Difference between @Qualifier(“beanName”) and @Component(“beanName”)
Is there any difference between using @Qualifier("beanName") and @Component("beanName") ?
If not, is there a preferred approach?
spring
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
add a comment |
Is there any difference between using @Qualifier("beanName") and @Component("beanName") ?
If not, is there a preferred approach?
spring
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
add a comment |
Is there any difference between using @Qualifier("beanName") and @Component("beanName") ?
If not, is there a preferred approach?
spring
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
Is there any difference between using @Qualifier("beanName") and @Component("beanName") ?
If not, is there a preferred approach?
spring
spring
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
asked Dec 28 '18 at 13:00
Kamil RomanKamil Roman
5081817
5081817
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Generally, you use @Component("beanName") on the component, You use @Qualifier("beanName") on a class you are autowiring. Ex
@Component("myComponent1")
public class MyComponent1 implements MyComponent {
....
}
@Component("myComponent2")
public class MyComponent2 implements MyComponent {
....
}
@Service
public class SomeService implements MyService {
@Qualifier("myComponent1")
private MyComponent myComponent;
...
}
If there is more than one implementation of a bean/component, spring won't know which bean to select, so you need to use a the qualifier to specify which one is correct.
Additionally, you can use @Primary on one of the components, so it is always selected by default.
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
add a comment |
They are totally two different things , sound like you are compare apple and orange to me.
@Component is used to declare a class as a Spring bean which you cannot do it with @Qualifier.
@Qualifier is intended to help Spring to determine which bean to inject if there are more than 1 eligible bean for that injection. It is normally used with @Autowired which add more constraint on the injection point such that there are only one bean can be injected in it.
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Generally, you use @Component("beanName") on the component, You use @Qualifier("beanName") on a class you are autowiring. Ex
@Component("myComponent1")
public class MyComponent1 implements MyComponent {
....
}
@Component("myComponent2")
public class MyComponent2 implements MyComponent {
....
}
@Service
public class SomeService implements MyService {
@Qualifier("myComponent1")
private MyComponent myComponent;
...
}
If there is more than one implementation of a bean/component, spring won't know which bean to select, so you need to use a the qualifier to specify which one is correct.
Additionally, you can use @Primary on one of the components, so it is always selected by default.
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
add a comment |
Generally, you use @Component("beanName") on the component, You use @Qualifier("beanName") on a class you are autowiring. Ex
@Component("myComponent1")
public class MyComponent1 implements MyComponent {
....
}
@Component("myComponent2")
public class MyComponent2 implements MyComponent {
....
}
@Service
public class SomeService implements MyService {
@Qualifier("myComponent1")
private MyComponent myComponent;
...
}
If there is more than one implementation of a bean/component, spring won't know which bean to select, so you need to use a the qualifier to specify which one is correct.
Additionally, you can use @Primary on one of the components, so it is always selected by default.
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
add a comment |
Generally, you use @Component("beanName") on the component, You use @Qualifier("beanName") on a class you are autowiring. Ex
@Component("myComponent1")
public class MyComponent1 implements MyComponent {
....
}
@Component("myComponent2")
public class MyComponent2 implements MyComponent {
....
}
@Service
public class SomeService implements MyService {
@Qualifier("myComponent1")
private MyComponent myComponent;
...
}
If there is more than one implementation of a bean/component, spring won't know which bean to select, so you need to use a the qualifier to specify which one is correct.
Additionally, you can use @Primary on one of the components, so it is always selected by default.
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
Generally, you use @Component("beanName") on the component, You use @Qualifier("beanName") on a class you are autowiring. Ex
@Component("myComponent1")
public class MyComponent1 implements MyComponent {
....
}
@Component("myComponent2")
public class MyComponent2 implements MyComponent {
....
}
@Service
public class SomeService implements MyService {
@Qualifier("myComponent1")
private MyComponent myComponent;
...
}
If there is more than one implementation of a bean/component, spring won't know which bean to select, so you need to use a the qualifier to specify which one is correct.
Additionally, you can use @Primary on one of the components, so it is always selected by default.
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
edited Dec 28 '18 at 13:56
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
answered Dec 28 '18 at 13:43
mad_foxmad_fox
1,16321326
1,16321326
add a comment |
add a comment |
They are totally two different things , sound like you are compare apple and orange to me.
@Component is used to declare a class as a Spring bean which you cannot do it with @Qualifier.
@Qualifier is intended to help Spring to determine which bean to inject if there are more than 1 eligible bean for that injection. It is normally used with @Autowired which add more constraint on the injection point such that there are only one bean can be injected in it.
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
add a comment |
They are totally two different things , sound like you are compare apple and orange to me.
@Component is used to declare a class as a Spring bean which you cannot do it with @Qualifier.
@Qualifier is intended to help Spring to determine which bean to inject if there are more than 1 eligible bean for that injection. It is normally used with @Autowired which add more constraint on the injection point such that there are only one bean can be injected in it.
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
add a comment |
They are totally two different things , sound like you are compare apple and orange to me.
@Component is used to declare a class as a Spring bean which you cannot do it with @Qualifier.
@Qualifier is intended to help Spring to determine which bean to inject if there are more than 1 eligible bean for that injection. It is normally used with @Autowired which add more constraint on the injection point such that there are only one bean can be injected in it.
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
They are totally two different things , sound like you are compare apple and orange to me.
@Component is used to declare a class as a Spring bean which you cannot do it with @Qualifier.
@Qualifier is intended to help Spring to determine which bean to inject if there are more than 1 eligible bean for that injection. It is normally used with @Autowired which add more constraint on the injection point such that there are only one bean can be injected in it.
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
answered Dec 28 '18 at 14:51
Ken ChanKen Chan
38.4k1593112
38.4k1593112
add a comment |
add a comment |
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