Debugging and troubleshooting Spring Boot application

Debugging and troubleshooting are essential activities in software development, and Spring Boot provides several tools to help you with these tasks.

Here are some common techniques for debugging and troubleshooting Spring Boot applications:

1. Debugging using logs: Spring Boot uses the Logback library to log messages from your application. You can configure the logging levels for various packages and components to get more or less information in your logs. For example, to increase the logging level for the org.springframework package to debug in the application.properties file:

2. Debugging with a debugger: You can use a debugger to step through your code and inspect the state of your application as it runs. To attach a debugger to a Spring Boot application, you need to set the debug argument in the run command of your build tool, such as Maven or Gradle, or in the command line when starting the application:

3. Debugging using Live Reload: Spring Boot supports Live Reload, which allows you to modify your code and see the changes reflected immediately without having to restart the application. To enable Live Reload, you need to add the spring-boot-devtools module to your application, either as a dependency in your build file or as a JAR on the classpath.

4. Troubleshooting with Actuator: Spring Boot Actuator provides a wealth of information about the state of your application, such as health checks, metrics, and more. You can access this information through the Actuator endpoints, which are available at /actuator/ by default. For example, to see the current state of the health of your application, you can access the /actuator/health endpoint.

By using these techniques and tools, you can effectively debug and troubleshoot your Spring Boot applications, making it easier to identify and resolve issues and improve the quality of your code.