How to add custom ApplicationContextInitializer to a spring boot application?

Question

One way to add custom ApplicationContextInitializer to spring web application is to add it in the web.xml file as shown below.

    <         


        

Answer 1

Another approach is to use context.initializer.classes=com.example.YourInitializer in a properties/yml file. I like this approach because then you can enable/disable initializers via environment specific props files.

It is mentioned only briefly in the spring boot docs

Answer 2

You can register them in META-INF/spring.factories

org.springframework.context.ApplicationContextInitializer=\
com.example.YourInitializer

You can also add them on your SpringApplication before running it

application.addInitializers(YourInitializer.class);
application.run(args);

Or on the builder

new SpringApplicationBuilder(YourApp.class)
    .initializers(YourInitializer.class);
    .run(args);

It wasn't obvious from the doc at first glance so I opened #5091 to check.