java - Spring's component-scan don't find class in external jar -

i'm new in spring, "autowired" class interface implement class in external jar.

this jar's code:

@component public class mongospring implements imongo {       mongospring() throws unknownhostexception {         system.out.println("mongo template builder");     }      @required     public void save()  {         system.out.println("mongo template save");     } } 

the class interface:

@component public interface imongo {     void save(); } 

the class make autowire

@component public class core {     @autowired     public imongo db ;      public void run () {          log.info("core ");         db.save();     } 

the main class

public class mongoapp {      private static applicationcontext context;      public static void main(string[] args) throws exception {           context = new classpathxmlapplicationcontext("path.xml");           core c = (core)context.getbean(core.class);          c.run();       } } 

the bean file:

<beans xmlns="http://www.springframework.org/schema/beans"     xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xmlns:context="http://www.springframework.org/schema/context"     xsi:schemalocation="http://www.springframework.org/schema/beans     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd     http://www.springframework.org/schema/context     http://www.springframework.org/schema/context/spring-context-3.0.xsd">          <context:annotation-config />         <context:component-scan base-package="org.spring.mongodb.example" />      </bean> </beans> 

when run gives me following error:

exception in thread "main" org.springframework.beans.factory.beancreationexception: error creating bean name 'core': injection of autowired dependencies failed;  nested exception org.springframework.beans.factory.beancreationexception: not autowire field: public org.spring.mongodb.example.imongo org.spring.mongodb.example.core.db;  nested exception org.springframework.beans.factory.nosuchbeandefinitionexception: no matching bean of type [org.spring.mongodb.example.imongo] found dependency: expected @ least 1 bean qualifies autowire candidate dependency.  dependency annotations: {@org.springframework.beans.factory.annotation.autowired(required=true)} 

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what can do? i'm using spring 3.2.0 sts

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i have removed @component interface , @require doesn't change. jar file in classpath , package correct. thank you