Add context path to Spring Boot application

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Why are you trying to roll your own solution. Spring-boot already supports that.

If you don’t already have one, add an application.properties file to src\main\resources. In that properties file, add 2 properties:

server.contextPath=/mainstay
server.port=12378

UPDATE (Spring Boot 2.0)

As of Spring Boot 2.0 (due to the support of both Spring MVC and Spring WebFlux) the contextPath has been changed to the following:

server.servlet.context-path=/mainstay

You can then remove your configuration for the custom servlet container. If you need to do some post processing on the container you can add a EmbeddedServletContainerCustomizer implementation to your configuration (for instance to add the error pages).

Basically the properties inside the application.properties serve as a default you can always override them by using another application.properties next to the artifact you deliver or by adding JVM parameters (-Dserver.port=6666).

See also The Reference Guide especially the properties section.

The class ServerProperties implements the EmbeddedServletContainerCustomizer. The default for contextPath is "". In your code sample you are setting the contextPath directly on the TomcatEmbeddedServletContainerFactory. Next the ServerProperties instance will process this instance and reset it from your path to "". (This line does a null check but as the default is "" it always fail and set the context to "" and thus overriding yours).

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