Filter specific packages in @ComponentScan

Question

I want to switch from XML based to Java based configuration in Spring. Now we have something like this in our application context:

<context:component-scan base-package="foo.bar">     <context:exclude-filter type="annotation" expression="o.s.s.Service"/> </context:component-scan> <context:component-scan base-package="foo.baz" /> 

But if I write something like this...

 @ComponentScan(     basePackages = {"foo.bar", "foo.baz"},     excludeFilters = @ComponentScan.Filter(        value= Service.class,         type = FilterType.ANNOTATION     )  ) 

... it will exclude services from both packages. I have the strong feeling I'm overlooking something embarrassingly trivial, but I couldn't find a solution to limit the scope of the filter to foo.bar.

Answer 1

You simply need to create two Config classes, for the two @ComponentScan annotations that you require.

So for example you would have one Config class for your foo.bar package:

@Configuration @ComponentScan(basePackages = {"foo.bar"},      excludeFilters = @ComponentScan.Filter(value = Service.class, type = FilterType.ANNOTATION) ) public class FooBarConfig { } 

and then a 2nd Config class for your foo.baz package:

@Configuration @ComponentScan(basePackages = {"foo.baz"}) public class FooBazConfig { } 

then when instantiating the Spring context you would do the following:

new AnnotationConfigApplicationContext(FooBarConfig.class, FooBazConfig.class); 

An alternative is that you can use the @org.springframework.context.annotation.Import annotation on the first Config class to import the 2nd Config class. So for example you could change FooBarConfig to be:

@Configuration @ComponentScan(basePackages = {"foo.bar"},      excludeFilters = @ComponentScan.Filter(value = Service.class, type = FilterType.ANNOTATION) ) @Import(FooBazConfig.class) public class FooBarConfig { } 

Then you would simply start your context with:

new AnnotationConfigApplicationContext(FooBarConfig.class)