我正在从的教程中学习Java spring Boot
我一直得到"；api.dataBase.basic.apiDatabase.Models.TopicService中的字段topicRepository需要一个类型为"api.dataBase.basic.apiDatabase.Interface.topicRepository"的bean，但找不到该bean">
我读到这个错误可能是因为componentScan由于类的注释不好或包布局不好而失败。
我的java包的布局
我的项目布局
我的课程如下：；
package api.dataBase.basic.apiDatabase;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication ()
public class ApiDatabaseApplication {
public static void main(String[] args) {
SpringApplication.run(ApiDatabaseApplication.class, args);
}
}
Topic.java
package api.dataBase.basic.apiDatabase.Models;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Topic {
@Id
private String id;
private String name;
private String description;
//private Address address;
public Topic(final String id, final String name, final String description) {
this.id = id;
this.name = name;
this.description = description;
}
public Topic() {
}
@Id
public String getId() {
return id;
}
public void setId(final String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(final String description) {
this.description = description;
}
}
TopicRepository.java
package api.dataBase.basic.apiDatabase.Interface;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import api.dataBase.basic.apiDatabase.Models.Topic;
@Repository
public interface TopicRepository extends CrudRepository <Topic, String>{
}
TopicService.java
package api.dataBase.basic.apiDatabase.Models;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import api.dataBase.basic.apiDatabase.Interface.TopicRepository;
@Service
public class TopicService {
@Autowired
private TopicRepository topicRepository;
private List<Topic> Oldtopics = new ArrayList<>(Arrays.asList(
new Topic("1001", "test", "hello 1"),
new Topic("1002", "hello", "hello 2")
));
public List<Topic> getTopics() {
List<Topic> topics = new ArrayList<>();
topicRepository.findAll().forEach(topics::add);
return topics;
}
public Topic getTopic(String id) {
return Oldtopics.stream().filter(t -> t.getId().equals(id)).findFirst().get();
}
public void addTopic(final Topic topic) {
topicRepository.save(topic);
}
public void updateTopic(final Topic topic, final String id) {
for (int i = 0; i < Oldtopics.size(); i++) {
if (Oldtopics.get(i).getId().equals(id)) {
Oldtopics.set(i, topic);
return;
}
}
}
public void deleteTopic(String id) {
Oldtopics.removeIf(t -> t.getId().equals(id));
}
public void deleteTopic(final String[] id) {
for (int i = 0; i < Oldtopics.size(); i++) {
for (String ids : id) {
if (Oldtopics.get(i).getId().equals(ids)) {
Oldtopics.remove(i);
}
}
}
}
}
任何帮助都将不胜感激。
完整堆栈跟踪。
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-11-21 19:18:05.350 ERROR 4192 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field topicRepository in api.dataBase.basic.apiDatabase.Models.TopicService required a bean of type 'api.dataBase.basic.apiDatabase.Interface.TopicRepository' 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 'api.dataBase.basic.apiDatabase.Interface.TopicRepository' in your configuration.
POM:
<?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>2.2.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>api.dataBase.basic</groupId>
<artifactId>apiDatabase</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>apiDatabase</name>
<description>API project with JPA database</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
</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>
这可能是错过配置，从而导致组件扫描混乱的情况。
我建议您应该将带有以下内容的"Config.java"添加到源根(src/main/java(中
@Configuration
@EnableJpaRepositories
class Config {
}