Inject JAXBContext into spring

I am trying to inject a JAXBContext into spring application context, by:

<bean id="jaxbContext" class="javax.xml.bind.JAXBContext" factory-method="newInstance">
  <constructor-arg type="java.lang.Class" value="com.package.MyClassName"/>
</bean>

It throws an exception:

No matching factory method found: factory method 'newInstance'

And I also try :

<bean id="jaxbContext" class="javax.xml.bind.JAXBContext" factory-method="newInstance">
  <constructor-arg type="java.lang.String" value="com.package"/>
</bean>

And It throws an an exception:

javax.xml.bind.JAXBException: "com.package" doesnt contain ObjectFactory.class or jaxb.index I did put a jaxb.index file inside the package "com.package" and has a single line "MyClassName" in the file.