I am not getting repository bean in service class.
Your interface ActorRepository must be annotated with #Repository.
Related
I have a CDI bean that is annotated with #ApplicationScoped. Is there a way to tell Spring to pick it up during component scan, as if it were annotated with #Component? Spring does understand the #Inject annotation so why not #ApplicationScoped?
The idea is that it would be handy to use CDI beans in Spring (at least if they only use plain dependency injection without the fancy CDI stuff like interceptors, decorators...)
It is not entirely clear how is your code structured, if possible just annotate it with #Component as well. A component bean in Spring has similar properties as an application scoped bean. The default scope of a bean in Spring is singleton and it can be proxied, similar to what #ApplicationScoped would offer.
Spring does understand the #Inject annotation so why not #ApplicationScoped?
Spring offers support for JSR 330 annotation, #ApplicationScoped is nor part of those.
I have DAO marked with #Repository annotation in the main folder. I need to access this DAO in my test class. I'm using #Autowire for this but the DAO object is throwing a null pointer exception.
Please help as I'm relatively new to Spring boot
Well i am a newbie in spring boot. I was working on a project where I needed to #Autowired my Entity in a controller class. But I ended up with error:
Field repository in abc required a bean of type 'xyz' that could not be found.
But it solved after adding #Component in Entity class.
So my questions are:
Why Spring boot was not scanning my Entity class as it was under #SpringBootApplication declaration?
When and where we should use #Component annotation in our application?
Use #Component to flag your Pojo as Spring Bean, so that you inject it into other beans with #Autowired
Use #Entity to flag your Pojo as JPA or Spring Data managed bean to read or write it to a database
I'm using Spring Data JPA repositories (like MyRepo extends JpaRepository) and it works without #Repository and without #EnableJpaRepositories annotations. Could someone explain why?
Probably you are using Spring Boot.
Spring Data repositories usually extend from the Repository or CrudRepository interfaces. If you use auto-configuration, repositories are searched from the package containing your main configuration class (the one annotated with #EnableAutoConfiguration or #SpringBootApplication) down.
Please check the Spring Boot Reference Documentation (v2.7.2) for more details.
you don't need #Repository to make use of Spring Data JPA.
The Interface extending the CrudRepository or JPARepository would work even without annotating it with #Repository.
The Core reason why you need to have this annotation in place is it makes unchecked exceptions thrown in the DAO layer eligible to be translated into Spring DataAccessException. Which in turn would be easier to work with. This is the important aspect of using #Repository
More details see this -> https://www.youtube.com/watch?v=z2re1MfWtz0&list=PLO0KWyajXMh4fGMvAw1yQ1x7mWayRcmX3&index=8&t=0s
For more information look into these class which is used to auto-configure Spring Data JPA Repositories:
JpaRepositoriesAutoConfigureRegistrar
Docs : http://www.atetric.com/atetric/javadoc/org.springframework.boot/spring-boot-autoconfigure/1.2.0.RELEASE/org/springframework/boot/autoconfigure/data/jpa/JpaRepositoriesAutoConfigureRegistrar.html
#EnableJpaRepositories
private static class EnableJpaRepositoriesConfiguration {
}
I am using spring boot and Autowired NamedParameterJdbcTemplate as
#Autowired
private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
I want to use different name for instance
private NamedParameterJdbcTemplate myTemplate;
How can this be achived in spring boot as I dont I have access to implementation class as I am using spring JDBC in POM as dependency.
Spring by default autowires the dependencies by Type reference not by name. Hence ur code will directly work without any changes required.
private NamedParameterJdbcTemplate myTemplate;
Spring will look for a bean of type NamedParameterJdbcTemplate and Autowire it, unless u have explicitly specified autowired by name. In the case of autowireby name u can use the #Qualifier to specify the bean name to autowire.
#Autowired
#Qualifier("beanName")