Java “无法自动装配。没有类型的豆类......找到”与简单项目
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"Could not autowire. No beans of type... found" with Simple project
提问by IcedDante
I downloaded the simple JPA Spring Boot tutorialand it worked just fine. However, when I attempt to replicate this simple behavior in my own test project, I get a "could not autowire" error on the bean injection in my Application.demo() method that returns a CommandLineRunner. The project is so barebones I don't even know what to submit but here's the POM:
我下载了简单的JPA Spring Boot 教程，效果很好。但是，当我尝试在我自己的测试项目中复制这个简单的行为时，在返回 CommandLineRunner 的 Application.demo() 方法中的 bean 注入中出现“无法自动装配”错误。该项目是如此准系统，我什至不知道该提交什么，但这是 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>test</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
And the application.
和应用程序。
package com.example;
@SpringBootApplication
public class TestApplication {
public static void main(String[] args) {
SpringApplication.run(TestApplication.class, args);
}
@Bean
//errors with: "Could not autowire. No beans of 'SimpRepository' type found"
public CommandLineRunner demo(SimpRepository repository) {
return (args) -> {
};
}
}
And the Repository service:
和存储库服务：
package com.example;
public interface SimpRepository extends CrudRepository<Simp, Long> {
}
for the following entity:
对于以下实体：
package com.example;
@Entity
public class Simp {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String value;
public Simp(String value) {
this.value = value;
}
}
采纳答案by metacubed
A couple of possibilities here.
这里有几种可能性。
You need to add the @EnableJpaRepositories(basePackages = {"your.pkg.here"})to the TestApplication. This tells Spring Data to look for your repository classes under the specified package. If the repository package name is the same as the TestApplication, you can skip the basePackagespart.
您需要将@EnableJpaRepositories(basePackages = {"your.pkg.here"})加到TestApplication. 这告诉 Spring Data 在指定的包下查找您的存储库类。如果存储库包名称与 相同，则TestApplication可以跳过该basePackages部分。
Similarly, if your TestApplicationand SimpRepositoryare not in the same package, you need to add a @ComponentScanwith the list of all relevant packages.
同样，如果您的TestApplication和SimpRepository不在同一个包中，则需要添加@ComponentScan所有相关包的列表。
