How to integrate JavaMelody with Spring Boot 2

Tutorial describing how to integrate JavaMelody with Spring Boot 2 application to monitor application health.

Please note that this configuration isn’t compatible with Spring Boot 1 nor plain Spring project. For those project we cannot use the javamelody-spring-boot-starter library with preconfigured JavaMelody beans but should use the javamelody-core dependency and do the configuration ourself like desbribed here.

Technologies used:

Spring Boot 2.2.1.RELEASE
JDK 1.8
Maven 3
JavaMelody

Project setup

Project dependencies managed by the Maven’s pom.xml configuration file:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/>
    </parent>

    <groupId>com.devcases.springboot</groupId>
    <artifactId>springboot-javamelody</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>net.bull.javamelody</groupId>
            <artifactId>javamelody-spring-boot-starter</artifactId>
            <version>1.80.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

The explanation of above dependencies:

spring-boot-starter-web – packages all the necessary dependencies together with the auto configuration for running simple web application
javamelody-spring-boot-starter – provides auto configuration for JavaMelody
spring-boot-maven-plugin – plugin prividing commands to work with a Spring Boot application (we will be usine the spring-boot:run command)

Application Initializer

@SpringBootApplication
public class Application extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

We don’t have to configure anything for enabling JavaMelody. The javamelody-spring-boot-starter does all the job.

Controller

@RestController
public class HelloWorldController {

    @GetMapping("/hello")
    public String hello() {
        return "Hello World";
    }
}

Running

The project can be started by the running the following command:

mvn clean spring-boot:run

By visiting the localhost:8080/hellourl, we should see the page with “Hello World” text.

By visiting the localhost:8080/monitoringurl, we can see JavaMelody reports.

The example code you can download from here