multiple packages in context:component-scan, spring config

How can I add multiple packages in spring-servlet.xml file in context:component-scan element?

I have tried

<context:component-scan base-package="z.y.z.service" base-package="x.y.z.controller" />

and

<context:component-scan base-package="x.y.z.service, x.y.z.controller" />

and

<context:component-scan base-package="x.y.z.service" />
<context:component-scan base-package="x.y.z.controller" />

but got error:

org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [x.y.z.dao.daoservice.LoginDAO] found for dependency:

The following approach is correct:

<context:component-scan base-package="x.y.z.service, x.y.z.controller" /> 

Note that the error complains about x.y.z.dao.daoservice.LoginDAO, which is not in the packages mentioned above, perhaps you forgot to add it:

<context:component-scan base-package="x.y.z.service, x.y.z.controller, x.y.z.dao" /> 

Annotation Approach

@ComponentScan({ "x.y.z", "x.y.z.dao" })

You can add multiple base packages (see axtavt's answer), but you can also filter what's scanned inside the base package:

<context:component-scan base-package="x.y.z">
   <context:include-filter type="regex" expression="(service|controller)\..*"/>
</context:component-scan>