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When a custom management.port is used, the child context is configured with an EmbeddedServletContainerFactory bean that has the same class as the parent context’s EmbeddedServletContainerFactory bean. This ensures that the child context uses the same type of embedded container as its parent when there are multiple embedded containers on the classpath. It also causes a failure when the custom EmbeddedServletContainerFactory subclass cannot be instantiated, for example because it’s an anonymous inner-class. This commit improves the diagnostics so that we fail fast with an information exception message when we detect that the embedded servlet container factory bean’s class cannot be instantiated. Closes gh-6193 |
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README.adoc |
= Spring Boot - Actuator Spring Boot Actuator includes a number of additional features to help you monitor and manage your application when it's pushed to production. You can choose to manage and monitor your application using HTTP endpoints, with JMX or even by remote shell (SSH or Telnet). Auditing, health and metrics gathering can be automatically applied to your application. The http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#production-ready[user guide] covers the features in more detail. == Enabling the Actuator The simplest way to enable the features is to add a dependency to the `spring-boot-starter-actuator` "`Starter POM`". To add the actuator to a Maven based project, add the following "`starter`" dependency: [source,xml,indent=0] ---- <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> </dependencies> ---- For Gradle, use the declaration: [indent=0] ---- dependencies { compile("org.springframework.boot:spring-boot-starter-actuator") } ---- == Features * **Endpoints** Actuator endpoints allow you to monitor and interact with your application. Spring Boot includes a number of built-in endpoints and you can also add your own. For example the `health` endpoint provides basic application health information. Run up a basic application and look at `/health` (and see `/mappings` for a list of other HTTP endpoints). * **Metrics** Spring Boot Actuator includes a metrics service with "`gauge`" and "`counter`" support. A "`gauge`" records a single value; and a "`counter`" records a delta (an increment or decrement). Metrics for all HTTP requests are automatically recorded, so if you hit the `metrics` endpoint should see a sensible response. * **Audit** Spring Boot Actuator has a flexible audit framework that will publish events to an `AuditService`. Once Spring Security is in play it automatically publishes authentication events by default. This can be very useful for reporting, and also to implement a lock-out policy based on authentication failures. * **Process Monitoring** In Spring Boot Actuator you can find `ApplicationPidFileWriter` which creates a file containing the application PID (by default in the application directory with a file name of `application.pid`).