Application fails to start with excluded health endpoint when JMX is enabled

[ThomasVitale]

Starting from Spring Boot 2.6.0-M2, the Spring Boot Actuator fails during the application startup when the health endpoint is not included in the management.endpoints.web.exposure.include property. It looks like that scenario triggers Actuator to use the new functionality added in #25471 for supporting additional health endpoint paths, even if no configuration has been provided for that.

It's probably not that common to use Actuator without leveraging the useful health endpoint, but if that happens, it's a breaking issue when upgrading to Spring Boot 2.6.0+ (the error is not present in 2.5.5).

I made a small demo application you can run and see more details in the logs about the error thrown during the startup. https://github.com/ThomasVitale/spring-boot-additonal-health-group

An extract of the error message:

Error creating bean with name 'healthEndpointWebMvcHandlerMapping' defined in class path resource [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointWebExtensionConfiguration$MvcAdditionalHealthEndpointPathsConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.web.servlet.AdditionalHealthEndpointPathsWebMvcHandlerMapping]: Factory method 'healthEndpointWebMvcHandlerMapping' threw exception; nested exception is java.util.NoSuchElementException: No value present

[mbhave]

@ThomasVitale I was not able to reproduce the behavior with the provided sample. However, if I add spring.jmx.enabled; true to application.yml, I see the error you've described. Could you confirm if that's what you're seeing as well?

[ThomasVitale]

@mbhave When I run the app I referenced, I get the following error message at startup. If I don't provide any Actuator configuration at all, then the application starts up correctly (even if spring.jmx.enabled is set to true).

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'healthEndpointWebMvcHandlerMapping' defined in class path resource [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointWebExtensionConfiguration$MvcAdditionalHealthEndpointPathsConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.web.servlet.AdditionalHealthEndpointPathsWebMvcHandlerMapping]: Factory method 'healthEndpointWebMvcHandlerMapping' threw exception; nested exception is java.util.NoSuchElementException: No value present
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.10.jar:5.3.10]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.10.jar:5.3.10]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.0-M3.jar:2.6.0-M3]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:719) ~[spring-boot-2.6.0-M3.jar:2.6.0-M3]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:401) ~[spring-boot-2.6.0-M3.jar:2.6.0-M3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) ~[spring-boot-2.6.0-M3.jar:2.6.0-M3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290) ~[spring-boot-2.6.0-M3.jar:2.6.0-M3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1279) ~[spring-boot-2.6.0-M3.jar:2.6.0-M3]
	at com.example.demo.DemoApplication.main(DemoApplication.java:12) ~[main/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.web.servlet.AdditionalHealthEndpointPathsWebMvcHandlerMapping]: Factory method 'healthEndpointWebMvcHandlerMapping' threw exception; nested exception is java.util.NoSuchElementException: No value present
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.10.jar:5.3.10]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.10.jar:5.3.10]
	... 19 common frames omitted
Caused by: java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.get(Optional.java:143) ~[na:na]
	at org.springframework.boot.actuate.autoconfigure.health.HealthEndpointWebExtensionConfiguration.getHealthEndpoint(HealthEndpointWebExtensionConfiguration.java:79) ~[spring-boot-actuator-autoconfigure-2.6.0-M3.jar:2.6.0-M3]
	at org.springframework.boot.actuate.autoconfigure.health.HealthEndpointWebExtensionConfiguration.access$000(HealthEndpointWebExtensionConfiguration.java:66) ~[spring-boot-actuator-autoconfigure-2.6.0-M3.jar:2.6.0-M3]
	at org.springframework.boot.actuate.autoconfigure.health.HealthEndpointWebExtensionConfiguration$MvcAdditionalHealthEndpointPathsConfiguration.healthEndpointWebMvcHandlerMapping(HealthEndpointWebExtensionConfiguration.java:89) ~[spring-boot-actuator-autoconfigure-2.6.0-M3.jar:2.6.0-M3]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.10.jar:5.3.10]
	... 20 common frames omitted

[ThomasVitale]

@mbhave I investigated a bit more and found the following.

• When spring.jmx.enabled is set to true and the default Actuator configuration is used, the app starts up correctly.
• When spring.jmx.enabled is set to true and the Actuator is explicitly configured to expose a few different endpoints including health, the app starts up correctly.
• When spring.jmx.enabled is set to true and the Actuator is explicitly configured to expose a few different endpoints excluding health, the app does not start up correctly.
• When spring.jmx.enabled is set to false and the Actuator is explicitly configured to expose a few different endpoints excluding health, the app starts up correctly.

I have updated my example app, including an auto test that now fails and shows the error: https://github.com/ThomasVitale/spring-boot-additonal-health-group/blob/main/src/test/java/com/example/demo/DemoApplicationTests.java

[mbhave]

@ThomasVitale Thanks, this was the behavior that I observed as well.