将@Configuration类从一个项目导入到另一个项目

Question

I have to projects: ProjectA and ProjectB.

In ProjectA I have:

    package somePackageOfProjectA;
    @Configuration
    @EnableWebMvc
    @ComponentScan(basePackages = { "bla.bla" })
    public class ProjectAConfig extends WebMvcConfigurerAdapter { 
    ..
    }

In the classpath of ProjectB I've added ProjectA and I have the next configuration:

    package somePackageOfProjectB;
    @Configuration
    @EnableWebMvc
    @Import(ProjectAConfig .class)
    @ComponentScan(basePackages = { "bla.bla" })
    public class ProjectBConfig extends WebMvcConfigurerAdapter { 
    ..
    }

Until now all good, without any compilation error (ProjectAConfig is recognized in ProjectB).

The problem appear when I start the server. For an unknown reason is trying to search somePackageOfProjectA.ProjectAConfig only in ProjectB without searching it in ProjectA and an error occurs because is not existing.

Any ideas? Thank you in advance!

Answer 1

I can't be sure, but it feels wrong to me to have two classes that extend WebMvcConfigurerAdapter inside the same web application, what did you expect Spring to do, merge the list of ViewResolvers and HttpMessageConverters?

If you have beans that you want to reuse between projects, I would suggest that you put them into a separate @Configuration class instead og the class that extends WebMvcConfigurerAdapter.