Spring Boot's Actuator is a great tool for monitoring and managing your Spring Boot application. In this post, we'll take a look at how to use Actuator to monitor your application's health and performance.
Actuator is a Spring Boot module that provides production-ready features to help you monitor and manage your application. With Actuator, you can monitor your application's health, performance, and even create custom endpoint to get information about your application's state.
To use Actuator in your Spring Boot application, you need to add the following dependency to your pom.xml
:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
Once you've added the dependency, you can start using Actuator's features.
One of the most important features of Actuator is its ability to monitor your application's health. By default, Actuator exposes a /health
endpoint that you can use to check your application's health.
The /health
endpoint returns a status
property that can have one of the following values:
UP
: The application is up and running.DOWN
: The application is down.OUT_OF_SERVICE
: The application is out of service.The /health
endpoint also returns a details
property that contains more information about the application's health. For example, the details
property might contain information about the application's database connection or the number of threads that are currently running.
In addition to the /health
endpoint, Actuator also exposes a /info
endpoint that you can use to get information about your application. The /info
endpoint returns a build
property that contains information about the application's build, such as the version number and the timestamp of the build.
In addition to monitoring your application's health, Actuator can also help you monitor your application's performance. Actuator exposes a number of performance-related endpoint, such as /metrics
, /dump
, and /trace
.
The /metrics
endpoint returns a number of performance-related metrics, such as the number of requests that have been processed, the average response time, and the number of errors that have occurred.
The /dump
endpoint returns a thread dump of the application, which can be useful for debugging purposes.
The /trace
endpoint returns a trace of the application, which can be useful for understanding the application's flow.
In addition to the built-in endpoint, Actuator also allows you to create custom endpoint. To create a custom endpoint, you need to create a class that implements the Endpoint
interface.
For example, the following class creates a custom /myendpoint
endpoint that returns a message
property:
@Component
public class MyEndpoint implements Endpoint<Map<String, String>> {
@Override
public String getId() {
return "/myendpoint";
}
@Override
public Map<String, String> invoke() {
Map<String, String> result = new HashMap<>();
result.put("message", "Hello, world!");
return result;
}
@Override
public boolean isSensitive() {
return false;
}
}
##Conclusion
In this post, we've looked at how to use Spring Boot's Actuator for monitoring your application. Actuator is a great tool for monitoring your application's health and performance. In addition, Actuator allows you to create custom endpoint to get information about your application.