[英]UnsatisfiedDependencyException trying to configure a basic spring-boot project in eclipse
I'm trying to configure in eclipse (with STS) a basic spring-boot project where I want to define a controller class and an entity class to autowired in controller, but I'm getting an exception. I'm trying to configure in eclipse (with STS) a basic spring-boot project where I want to define a controller class and an entity class to autowired in controller, but I'm getting an exception. I've been trying to fix it but now I'm without ideas,can someone help me?我一直在尝试修复它,但现在我没有想法,有人可以帮助我吗?
All works fine (I can get an entity object in my controller and the http request " http://localhost:8080/index " return my view in a correct way)... until I define a construct in the "Entidad" class and I get the exception. All works fine (I can get an entity object in my controller and the http request " http://localhost:8080/index " return my view in a correct way)... until I define a construct in the "Entidad" class我得到了例外。
here my code: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);
}
}
package com.example.springMVC_ejemplo.controller;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import com.example.springMVC_ejemplo.model.Entidad;
@Controller
public class MyController {
List<Entidad> exampleEntityList = new ArrayList<>();
// inject via application.properties
@Value("${index.message}")
private String message;
@Autowired
private Entidad entidad;
@PostConstruct
private void initExampleEntityList() {
String nombre = entidad.getNombre();
System.out.println("Inicializando la lista de entidades de ejemplo");
}
@GetMapping(value= {"/","/index"})
public String main(Model model) {
model.addAttribute("message", message);
return "index";
}
}
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;
}
}
And the exception I get is: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.
Thanks in advance!提前致谢!
Your Entidad
should not be a @Service
.您的Entidad
不应该是@Service
。 (You get the exception because Spring doesn't know which Strings to pass into the constructor) (您会收到异常,因为 Spring 不知道要传递给构造函数的字符串)
Remove the annotation and do not @Autowire it into your @Controller.删除注释并且不要将其@Autowire 到您的@Controller 中。 It is a simple model object, after all.毕竟,它是一个简单的 model object。
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