java - Why are some @Enable* annotations picked up without @Configuration? -

i have following classes in different packages:

@enablewebmvc public class actuatorconfig {     // empty     // needed rest can hit actuator endpoints }  @component // remove line? @enablebatchprocessing public class batchconfig {     // empty }  @component @configuration public class schedulejob {     @autowired     private jobbuilderfactory jobbuilder;      @bean     protected jobexecutionlistener schedulejoblistener()     {         return new schedulejoblistener();     } } 

(edit: added application class)

@springbootapplication public class afxapplication {     public static void main(string[] args)     {         springapplication.run(afxapplication.class, args);     } } 

the first class turns on actuator features. don't need other annotations.

however, if remove @component batchconfig noted above, boot won't start because can't find dependency on jobbuilderfactory needs in order populate @autowired schedulejob.jobbuilder.

the exception:

caused by: org.springframework.beans.factory.nosuchbeandefinitionexception: no qualifying bean of type [org.springframework.batch.core.configuration.annotation.jobbuilderfactory] found dependency: expected @ least 1 bean qualifies autowire candidate dependency. dependency annotations: {@org.springframework.beans.factory.annotation.autowired(required=true)}     @ org.springframework.beans.factory.support.defaultlistablebeanfactory.raisenosuchbeandefinitionexception(defaultlistablebeanfactory.java:1373) ~[spring-beans-4.2.4.release.jar:4.2.4.release]     @ org.springframework.beans.factory.support.defaultlistablebeanfactory.doresolvedependency(defaultlistablebeanfactory.java:1119) ~[spring-beans-4.2.4.release.jar:4.2.4.release]     @ org.springframework.beans.factory.support.defaultlistablebeanfactory.resolvedependency(defaultlistablebeanfactory.java:1014) ~[spring-beans-4.2.4.release.jar:4.2.4.release]     @ org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject(autowiredannotationbeanpostprocessor.java:545) ~[spring-beans-4.2.4.release.jar:4.2.4.release] ... 25 common frames omitted 

when @component needed , when isn't needed?

(i pulled out @enable* annotations because i'm trying run unit tests don't need features enabled, , way can specify features want enable using @componentscan(basepackageclasses).)

thanks m. deinum, have answer.

by having @enable*, disabling @enableautoconfiguration. exception @enablebatchprocessing, explicitly required. (i understand so, not sure why cannot handled @enableautoconfiguration.)

the answer combination of application class listed above, , class:

@configuration @enablebatchprocessing public class batchconfig { } 

once in place, else worked.

how affect test code remain task day...