问题
I\'m developing a spring boot application and I\'m running into an issue here. I\'m trying to inject a @Repository annotated interface and it doesn\'t seem to work at all. I\'m getting this error
org.springframework.beans.factory.BeanCreationException: Error creating bean with name \'springBootRunner\': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.pharmacy.persistence.users.dao.UserEntityDao com.pharmacy.config.SpringBootRunner.userEntityDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.pharmacy.persistence.users.dao.UserEntityDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
at com.pharmacy.config.SpringBootRunner.main(SpringBootRunner.java:25)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.pharmacy.persistence.users.dao.UserEntityDao com.pharmacy.config.SpringBootRunner.userEntityDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.pharmacy.persistence.users.dao.UserEntityDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
... 16 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.pharmacy.persistence.users.dao.UserEntityDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
... 18 common frames omitted
Here is my code:
Main application class:
package com.pharmacy.config;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(\"org.pharmacy\")
public class SpringBootRunner {
public static void main(String[] args) {
SpringApplication.run(SpringBootRunner.class, args);
}
}
Entity class:
package com.pharmacy.persistence.users;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class UserEntity {
@Id
@GeneratedValue
private Long id;
@Column
private String name;
}
Repository interface:
package com.pharmacy.persistence.users.dao;
import com.pharmacy.persistence.users.UserEntity;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface UserEntityDao extends CrudRepository<UserEntity,Long>{
}
Controller:
package com.pharmacy.controllers;
import com.pharmacy.persistence.users.UserEntity;
import com.pharmacy.persistence.users.dao.UserEntityDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HomeController {
@Autowired
UserEntityDao userEntityDao;
@RequestMapping(value = \"/\")
public String hello() {
userEntityDao.save(new UserEntity(\"ac\"));
return \"Test\";
}
}
build.gradle
buildscript {
ext {
springBootVersion = \'1.2.2.RELEASE\'
}
repositories {
mavenCentral()
}
dependencies {
classpath(\"org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}\")
}
}
apply plugin: \'java\'
apply plugin: \'idea\'
apply plugin: \'spring-boot\'
mainClassName = \"com.pharmacy.config.SpringBootRunner\"
jar {
baseName = \'demo\'
version = \'0.0.1-SNAPSHOT\'
}
repositories {
mavenCentral()
}
dependencies {
compile(\"org.springframework.boot:spring-boot-starter-data-jpa\")
compile(\"org.springframework.boot:spring-boot-starter-web\")
compile(\"org.springframework.boot:spring-boot-starter-ws\")
compile(\"postgresql:postgresql:9.0-801.jdbc4\")
testCompile(\"org.springframework.boot:spring-boot-starter-test\")
}
application.properties:
spring.view.prefix: /
spring.view.suffix: .html
spring.jpa.database=POSTGRESQL
spring.jpa.show-sql=false
spring.jpa.hibernate.ddl-auto=update
spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:5432/postgres
spring.datasource.username=postgres
spring.datasource.password=abc123
I even compared my code with Accessing data jpa, and I\'m running out of ideas what\'s wrong with this code. Any help appreciated. Thanks in advance.
EDITED: I changed my code as suggested to look like above, and I\'m not getting that error when I\'m injecting my @Repository interface into another component. However, I have a problem now - my component cannot be retrieved (I used debugging). What I\'m doing wrong so spring cannot find my component?
回答1:
When the repository package is different to @SpringBootApplication/@EnableAutoConfiguration, base package of @EnableJpaRepositories is required to be defined explicitly.
Try to add @EnableJpaRepositories("com.pharmacy.persistence.users.dao") to SpringBootRunner
回答2:
I had the same issues with Repository not being found. So what I did was to move everything into 1 package. And this worked meaning that there was nothing wrong with my code. I moved the Repos & Entities into another package and added the following to SpringApplication class.
@EnableJpaRepositories("com...jpa")
@EntityScan("com...jpa")
After that, I moved the Service (interface & implementation) to another package and added the following to SpringApplication class.
@ComponentScan("com...service")
This solved my issues.
回答3:
There is another cause for this type of problem what I would like to share, because I struggle in this problem for some time and I could't find any answer on SO.
In a repository like:
@Repository
public interface UserEntityDao extends CrudRepository<UserEntity, Long>{
}
If your entity UserEntity does not have the @Entity annotation on the class, you will have the same error.
This error is confusing for this case, because you focus on trying to resolve the problem about Spring not found the Repository but the problem is the entity. And if you came to this answer trying to test your Repository, this answer may help you.
回答4:
It seems your @ComponentScan annotation is not set properly.
Try :
@ComponentScan(basePackages = {"com.pharmacy"})
Actually you do not need the component scan if you have your main class at the top of the structure, for example directly under com.pharmacy package.
Also, you don't need both
@SpringBootApplication
@EnableAutoConfiguration
The @SpringBootApplication annotation includes @EnableAutoConfiguration by default.
回答5:
I had a similar issue where I was receiving NoSuchBeanDefinitionException in Spring Boot (basically while working on CRUD repository), I had to put the below annotations on the main class:
@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan(basePackages={"<base package name>"})
@EnableJpaRepositories(basePackages="<repository package name>")
@EnableTransactionManagement
@EntityScan(basePackages="<entity package name>")
Also, make sure you have the @Component annotations in place on the implementations.
回答6:
To extend onto above answers, You can actually add more than one package in your EnableJPARepositories tag, so that you won't run into "Object not mapped" error after only specifying the repository package.
@SpringBootApplication
@EnableJpaRepositories(basePackages = {"com.test.model", "com.test.repository"})
public class SpringBootApplication{
}
回答7:
Here is the mistake: as someone said before, you are using org.pharmacy insted of com.pharmacy in componentscan
package **com**.pharmacy.config;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan("**org**.pharmacy")
public class SpringBootRunner {
回答8:
I had a similar problem but with a different cause:
In my case the problem was that in the interface defining the repository
public interface ItemRepository extends Repository {..}
I was omitting the types of the template. Setting them right:
public interface ItemRepository extends Repository<Item,Long> {..}
did the trick.
回答9:
I had some problems with this topic too. You have to make sure you define the packages in Spring boot runner class like this example below:
@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan({"controller", "service"})
@EntityScan("entity")
@EnableJpaRepositories("repository")
public class Application {
public static void main(String[] args){
SpringApplication.run(Application.class, args);
}
I hope this helps!
回答10:
You are scanning the wrong package: @ComponentScan("org.pharmacy")
Where as it should be: @ComponentScan("com.pharmacy")
Since your package names start with com and not org.
回答11:
In SpringBoot, the JpaRepository are not auto-enabled by default. You have to explicitly add
@EnableJpaRepositories("packages")
@EntityScan("packages")
回答12:
It could be to do with the package you have it in. I had a similar problem:
Description:
Field userRepo in com.App.AppApplication required a bean of type 'repository.UserRepository' that could not be found.
The injection point has the following annotations:
- @org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'repository.UserRepository' in your configuration.
"
Solved it by put the repository files into a package with standardised naming convention:
e.g. com.app.Todo (for main domain files)
and
com.app.Todo.repository (for repository files)
That way, spring knows where to go looking for the repositories, else things get confusing really fast. :)
Hope this helps.
回答13:
In @ComponentScan("org.pharmacy"), you are declaring org.pharmacy package.
But your components in com.pharmacy package.
回答14:
If you're facing this problem when unit testing with @DataJpaTest then you'll find the solution below.
Spring boot do not initialize @Repository beans for @DataJpaTest. So try one of the two fix below to have them available:
First
Use @SpringBootTest instead. But this will boot up the whole application context.
Second(Better solutions)
Import the specific repository you need, like below
@DataJpaTest
@Import(MyRepository.class)
public class MyRepositoryTest {
@Autowired
private MyRepository myRepository;
回答15:
I had a similar issue with Spring Data MongoDB: I had to add the package path to @EnableMongoRepositories
来源：https://stackoverflow.com/questions/29221645/cant-autowire-repository-annotated-interface-in-spring-boot