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As per spring documentation it has been mentioned
it is by design
I want to understand the possible thinking behind this design.
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In Spring, you can use @Autowired annotation to auto-wire bean on the setter method, constructor , or a field . Moreover, it can autowire the property in a particular bean. We must first enable the annotation using below configuration in the configuration file. We have enabled annotation injection.
The @Autowired annotation in spring automatically injects the dependent beans into the associated references of a POJO class. This annotation will inject the dependent beans by matching the data-type (i.e. Works internally as Autowiring byType).
Verdict. Generally, choose primitive types over wrapper classes unless using a wrapper class is necessary. Primitive Types will never be slower than Wrapper Objects, however Wrapper Objects have the advantage of being able to be null.
The default mode of Spring's traditional XML-based configuration is 'no' i.e no auto wiring is enabled by default. But, if you choose to use annotation-based configuration(<context:annotation-config>), & for instance, if you are using @Autowired , then the default method of auto wiring for this is "byType".
It's because Autowiring is just an alternative for referencing your existing beans in ApplicationContext. It expects a bean or a class, primitive is not a class and it differs from Object. Which is why you can't Autowire primitive types. You can use wrapper classes of the primitive types such as Integer, Double etc... to be able to use Autowiring for such types because you are now referring to a class.
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