[英]Unsatisfied dependency expressed through field 'userRepository'
Can't solve problems with test Spring Boot application:无法解决测试 Spring Boot 应用程序的问题:
spring.bat init --artifactId=dbproto3 --boot-version=2.1.7.RELEASE --dependencies=jdbc,data-rest,web,thymeleaf,devtools,lombok,configuration-processor,security,data-jpa,data-jdbc,postgresql,actuator --description=dbproto3 --groupId=com.test --java-version=11 --name=dbproto3 --package-name=com.test.dbproto3 --version=0.0.1-SNAPSHOT
It is a test application made by modifying Guide "Accessing data with MySQL" from official Spring site.它是通过修改 Spring 官方网站的“Accessing data with MySQL”指南制作的测试应用程序。 The first version (close to initial: empty springconfig, @Controller and @RequestMapping(path="/demo"), ...) worked great but my version generates an exception
第一个版本(接近初始:空 springconfig、@Controller 和 @RequestMapping(path="/demo"), ...)效果很好,但我的版本产生了异常
Running it i get an exception:运行它我得到一个例外:
Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException
2 . at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
3 . at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
4 . at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
5 . at java.base/java.lang.reflect.Method.invoke(Method.java:566)
6 . at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
7 . Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mainController': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.test.dbproto3.UserRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
8 . at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
9 . at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
10 . at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
11 . at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)
12 . at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
13 . at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
14 . at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
15 . at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
16 . at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
17 . at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
18 . at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
19 . at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
20 . at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
21 . at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:88)
22 . at com.test.dbproto3.Dbproto3Application.main(Dbproto3Application.java:18)
23 . ... 5 more
24 . Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.test.dbproto3.UserRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
25 . at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1658)
26 . at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1217)
27 . at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1171)
28 . at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
29 . ... 19 more
Dbproto3Application: Dbproto3应用程序:
@SpringBootApplication
2 . public class Dbproto3Application {
3 .
4 . public static void main(String[] args) {
5 . SpringApplication.run(Dbproto3Application.class, args);
6 .
7 . ApplicationContext javaConfigContext = new AnnotationConfigApplicationContext(SpringConfig.class);
8 .
9 . MainController mainControllerObj = (MainController) javaConfigContext.getBean("mainController");
10 .
11 . mainControllerObj.addNewUser();
12 . }
13 . }
SpringConfig:弹簧配置:
1 . @Configuration
2 . public class SpringConfig {
3 . @Bean("mainController")
4 . public MainController createMainController() {
5 . return new MainController();
6 . }
7 . }
User:用户:
1 . @Entity
2 . @Table(name = "userstab")
3 . public class User {
4 . @Id
5 . @GeneratedValue(strategy=GenerationType.AUTO)
6 . private Integer id;
7 .
8 . private String name;
9 .
10 . private String email;
11 .
12 . }
UserRepository:用户库:
1 . public interface UserRepository extends CrudRepository<User, Integer> {
2 .
3 . }
MainController:主控制器:
3 . public class MainController {
4 .
5 . @Autowired
6 . private UserRepository userRepository;
7 .
8 .
9 . public void addNewUser() {
10 . User n = new User();
11 . n.setName("testuser");
12 . n.setEmail("testemail");
13 . System.out.println("addNewUser()");
14 . userRepository.save(n);
15 . }
16 .
17 . }
application properties:应用特性:
server.port = 8082
## default connection pool
spring.datasource.hikari.connectionTimeout=20000
spring.datasource.hikari.maximumPoolSize=5
## PostgreSQL
spring.datasource.url=jdbc:postgresql://localhost:5432/example_db
spring.datasource.username=someuser
spring.datasource.password=123456
spring.jpa.hibernate.ddl-auto=update
I could not see any annotations for your repository interface in the code that you shared .Even though you are extending the CrudRepository
interface to create your own interface.我在您共享的代码中看不到您的存储库接口的任何注释。即使您正在扩展
CrudRepository
接口以创建您自己的接口。 Spring boot needs to understand during startup that it needs to provide default implementation for your entities.Use annotation @Repository
on your interface like : Spring boot 需要在启动期间了解它需要为您的实体提供默认实现。在您的界面上使用注释
@Repository
,例如:
@Repository
public interface UserRepository extends CrudRepository<User, Integer> {
}
Also, you are creating the controller bean in some weird way , so you might be attempting something unconventional which means just using @Autowired
in your main application class might also be a bit of stretch for you.此外,您正在以某种奇怪的方式创建控制器 bean,因此您可能正在尝试一些非常规的东西,这意味着仅在您的主应用程序类中使用
@Autowired
对您来说也可能有点牵强。 But i would suggest doing that.但我会建议这样做。 You are using
AnnotationConfigApplicationContext
to create the bean for your controller but you are only providing the configuration class that you created for scanning.您正在使用
AnnotationConfigApplicationContext
为您的控制器创建 bean,但您只提供您为扫描创建的配置类。 Maybe the bean for UserRepository since it's getting created by springboot is not present in the application context that you created using AnnotationConfigApplicationContext
.也许 UserRepository 的 bean 因为它是由 springboot 创建的,所以在您使用
AnnotationConfigApplicationContext
创建的应用程序上下文中不存在。 I think it's a standalone context.我认为这是一个独立的上下文。
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