Java 尝试在eclipse中配置基本spring启动项目时发生未满足的PendencyException异常

我正试图在eclipse（使用STS）中配置一个基本的spring引导项目，在该项目中，我想定义一个控制器类和一个实体类，以便在控制器中自动连接，但我遇到了一个异常。我一直想把它修好，但现在我没有主意了，有人能帮我吗

一切正常（我可以在控制器中获取实体对象，http请求“”以正确的方式返回我的视图）。。。直到我在“Entidad”类中定义一个构造并得到异常

这是我的代码：

package com.example.springMVC_ejemplo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringMvcBahiaProjectApplication {

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

}

---

我得到的例外是：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.6.RELEASE)

2020-04-07 20:26:57.072  INFO 18236 --- [           main] c.e.s.SpringMvcBahiaProjectApplication   : Starting SpringMvcBahiaProjectApplication on DESKTOP-40IFSQT with PID 18236 (C:\Users\ignac\OneDrive\Documentos\eclipse-workspace\springMVC_BahiaProject\target\classes started by ignac in C:\Users\ignac\OneDrive\Documentos\eclipse-workspace\springMVC_BahiaProject)
2020-04-07 20:26:57.075  INFO 18236 --- [           main] c.e.s.SpringMvcBahiaProjectApplication   : No active profile set, falling back to default profiles: default
2020-04-07 20:26:57.682  INFO 18236 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-04-07 20:26:57.689  INFO 18236 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-04-07 20:26:57.689  INFO 18236 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.33]
2020-04-07 20:26:57.742  INFO 18236 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-04-07 20:26:57.743  INFO 18236 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 639 ms
2020-04-07 20:26:57.777  WARN 18236 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myController': Unsatisfied dependency expressed through field 'entidad'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'entidad' defined in file [C:\Users\ignac\OneDrive\Documentos\eclipse-workspace\springMVC_BahiaProject\target\classes\com\example\springMVC_ejemplo\model\Entidad.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.String' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
2020-04-07 20:26:57.779  INFO 18236 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2020-04-07 20:26:57.787  INFO 18236 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-04-07 20:26:57.870 ERROR 18236 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Parameter 0 of constructor in com.example.springMVC_ejemplo.model.Entidad required a bean of type 'java.lang.String' 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 'java.lang.String' in your configuration.

---

提前谢谢

您的

实体不应是
@服务
。（由于Spring不知道将哪些字符串传递到构造函数中，因此会出现异常）

删除注释，不要将其@Autowire连接到@Controller中。毕竟，它是一个简单的模型对象。
您的
实体
不应该是
@服务
。（由于Spring不知道将哪些字符串传递到构造函数中，因此会出现异常）

删除注释，不要将其@Autowire连接到@Controller中。毕竟，它是一个简单的模型对象

从Entidad bean类中删除@Service
不向Entidad类添加参数构造函数，否则spring容器将无法实例化Entidad类或删除@Autowire
从Entidad bean类中删除@Service
不向Entidad类添加参数构造函数，否则spring容器将无法实例化Entidad类或删除@Autowire
所以，问题是我的方法是错误的，我不能在我的控制器中注入这种对象。。。谢谢。您通常会有存储库，然后从数据库中选择这些实体（只是一个示例）。因此，如果我最初的想法是在Entidad中创建一个方法来创建一个示例对象列表（不将这一责任交给控制器），那么最好只为此创建一个存储库，如果它只是“实践”的内存列表，您可以在\@控制器中创建它。或底层\@服务。但是，稍后在使用数据库时，您很可能会使用存储库/dao。因此，问题是我的方法是错误的，我无法将此类对象注入控制器中。。。谢谢。您通常会有存储库，然后从数据库中选择这些实体（只是一个示例）。因此，如果我最初的想法是在Entidad中创建一个方法来创建一个示例对象列表（不将这一责任交给控制器），那么最好只为此创建一个存储库，如果它只是“实践”的内存列表，您可以在\@控制器中创建它。或底层\@服务。但是，稍后在使用数据库时，很可能会使用存储库/dao。
package com.example.springMVC_ejemplo.model;

import org.springframework.stereotype.Service;

@Service
public class Entidad {

    private String nombre;
    private String atributo1;
    private String atributo2;

    private Entidad(String nombre, String atributo1, String atributo2) {
        super();
        this.nombre = nombre;
        this.atributo1 = atributo1;
        this.atributo2 = atributo2;
    }

    public String getNombre() {
        return nombre;
    }
    public void setNombre(String nombre) {
        this.nombre = nombre;
    }
    public String getAtributo1() {
        return atributo1;
    }
    public void setAtributo1(String atributo1) {
        this.atributo1 = atributo1;
    }
    public String getAtributo2() {
        return atributo2;
    }
    public void setAtributo2(String atributo2) {
        this.atributo2 = atributo2;
    }

}

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.6.RELEASE)

2020-04-07 20:26:57.072  INFO 18236 --- [           main] c.e.s.SpringMvcBahiaProjectApplication   : Starting SpringMvcBahiaProjectApplication on DESKTOP-40IFSQT with PID 18236 (C:\Users\ignac\OneDrive\Documentos\eclipse-workspace\springMVC_BahiaProject\target\classes started by ignac in C:\Users\ignac\OneDrive\Documentos\eclipse-workspace\springMVC_BahiaProject)
2020-04-07 20:26:57.075  INFO 18236 --- [           main] c.e.s.SpringMvcBahiaProjectApplication   : No active profile set, falling back to default profiles: default
2020-04-07 20:26:57.682  INFO 18236 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-04-07 20:26:57.689  INFO 18236 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-04-07 20:26:57.689  INFO 18236 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.33]
2020-04-07 20:26:57.742  INFO 18236 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-04-07 20:26:57.743  INFO 18236 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 639 ms
2020-04-07 20:26:57.777  WARN 18236 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myController': Unsatisfied dependency expressed through field 'entidad'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'entidad' defined in file [C:\Users\ignac\OneDrive\Documentos\eclipse-workspace\springMVC_BahiaProject\target\classes\com\example\springMVC_ejemplo\model\Entidad.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.String' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
2020-04-07 20:26:57.779  INFO 18236 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2020-04-07 20:26:57.787  INFO 18236 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-04-07 20:26:57.870 ERROR 18236 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Parameter 0 of constructor in com.example.springMVC_ejemplo.model.Entidad required a bean of type 'java.lang.String' 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 'java.lang.String' in your configuration.