Set*_*aja 3 java spring-data-jpa
我已经提到了许多与此类似的 stackoverflow 问题。我已尝试了提供的所有解决方案和建议。但由于未检测到 Repository 类的 @Autowired，无论其在 Boot 应用程序文件中的 @EnableJpaRepositories 中的定义如何，都会不断给出错误。我尝试过使用
@Configuration
@EnableAutoConfiguration
@ComponentScan("com.example.repository") as well in the Boot application class.
Nothing seems to resolve the error.
Desperately seeking help from anyone who can find out what am I doing wrong. Please help me out. I have been trying to find on the internet and tried on my own. But still no luck and I have not been patient for the past two days because of this.
I want to resolve this and get ready to get a job using spring-boot-starter-data-jpa in their project. So please help.
===============================================================================
enter code here
folder structure
src->main->java->com
- ApplicationDataSource.java
src->main->java->com->example->controller
- H2Controller.java
src->main->java->com->example->service
- H2Service.java
src->main->java->com->example->repository
- H2Repository.java
-------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>h2sample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>h2sample</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jdbc</artifactId>
<version>9.0.10</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>2.3.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.3.2.RELEASE</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.jolbox</groupId>
<artifactId>bonecp</artifactId>
<version>0.8.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
---------------------------------------------------
package com;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import com.example.repository.H2Repository;
import com.example.repository.City;
/*
* @Configuration
*
* @EnableAutoConfiguration
*
* @ComponentScan("com.example.h2sample")
*/
@SpringBootApplication(scanBasePackages= {"com.example.controller","com.example.service"})
@EnableJpaRepositories("com.example.repository")
public class H2sampleApplication {
public static void main(String[] args) {
SpringApplication.run(H2sampleApplication.class, args);
}
}
--------------------
package com.example.controller;
import org.springframework.http.ResponseEntity;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.beans.factory.annotation.Autowired;
import com.example.service.H2Service;
@RestController
public class H2Controller {
@Autowired
private H2Service h2service;
@GetMapping(value="/testh2")
public String testh2() {
return "Hi Test "+h2service.getH2Service();
}
}
-------------------------------------------
package com.example.service;
import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import com.example.repository.H2Repository;
import com.example.repository.City;
@Service
public class H2Service {
@Autowired
private H2Repository<City> h2repository;
public String getH2Service() {
System.out.println(h2repository.findAll());
return " from Service";
}
}
--------------------------------------
package com.example.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Component;
import java.util.List;
public interface H2Repository<City> extends CrudRepository<City, Long> {
public List<City> findAll();
}
-----------------------------------------
package com.example.repository;
import java.util.Objects;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "CITY")
public class City {
@Id
private Long id;
private String name;
private int population;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPopulation() {
return population;
}
public void setPopulation(int population) {
this.population = population;
}
}
===================================================================
server.servlet.context-path=/h2
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.url=jdbc:h2:./test-db
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.show-sql=true
Error
----
H2Sample\h2sample\target\classes started by Sethu in H:\H2Sample\h2sample)
2020-07-28 11:39:01.955 INFO 14236 --- [ main] com.H2sampleApplication : No active profile set, falling back to default profiles: default
2020-07-28 11:39:02.453 INFO 14236 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2020-07-28 11:39:02.511 INFO 14236 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 46ms. Found 1 JPA repository interfaces.
2020-07-28 11:39:03.610 INFO 14236 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-07-28 11:39:03.624 INFO 14236 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-07-28 11:39:03.624 INFO 14236 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-07-28 11:39:03.754 INFO 14236 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/h2] : Initializing Spring embedded WebApplicationContext
2020-07-28 11:39:03.755 INFO 14236 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1736 ms
2020-07-28 11:39:03.922 INFO 14236 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-07-28 11:39:04.047 INFO 14236 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-07-28 11:39:05.024 INFO 14236 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-07-28 11:39:05.072 INFO 14236 --- [ main] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.4.18.Final
2020-07-28 11:39:05.309 INFO 14236 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
2020-07-28 11:39:05.414 INFO 14236 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
Hibernate: drop table if exists city CASCADE
Hibernate: create table city (id bigint not null, name varchar(255), population integer not null, primary key (id))
2020-07-28 11:39:05.970 INFO 14236 --- [ main] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2020-07-28 11:39:05.980 INFO 14236 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2020-07-28 11:39:06.135 WARN 14236 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'h2Controller': Unsatisfied dependency expressed through field 'h2service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'h2Service': Unsatisfied dependency expressed through field 'h2repository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'h2Repository' defined in com.example.repository.H2Repository defined in @EnableJpaRepositories declared on H2sampleApplication: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class java.lang.Object
2020-07-28 11:39:06.136 INFO 14236 --- [ main] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2020-07-28 11:39:06.141 INFO 14236 --- [ main] .SchemaDropperImpl$DelayedDropActionImpl : HHH000477: Starting delayed evictData of schema as part of SessionFactory shut-down'
Hibernate: drop table if exists city CASCADE
2020-07-28 11:39:06.150 INFO 14236 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2020-07-28 11:39:06.188 INFO 14236 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
2020-07-28 11:39:06.194 INFO 14236 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2020-07-28 11:39:06.223 INFO 14236 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-07-28 11:39:06.255 ERROR 14236 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'h2Controller': Unsatisfied dependency expressed through field 'h2service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'h2Service': Unsatisfied dependency expressed through field 'h2repository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'h2Repository' defined in com.example.repository.H2Repository defined in @EnableJpaRepositories declared on H2sampleApplication: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class java.lang.Object
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1420) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
at com.H2sampleApplication.main(H2sampleApplication.java:28) [classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'h2Service': Unsatisfied dependency expressed through field 'h2repository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'h2Repository' defined in com.example.repository.H2Repository defined in @EnableJpaRepositories declared on H2sampleApplication: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class java.lang.Object
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1420) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframewo
小智 8
如果您的主类位于结构的顶部，则不需要组件扫描，也不需要
@Configuration
@EnableAutoConfiguration
@ComponentScan("com.example.repository") as well in the Boot application class.
只需要在主类中使用 @SpringBootApplication 即可。
这里不遵循 Spring 的默认结构
使用 @ComponentScan(basePackages = {"com.example"})
尝试下面的代码：
@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan(basePackages={"<base package name>"})
@EnableJpaRepositories(basePackages="<repository package name>")
@EnableTransactionManagement
@EntityScan(basePackages="<entity package name>")