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Difference Between Constructor Injection and Setter Injection in Spring
Dependency Injection is a practice to pass dependent object to other objects. Spring has two types of Dependency Injection :
Constructor based Injection -When container call the constructor of the class. It should be used for mandatory dependencies.
Let’s say Class X is tightly dependent on Class Y then we should use constructor based injection.
Setter based Injection - It can be used by calling setter methods on your beans. It should be used for optional dependencies.
Both types of injection has their own pros and cons. Below is a list of some differences −
| Sr. No. | Key | Constructor based Injection | Setter based Injection |
|---|---|---|---|
| 1 |
Circular |
It doesn’t allow to create circular dependency |
It doesn’t check the circular dependency |
| 2 |
Ordering |
Constructor-based DI fixes the order in which the dependencies need to be injected. |
Setter-based DI helps us to inject the dependency only when it is required, as opposed to requiring it at construction time. |
| 3 |
MutilThread Environment |
Combining with final fields, constructor injection gives extra safety in multithreaded environment |
No extra benefit in setter injection |
| 4 |
Spring Code generation Library |
Spring code generation library doesn’t support constructor injection so it will not be able to create proxy. It will force you to use no-argument constructor. |
Spring framework level code uses setter injection |
| 5 |
Use Case |
It should be used for mandatory dependencies |
It should be used for optional dependencies. |
Example of Constructor Injection
public class ConstructorInjectionExample {
public ConstructorInjectionExample(BaseExmp baseExmp) {
// ...
}
}
<beans>
<bean id = "ConstructorInjectionExample" class = "x.y.ConstructorInjectionExample">
<constructor-arg ref = "baseExmp"/>
</bean>
<bean id = "baseExmp" class = "x.y.BaseExmp"/>
</beans>
Example of Setter Injection
public class SetterInjectionExample {
public void setBaseExmp(BaseExmp baseExmp) {
this.baseExmp = baseExmp;
}
}
<beans>
<bean id = "setterInjectionExample" class = "x.y.SetterInjectionExample">
<property name = "baseExmp" ref = "baseExmp"/>
</bean>
</beans> 
Updated on: 2020-09-09T08:49:37+05:30
22K+ Views
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