Why doesn't Autowiring work for this Spring MVC String bean property?

@Autowired
private String defaultLanguage;

When I try to @Autowire the defaultLanguage field of the CountryBean class as follows:

<beans:bean id="countryBean" class="geoapp.CountryBean">
    <beans:property name="defaultLanguage" value="English" />
</beans:bean>

I get this error:

Error creating bean with name 'CountryBean': 
Injection of autowired dependencies failed; 
nested exception is 
org.springframework.beans.factory.BeanCreationException: 
Could not autowire field: 
private java.lang.String geoapp.Count开发者_如何学PythonryBean.defaultLanguage; 
nested exception is 
org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No matching bean of type [java.lang.String] found for dependency:
expected at least 1 bean which qualifies as autowire candidate for 
this dependency. 
Dependency annotations:
{@org.springframework.beans.factory.annotation.Autowired(required=true)}:

When it says No matching bean of type [java.lang.String] found for dependency, I wonder if there's something else I need to say to let it know that the value English is a String?

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Since you are explicitly specifying the property value via xml, there is no need to have the AutoWired annotation.

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You are not using the autowire feature properly. You can either:

• Use the <beans:property ... /> in the XML and add a setter for the property in the class
• Use the @Autowired annotation that automatically looks in the Spring context for an existing bean that has your property class (in your case, String)

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The other answers are correct, but to clarify things, those beans defined in the *.xml files are processed before any @ type annotations get processed. So for your example, the bean "CountryBean" is processed before the property "defaultLanguage" is processed, leaving the dependency null.

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Yet another 'the other answers are correct', but here's another tidbit for you -- Spring will automatically set enums for you, so if you had an enum of languages and your bean definition had something like ", you'd get a type safe enum in there, instead of a String.

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If you want autowiring your property, you need to make a new bean for that defaultLanguage String. Then equate the bean's name and field's name.