Spring's Annotation Type Required deprecation
Spring's Annotation Type Required is marked as deprecated
Deprecated.
as of 5.1, in favor of using constructor injection for required settings (or a custom InitializingBean implementation)
Same for relevant RequiredAnnotationBeanPostProcessor
But it's not clear what's the replacement, it seems that it should be unavailable.
Is this change prevent us marking method as required unless it's part of constructor method ? to prevent unexpected exceptions on class creation ?
java spring deprecated
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
add a comment |
Spring's Annotation Type Required is marked as deprecated
Deprecated.
as of 5.1, in favor of using constructor injection for required settings (or a custom InitializingBean implementation)
Same for relevant RequiredAnnotationBeanPostProcessor
But it's not clear what's the replacement, it seems that it should be unavailable.
Is this change prevent us marking method as required unless it's part of constructor method ? to prevent unexpected exceptions on class creation ?
java spring deprecated
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
add a comment |
Spring's Annotation Type Required is marked as deprecated
Deprecated.
as of 5.1, in favor of using constructor injection for required settings (or a custom InitializingBean implementation)
Same for relevant RequiredAnnotationBeanPostProcessor
But it's not clear what's the replacement, it seems that it should be unavailable.
Is this change prevent us marking method as required unless it's part of constructor method ? to prevent unexpected exceptions on class creation ?
java spring deprecated
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
Spring's Annotation Type Required is marked as deprecated
Deprecated.
as of 5.1, in favor of using constructor injection for required settings (or a custom InitializingBean implementation)
Same for relevant RequiredAnnotationBeanPostProcessor
But it's not clear what's the replacement, it seems that it should be unavailable.
Is this change prevent us marking method as required unless it's part of constructor method ? to prevent unexpected exceptions on class creation ?
java spring deprecated
java spring deprecated
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
edited Nov 18 '18 at 6:58
user7294900
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
asked Nov 18 '18 at 6:48
user7294900user7294900
22.1k113258
22.1k113258
add a comment |
add a comment |
1 Answer
1
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votes
There are three ways to inject a bean via annotation:
Field injection
@Autowired
private FooService fooService;
Setter injection
private FooService fooService;
@Autowired
public void setFooService(FooService fooService) {
this.fooService = fooService
}
Constructor injection (this is the mentioned replacement)
private final FooService fooService;
@Autowired
public MyComponent(FooService fooService) {
this.fooService = fooService;
}
As you can see, the only way to declare your Service final is by using the constructor injection, which replaces the @Required annotation because it forces the user of your class to instantiate it with the required services. The user does not have to be Spring, it could be a simple unit test as well.
You should use constructor injection for mandatory dependencies and setter injections for optional dependencies instead of field injection.
Some reasons why:
- It makes it clear to everybody which dependencies are required
- It makes testing easier
- You can make your objects immutable
Further reading:
- http://olivergierke.de/2013/11/why-field-injection-is-evil/
- https://www.vojtechruzicka.com/field-dependency-injection-considered-harmful/
- https://spring.io/blog/2007/07/11/setter-injection-versus-constructor-injection-and-the-use-of-required/
answered Nov 18 '18 at 7:42
quataxquatax
11516
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
There are three ways to inject a bean via annotation:
Field injection
@Autowired
private FooService fooService;
Setter injection
private FooService fooService;
@Autowired
public void setFooService(FooService fooService) {
this.fooService = fooService
}
Constructor injection (this is the mentioned replacement)
private final FooService fooService;
@Autowired
public MyComponent(FooService fooService) {
this.fooService = fooService;
}
As you can see, the only way to declare your Service final is by using the constructor injection, which replaces the @Required annotation because it forces the user of your class to instantiate it with the required services. The user does not have to be Spring, it could be a simple unit test as well.
You should use constructor injection for mandatory dependencies and setter injections for optional dependencies instead of field injection.
Some reasons why:
- It makes it clear to everybody which dependencies are required
- It makes testing easier
- You can make your objects immutable
Further reading:
- http://olivergierke.de/2013/11/why-field-injection-is-evil/
- https://www.vojtechruzicka.com/field-dependency-injection-considered-harmful/
- https://spring.io/blog/2007/07/11/setter-injection-versus-constructor-injection-and-the-use-of-required/
answered Nov 18 '18 at 7:42
quataxquatax
11516
add a comment |
There are three ways to inject a bean via annotation:
Field injection
@Autowired
private FooService fooService;
Setter injection
private FooService fooService;
@Autowired
public void setFooService(FooService fooService) {
this.fooService = fooService
}
Constructor injection (this is the mentioned replacement)
private final FooService fooService;
@Autowired
public MyComponent(FooService fooService) {
this.fooService = fooService;
}
As you can see, the only way to declare your Service final is by using the constructor injection, which replaces the @Required annotation because it forces the user of your class to instantiate it with the required services. The user does not have to be Spring, it could be a simple unit test as well.
You should use constructor injection for mandatory dependencies and setter injections for optional dependencies instead of field injection.
Some reasons why:
- It makes it clear to everybody which dependencies are required
- It makes testing easier
- You can make your objects immutable
Further reading:
- http://olivergierke.de/2013/11/why-field-injection-is-evil/
- https://www.vojtechruzicka.com/field-dependency-injection-considered-harmful/
- https://spring.io/blog/2007/07/11/setter-injection-versus-constructor-injection-and-the-use-of-required/
answered Nov 18 '18 at 7:42
quataxquatax
11516
add a comment |
There are three ways to inject a bean via annotation:
Field injection
@Autowired
private FooService fooService;
Setter injection
private FooService fooService;
@Autowired
public void setFooService(FooService fooService) {
this.fooService = fooService
}
Constructor injection (this is the mentioned replacement)
private final FooService fooService;
@Autowired
public MyComponent(FooService fooService) {
this.fooService = fooService;
}
As you can see, the only way to declare your Service final is by using the constructor injection, which replaces the @Required annotation because it forces the user of your class to instantiate it with the required services. The user does not have to be Spring, it could be a simple unit test as well.
You should use constructor injection for mandatory dependencies and setter injections for optional dependencies instead of field injection.
Some reasons why:
- It makes it clear to everybody which dependencies are required
- It makes testing easier
- You can make your objects immutable
Further reading:
- http://olivergierke.de/2013/11/why-field-injection-is-evil/
- https://www.vojtechruzicka.com/field-dependency-injection-considered-harmful/
- https://spring.io/blog/2007/07/11/setter-injection-versus-constructor-injection-and-the-use-of-required/
answered Nov 18 '18 at 7:42
quataxquatax
11516
There are three ways to inject a bean via annotation:
Field injection
@Autowired
private FooService fooService;
Setter injection
private FooService fooService;
@Autowired
public void setFooService(FooService fooService) {
this.fooService = fooService
}
Constructor injection (this is the mentioned replacement)
private final FooService fooService;
@Autowired
public MyComponent(FooService fooService) {
this.fooService = fooService;
}
As you can see, the only way to declare your Service final is by using the constructor injection, which replaces the @Required annotation because it forces the user of your class to instantiate it with the required services. The user does not have to be Spring, it could be a simple unit test as well.
You should use constructor injection for mandatory dependencies and setter injections for optional dependencies instead of field injection.
Some reasons why:
- It makes it clear to everybody which dependencies are required
- It makes testing easier
- You can make your objects immutable
Further reading:
- http://olivergierke.de/2013/11/why-field-injection-is-evil/
- https://www.vojtechruzicka.com/field-dependency-injection-considered-harmful/
- https://spring.io/blog/2007/07/11/setter-injection-versus-constructor-injection-and-the-use-of-required/
answered Nov 18 '18 at 7:42
quataxquatax
11516
answered Nov 18 '18 at 7:42
quataxquatax
11516
answered Nov 18 '18 at 7:42
quataxquatax
11516
answered Nov 18 '18 at 7:42
quataxquatax
11516
11516
add a comment |
add a comment |
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