Fluent Builder API

If you need to build an ApplicationContext hierarchy (multiple contexts with a parent/child relationship) or if you prefer using a “fluent” builder API, you can use the SpringApplicationBuilder.

The SpringApplicationBuilder lets you chain together multiple method calls and includes parent and child methods that let you create a hierarchy, as shown in the following example:

Java
Kotlin

		new SpringApplicationBuilder()
				.sources(Parent.class)
				.child(Application.class)
				.bannerMode(Banner.Mode.OFF)
				.run(args);

		SpringApplicationBuilder()
			.sources(Parent::class.java)
			.child(Application::class.java)
			.bannerMode(Banner.Mode.OFF)
			.run(*args)

There are some restrictions when creating an ApplicationContext hierarchy. For example, Web components must be contained within the child context, and the same Environment is used for both parent and child contexts. See the SpringApplicationBuilder Javadoc for full details.