Allow to set loadOnStartup on actuator EndpointServlet's

[juliojgd]

spring-boot/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/ServletEndpointRegistrar.java

Lines 73 to 78 in badccc0

	EndpointServlet endpointServlet = endpoint.getEndpointServlet();
	Dynamic registration = servletContext.addServlet(name,
	endpointServlet.getServlet());
	registration.addMapping(urlMapping);
	registration.setInitParameters(endpointServlet.getInitParameters());
	logger.info("Registered '" + path + "' to " + name);

Why is setting loadOnStartup not allowed in ServletEndpointRegistrar?
In my specific use case I need that the invocation of 'init' method in wrapped Servlet instance be on startup, not in the first http invocation.
Is there a reason to not provide this option for EndPointServlet's?

To provide it, org.springframework.boot.actuate.endpoint.web.EndpointServlet should contain a property 'loadOnStartup' in addition to already present 'initParameters' property. If there is no reason to not do it, I can provide a PR.

Thanks for answering.

[wilkinsona]

I think an attribute for configuring loadOnStartup makes sense and a PR would be most welcome. Thanks.

[rhamedy]

@wilkinsona if not already taken can I work on this issue?

[wilkinsona]

Thank you for the offer. I'd like to give @juliojgd a little while to prepare something if they're still interested in doing so. Let's give them a week or so and see where we are.

[juliojgd]

Still interested. Working on it.

[wilkinsona]

Closing in favour of #16053.