@Autowired and @Qualifier Annotation | Autowire byName and byType | Configure Autowiring in XML Java
@Autowired and @Qualifier Annotation | Autowire byName and byType | Configure Autowiring in XML file & at Java side using @Autowired
Autowiring in Spring is a feature that allows the framework to automatically inject dependencies into a Spring bean. This is done by scanning the classpath for components and wiring them together based on certain rules.
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📚 Topics Covered:
Configure autowiring in XML file & at Java side using @Autowired
*1) Create HelloTuneService.java & MissedCallAlertService.java which implements Service.java class*
*2) Create Airtel.java to activate any one service*
3) Add spring dependencies & create beans.xml file to create airtel beans and service beans
4) Use ApplicationContext IoC container to load the xml file & do the dependency injection
Till now we are manually configuring the service property on Airtel beans
*5) Now lets autowire the property (spring, could you please automatically wire up my dependency)*
6) Introducing *autowire="byName"* property
Will inject only if bean id(bean id="**service**" c...) matched with field name ( private Service **service**;)
7) Introducing *autowire="byType"* property
Will inject only if type of variable( private *MissedCallAlertService* service;) & type of bean match(...wired_qualifier_demo.**MissedCallAlertService** /bean)
8) Introducing *autowire="constructor"* property
used Constructor injection method, so arg constructor should be present
9) Configure autowiring at Java side using spring *@Autowired* annotation
9) Remove autowise from xml
10) @Autowired before the constructor, same as autowire="constructor"
No default constructor found, spring uses default constructor to inject the object
11) Activate @Autowired manually using context:annotation-config, before that add context schema
12) Move @Autowired to setter method, byName or byType
first spring will try to resolve with "byType" if fails, then with *byName* if that too fails(spring confused/conflict) then
expected single matching bean but found 2: helloTuneServiceObj,missedCallAlertServiceObj
14) Introducing *@Qualifier* annotation (@Qualifier("missedCallAlertServiceObj"))
15) @Autowired before the dependency
now spring is not using setter method to inject the dependency, so remove the setter method, and constructor also
15) @Autowired not possible in primitive data type, can any one guess?
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