Spring Boot Startup Report

Spring Boot Startup Report library generates an interactive Spring Boot application startup report that lets you understand what contributes to the application startup time and perhaps helps to optimize it.

🤩 Highlights

• startup report available in runtime as an interactive HTML page
• generating startup reports in integration tests
• flame chart
• search by class or an annotation

Report table lets you dig into the details of beans instantiation:

Flame graphs is a more visual representation of the data from the table:

⚠️ Minimum Requirements

To use the library your project must use following versions

• Java 8
• Spring Boot 2.7+, 3.0+

✨ How to use

<dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
 </dependency>

1. Add the dependency to spring-boot-startup-report:

<dependency>
    <groupId>com.maciejwalkowiak.spring</groupId>
    <artifactId>spring-boot-startup-report</artifactId>
    <version>0.2.0</version>
    <optional>true</optional>
</dependency>

2. Run application.

3. Assuming application runs on port 8080, go to http://localhost:8080/startup-report

Using with integration tests

When library is on the classpath, it also automatically generates startup reports for each application context started during running integration tests (tests annotated with @SpringBootTest). You'll find them in target/startup-reports for Maven projects and in build/startup-reports for Gradle.

For integration tests that do not use @SpringBootTest but @WebMvcTest, @DataJpaTest or any other test slice, add @Import(StartupEventsAutoConfiguration.class) on the top of the test class to enable generating report.

@Import(StartupEventsAutoConfiguration.class)
@WebMvcTest(OwnerController.class)
public class OwnerControllerTests {
    ...
}

If you need only to generate reports for tests, but do not need to have the report available in runtime under an endpoint, you can declare the dependency with a test scope:

<dependency>
    <groupId>com.maciejwalkowiak.spring</groupId>
    <artifactId>spring-boot-startup-report</artifactId>
    <version>0.2.0</version>
    <scope>test</scope>
</dependency>

Sounds good? Consider ❤️ Sponsoring the project! Thank you!