In Spring framework, you can wire beans automatically with auto-wiring feature. To enable it, just define the
“autowire” attribute in <bean>. In Spring, 5 Auto-wiring modes are supported.
no: Default, no auto wiring, set it manually via “ref” attribute
byName: Auto wiring by property name. If the name of a bean is same as the name of other bean
property, auto wire it.
byType: Auto wiring by property data type. If data type of a bean is compatible with the data type of other bean property, auto wire it.
constructor: byType mode in constructor argument.
autodetect: If a default constructor is found, use “autowired by constructor”; Otherwise, use “autowire by type”.
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