "log.logger": "com.baeldung.springstructuredlogging.StructuredLoggingApp",
+  "message": "No active profile set, falling back to 1 default profile: \"default\"",
+  "ecs.version": "8.11"
+}
+{
+  "@timestamp": "2024-12-19T10:34:03.558243665Z",
+  "log.level": "INFO",
+  "process.pid": 34696,
+  "process.thread.name": "main",
+  "service.name": "BaeldungService",
+  "service.version": "1",
+  "service.environment": "Production",
+  "service.node.name": "Primary",
+  "log.logger": "com.baeldung.springstructuredlogging.StructuredLoggingApp",
+  "message": "Started StructuredLoggingApp in 2.777 seconds (process running for 4.356)",
+  "ecs.version": "8.11"
+}
+{
+  "@timestamp": "2024-12-19T10:34:03.564752429Z",
+  "log.level": "INFO",
+  "process.pid": 34696,
+  "process.thread.name": "main",
+  "service.name": "BaeldungService",
+  "service.version": "1",
+  "service.environment": "Production",
+  "service.node.name": "Primary",
+  "log.logger": "com.baeldung.springstructuredlogging.CustomLog",
+  "message": "Hello structured logging!",
+  "userName": "Baeldung",
+  "userId": "1",
+  "ecs.version": "8.11"
+}
+{
+  "@timestamp": "2024-12-19T10:34:03.568047793Z",
+  "log.level": "INFO",
+  "process.pid": 34696,
+  "process.thread.name": "main",
+  "service.name": "BaeldungService",
+  "service.version": "1",
+  "service.environment": "Production",
+  "service.node.name": "Primary",
+  "log.logger": "com.baeldung.springstructuredlogging.CustomLog",
+  "message": "Hello Structure logging!",
+  "userId": "1",
+  "userName": "Baeldung",
+  "ecs.version": "8.11"
+}

spring-boot-modules/spring-boot-3-4/pom.xml

@@ -0,0 +1,27 @@
+<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.spring-boot-3-4</groupId>
+    <artifactId>spring-boot-3-4</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <name>spring-boot-3-4</name>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+            <version>${spring-boot.version}</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+    <properties>
+        <spring-boot.version>3.4.0</spring-boot.version>
+    </properties>
+</project>

spring-boot-modules/spring-boot-3-4/src/main/java/com/baeldung/springstructuredlogging/CustomLog.java

@@ -0,0 +1,34 @@
+package com.baeldung.springstructuredlogging;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.slf4j.MDC;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CustomLog implements CommandLineRunner {
+    private static final Logger LOGGER = LoggerFactory.getLogger(CustomLog.class);
+
+    public void additionalDetailsWithMdc() {
+        MDC.put("userId", "1");
+        MDC.put("userName", "Baeldung");
+        LOGGER.info("Hello structured logging!");
+        MDC.remove("userId");
+        MDC.remove("userName");
+    }
+
+    public void additionalDetailsUsingFluentApi() {
+        LOGGER.atInfo()
+            .setMessage("Hello Structure logging!")
+            .addKeyValue("userId", "1")
+            .addKeyValue("userName", "Baeldung")
+            .log();
+    }
+
+    @Override
+    public void run(String... args) {
+        additionalDetailsWithMdc();
+        additionalDetailsUsingFluentApi();
+    }
+}

spring-boot-modules/spring-boot-3-4/src/main/java/com/baeldung/springstructuredlogging/MyStructuredLoggingFormatter.java

@@ -0,0 +1,28 @@
+package com.baeldung.springstructuredlogging;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import org.springframework.boot.json.JsonWriter;
+import org.springframework.boot.logging.structured.StructuredLogFormatter;
+
+public class MyStructuredLoggingFormatter implements StructuredLogFormatter<ILoggingEvent> {
+
+    private final JsonWriter<ILoggingEvent> writer = JsonWriter.<ILoggingEvent>of((members) -> {
+        members.add("time", ILoggingEvent::getInstant);
+        members.add("level", ILoggingEvent::getLevel);
+        members.add("thread", ILoggingEvent::getThreadName);
+        members.add("message", ILoggingEvent::getFormattedMessage);
+        members.add("application").usingMembers((application) -> {
+            application.add("name", "StructuredLoggingDemo");
+            application.add("version", "1.0.0-SNAPSHOT");
+        });
+        members.add("node").usingMembers((node) -> {
+            node.add("hostname", "node-1");
+            node.add("ip", "10.0.0.7");
+        });
+    }).withNewLineAtEnd();
+
+    @Override
+    public String format(ILoggingEvent event) {
+        return this.writer.writeToString(event);
+    }
+}

spring-boot-modules/spring-boot-3-4/src/main/java/com/baeldung/springstructuredlogging/StructuredLoggingApp.java

@@ -0,0 +1,13 @@
+package com.baeldung.springstructuredlogging;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class StructuredLoggingApp {
+
+    public static void main(String[] args) {
+        SpringApplication.run(StructuredLoggingApp.class, args);
+    }
+
+}

spring-boot-modules/spring-boot-3-4/src/main/resources/application.properties

@@ -0,0 +1,6 @@
+logging.structured.format.file=ecs
+logging.file.name=log.json
+logging.structured.ecs.service.name=BaeldungService
+logging.structured.ecs.service.version=1
+logging.structured.ecs.service.environment=Production
+logging.structured.ecs.service.node-name=Primary