java - SpringBootApplication exclude when ComponentScanning other @SpringBootApplications

Question

I'm having some difficulty preventing Spring Boot from auto configuring some classes (in this example: SolrAutoConfiguration). To illustrate I've setup a much reduced example:

https://github.com/timtebeek/componentscan-exclusions

In reality there's some 20+ internal @SpringBootApplication projects, each with their own dependencies coming together. (Not ideal / not my idea, but hard to move away from now.)

The problem arises because multiple subprojects are using Solr 5.2.1, but Spring Boot is only compatible with 4.x. In the final application (module-b in the example) I want to import all @SpringBootApplication classes across all my modules, while preventing SolrAutoConfiguration from running:

@ComponentScan("project") // Broad scan across all company jars
@SpringBootApplication(exclude = { SolrAutoConfiguration.class }) // Failing exclude
public class ModuleBApp {
    public static void main(final String[] args) {
        SpringApplication.run(ModuleBApp.class, args);
    }
}

This fails, because any instance of @SpringBootApplication picked up through the @ComponentScan without the specific exclude, still loads SolrAutoConfiguration.

What can I do to properly exclude a auto configuration class when combining multiple @SpringBootApplication classes?

I've already tried to work with excludeFilters on my final @SpringBootApplication, but that hasn't yet lead to a solution.

Answer 1

Spring Boot 1.3.0.M3 introduced functionality to exclude autoconfiguration using properties: https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-1.3.0-M3-Release-Notes

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration

Note that it should say spring.autoconfigure.exclude, not excludes as in the release notes.

This helps prevent Spring Boot from loading autoconfig classes in the presence of multiple @EnableAutoConfiguration/@SpringBootApplication annotations.