错误：字段需要无法找到的bean类型。考虑定义一个bean

时间：2018-01-26 17:13:10

标签： spring spring-boot spring-data spring-data-jpa

在Spring boot 1.5.9上创建Spring启动应用程序时，我收到以下错误消息。有人可以帮忙吗？提前谢谢。

  .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v1.5.9.RELEASE)

    2018-01-26 22:16:01.534  INFO 7176 --- [           main] com.myapp.MyAppApplication               : Starting MyAppApplication on DESKTOP-29H8ALN with PID 7176 (F:\My_SpringBoot_WorkSpace_20_01_2018\MyApp\MyApp\target\classes started by Tanmoy in F:\My_SpringBoot_WorkSpace_20_01_2018\MyApp\MyApp)
    2018-01-26 22:16:01.534  INFO 7176 --- [           main] com.myapp.MyAppApplication               : No active profile set, falling back to default profiles: default
    2018-01-26 22:16:01.590  INFO 7176 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@61009542: startup date [Fri Jan 26 22:16:01 IST 2018]; root of context hierarchy
    2018-01-26 22:16:02.889  INFO 7176 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 9001 (http)
    2018-01-26 22:16:02.903  INFO 7176 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    2018-01-26 22:16:02.904  INFO 7176 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.23
    2018-01-26 22:16:03.075  INFO 7176 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    2018-01-26 22:16:03.075  INFO 7176 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1490 ms
    2018-01-26 22:16:03.238  INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
    2018-01-26 22:16:03.242  INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
    2018-01-26 22:16:03.243  INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
    2018-01-26 22:16:03.243  INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
    2018-01-26 22:16:03.243  INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
    2018-01-26 22:16:03.277  WARN 7176 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'customerController': Unsatisfied dependency expressed through field 'customerService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'customerService': Unsatisfied dependency expressed through field 'customersRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.myapp.repository.CustomersRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    2018-01-26 22:16:03.278  INFO 7176 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
    2018-01-26 22:16:03.311  INFO 7176 --- [           main] utoConfigurationReportLoggingInitializer : 

    Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
    2018-01-26 22:16:03.396 ERROR 7176 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

    ***************************
    APPLICATION FAILED TO START
    ***************************

    Description:

    Field customersRepository in com.myapp.service.CustomerService required a bean of type 'com.myapp.repository.CustomersRepository' that could not be found.


    Action:

    Consider defining a bean of type 'com.myapp.repository.CustomersRepository' in your configuration.

我正在使用此设置：

  1. Spring Boot 1.5.9

  2. Oracle 11g数据库。

    3. 请找到我正在使用的以下类和pom.xml：

    <?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.tanmoy</groupId>
    <artifactId>MyApp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>MyApp</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>hibernate-entitymanager</artifactId>
                    <groupId>org.hibernate</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>12.1.0.1</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

    Java代码 - 应用程序：

    package com.myapp;

import javax.transaction.Transactional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

import com.myapp.entity.Customers;
import com.myapp.repository.CustomersRepository;
import com.myapp.service.CustomerService;

@SpringBootApplication
public class MyAppApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyAppApplication.class, args);

    }

    @Bean
    public CommandLineRunner demo(CustomersRepository repository) {

        return (args) -> {

            // fetch all customers

            for (Customers customer : repository.findAll()) {

            }

        };

    }

}

    Java代码 - 存储库：

    package com.myapp.repository;

import java.util.List;

import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

import com.myapp.entity.Customers;

@Repository
public interface CustomersRepository extends CrudRepository<Customers, Integer> {

    @Query("select * from customers")
    public List<Customers> getAllCustomerts();

}

    Java代码 - 服务：

    package com.myapp.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.myapp.repository.CustomersRepository;

@Service
public class CustomerService {

    @Autowired
    CustomersRepository customersRepository;

    public void getAllCustomers() {
        System.out.println(customersRepository.findAll());
    }

}

4 个答案:

答案 0 :(得分：0)

从@Repository删除CustomersRepository注释。

接口CrudRepository已经在Spring的容器中注册，它可以注入（也是它的子接口）。

答案 1 :(得分：0)

我认为异常堆栈跟踪中有更多内容未共享，我认为异常将指向不正确的查询。 CustomersRespository中的查询应如下所示：

@Query("select c from Customers c")
public List<Customers> getAllCustomerts();

答案 2 :(得分：0)

如果您从未使用过它，为什么要在存储库中定义getAllCustomers？ CrudRepository已经为您提供了一些有用的方法实现，而不必在接口声明之外编写一行代码。 我的建议是删除存储库中的getAllCustumers并从服务中调用存储库中的findAll。

答案 3 :(得分：-1)

@Autowired
CustomersRepository customersRepository;

这不是Autowire的正确方法。这是：

CustomersRepository customersRepository;

@Autowire
public defaultConstructor(CustomerRepository customerRepository){
this.customerRepository = customerRepository;
}

注意： defaultConstructor只是您的类名（默认构造函数）。

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