What is the difference between Inject and Autowired in Spring Framework Which one to use under what condition

Question

I am going through some blogs on SpringSource and in one of the blogs  author is using  Inject and I suppose he can also use  Autowired   Here is the piece of code    Inject private CustomerOrderService customerOrderService   I am not sure about the difference between  Inject and  Autowired and would appreciate it if someone explained their difference and which one to use under what situation

User · Answer

Inject has no  required  attribute

User · Answer

To handle the situation in which there is no wiring  beans are available with  Autowired required attribute set to false   But when using  Inject  the Provider interface works with the bean which means that the bean is not injected directly but with the Provider

User · Answer

Autowired required false  By default the dependency injection for  Autowired must be fulfilled because the value of required attribute is true by default  We can change this behavior by using  Autowired required false   In this case if bean is not found for dependency injection  it will not through error   Please have look at  https   www concretepage com spring spring-autowired-annotation required-false  But  Inject doesn   t need  required false  it will not through error if dependency is not found

User · Answer

Autowired annotation is defined in the Spring framework    Inject annotation is a standard annotation  which is defined in the standard  Dependency Injection for Java   JSR-330   Spring  since the version 3 0  supports the generalized model of dependency injection which is defined in the standard JSR-330   Google Guice frameworks and Picocontainer framework also support this model    With  Inject can be injected the reference to the implementation of the  Provider interface  which allows injecting the deferred references   Annotations  Inject and  Autowired- is almost complete analogies  As well as  Autowired annotation   Inject annotation can be used for automatic binding properties  methods  and constructors   In contrast to  Autowired annotation   Inject annotation has no required attribute  Therefore  if the dependencies will not be found - will be thrown an exception   There are also differences in the clarifications of the binding properties  If there is ambiguity in the choice of components for the injection the  Named qualifier should be added  In a similar situation for  Autowired annotation will be added  Qualifier qualifier  JSR-330 defines it s own  Qualifier annotation and via this qualifier annotation  Named is defined

User · Answer

As of Spring 3 0  Spring offers support for JSR-330 dependency injection annotations   Inject   Named   Singleton    There is a separate section in the Spring documentation about them  including comparisons to their Spring equivalents

User · Answer

In addition to the above    The default scope for  Autowired beans is Singleton whereas using JSR 330  Inject annotation it is like Spring s prototype  There is no equivalent of  Lazy in JSR 330 using  Inject  There is no equivalent of  Value in JSR 330 using  Inject

User · Answer

Better use  Inject all the time  Because it is java configuration approach provided by sun  which makes our application agnostic to the framework  So if you spring also your classes will work   If you use  Autowired it will works only with spring because  Autowired is spring provided annotation

User · Answer

The key difference noticed when reading the Spring Docs  between  Autowired and  Inject is that   Autowired has the  required  attribute while the  Inject has no  required  attribute

User · Answer

Assuming here you re referring to the javax inject Inject annotation   Inject is part of the Java CDI  Contexts and Dependency Injection  standard introduced in Java EE 6  JSR-299   read more  Spring has chosen to support using the  Inject annotation synonymously with their own  Autowired annotation  So  to answer your question   Autowired is Spring s own annotation   Inject is part of a Java technology called CDI that defines a standard for dependency injection similar to Spring  In a Spring application  the two annotations works the same way as Spring has decided to support some JSR-299 annotations in addition to their own

User · Answer

Here is a blog post that compares  Resource   Inject  and  Autowired  and appears to do a pretty comprehensive job   From the link      With the exception of test 2  amp  7 the configuration and outcomes were   identical  When I looked under the hood I determined that the       Autowired    and     Inject    annotation behave identically  Both of   these annotations use the    AutowiredAnnotationBeanPostProcessor    to   inject dependencies      Autowired    and     Inject    can be used   interchangeable to inject Spring beans  However the     Resource      annotation uses the    CommonAnnotationBeanPostProcessor    to inject   dependencies  Even though they use different post processor classes   they all behave nearly identically  Below is a summary of their   execution paths    Tests 2 and 7 that the author references are  injection by field name  and  an attempt at resolving a bean using a bad qualifier   respectively   The Conclusion should give you all the information you need

User · Answer

The  Inject annotation is one of the JSR-330 annotations collection  This has Match by Type Match by Qualifier  Match by Name execution paths  These execution paths are valid for both setter and field injection The behavior of  Autowired annotation is same as the  Inject annotation  The only difference is the  Autowired annotation is a part of the Spring framework   Autowired annotation also has the above execution paths  So I recommend the  Autowired for your answer

[java] What is the difference between @Inject and @Autowired in Spring Framework? Which one to use under what condition?

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