java - Add packages to component-scan -

i have project spring container. let's project called my-common-library , uses namespace my.common. scans components in namespace, specified in common-context.xml looks following

<beans ...>     <context:component-scan base-package="my.common"/> </beans> 

among other things scan detects classes annotated @mycomponent.

now reuse project possible. let's start new project my-client uses in namespace my.client. my-client consists of components annotated @mycomponent.

in ideal world add dependency my-common-library , @mycomponents scanned , registered. problem new namespace unknown original my-common-library.

one solution i'm aware of add updated common-context.xml my-client like

<beans ...>     <context:component-scan base-package="my.common,my.client"/> </beans> 

that work, seems quite fragile. there more elegant solution maybe?

attempting implement component registration libraries via component-scan fragile, in opinion.

if reusing code, recommend explicitly importing my-common-library dependency. example, using java-based spring configuration:

@configuration @componentscan("my.common")  public class mycommonlibraryconfig {   } 

on 'my-client`:

@configuration @import(mycommonlibraryconfig.class) @componentscan("my.client")  public class myclientconfig {  } 

since my-client depends on my-library, best define dependency explicitly.

on other hand, if want implement plugin system, need use package-based convention discover dependencies since component using dependencies not know dependencies until run-time.

in case, recommend defining registration package name such my.plugin, spring configuration component depends on plugins need define component scan on my.plugin, , each plugin need define @components or @configurations beans in same my.plugin package.

if want more control, can add filter component-scan register bean annotation. example, assuming define @myplugin annotation:

@componentscan(    basepackages = {"my.plugin"},    includefilters = @componentscan.filter(       value= myplugin.class,        type = filtertype.annotation    ) )