SpringBoot 2 元素未绑定

Question

我有一个文件 application.yml 和我的 Spring Boot 应用程序，它不愿意运行。

根据日志，元素 [simulator.geo.b12,simulator.geo.b13,simulator.geo.b21,simulator.geo.c6,simulator.geo.host] 未绑定的原因。然而，这个属性是在 application.yml 中设置的，编译器甚至会返回它的值。

如果有人能帮我解决这个问题，我将不胜感激。

simulator:
    geo:
        host: http://localhost:8080/
        b12: http://localhost:8080/geo/b12
        b13: http://localhost:8080/geo/b13
        b21: http://localhost:8080/geo/b21
        c6: http://localhost:8080/geo/c6

和java类

@Getter
@Configuration
@ConfigurationProperties(prefix = "simulator",ignoreUnknownFields = false)
public class VendorSimulatorProperties {

    @Value("${simulator.geo.host:http://localhost:8080/}")
    private String initUrl;

    @Value("${simulator.geo.b12}")
    private String geoB12Url;

    @Value("${simulator.geo.b13}")
    private String geoB13Url;

    @Value("${simulator.geo.b21}")
    private String geoB21Url;

    @Value("${simulator.geo.c6}")
    private String geoC6Url;
}

当我开始运行应用程序时，我收到错误消息：

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

Description:

Binding to target [Bindable@1c140c7c type = com.mathartsys.dlc.thirdparty.vendor.config.VendorSimulatorProperties$$EnhancerBySpringCGLIB$$eb0a550b, value = 'provided', annotations = array<Annotation>[@org.springframework.boot.context.properties.ConfigurationProperties(prefix=simulator, value=simulator, ignoreUnknownFields=false, ignoreInvalidFields=false)]] failed:

    Property: simulator.geo.b12
    Value: http://localhost:8080/geo/b12
    Origin: class path resource [config/application-dev.yml]:204:14
    Reason: The elements [simulator.geo.b12,simulator.geo.b13,simulator.geo.b21,simulator.geo.c6,simulator.geo.host] were left unbound.
    Property: simulator.geo.b13
    Value: http://localhost:8080/geo/b13
    Origin: class path resource [config/application-dev.yml]:205:14
    Reason: The elements [simulator.geo.b12,simulator.geo.b13,simulator.geo.b21,simulator.geo.c6,simulator.geo.host] were left unbound.
    Property: simulator.geo.b21
    Value: http://localhost:8080/geo/b21
    Origin: class path resource [config/application-dev.yml]:206:14
    Reason: The elements [simulator.geo.b12,simulator.geo.b13,simulator.geo.b21,simulator.geo.c6,simulator.geo.host] were left unbound.
    Property: simulator.geo.c6
    Value: http://localhost:8080/geo/c6
    Origin: class path resource [config/application-dev.yml]:207:13
    Reason: The elements [simulator.geo.b12,simulator.geo.b13,simulator.geo.b21,simulator.geo.c6,simulator.geo.host] were left unbound.
    Property: simulator.geo.host
    Value: http://localhost:8080/
    Origin: class path resource [config/application-dev.yml]:203:15
    Reason: The elements [simulator.geo.b12,simulator.geo.b13,simulator.geo.b21,simulator.geo.c6,simulator.geo.host] were left unbound.

这个问题困扰了我很久，希望有人能给我一些建议；我使用了 springboot 2.0 谢谢

Answer 1

我遇到了同样的问题，但就我而言，这是因为我添加了@AllArgsConstructor但没有添加@NoArgsConstructor. 结果，Spring 无法创建配置对象（使用默认构造函数），因此它只是跳过处理配置并打印出警告。

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor // need to add this if you have @AllArgsConstructor
public class ServerConfiguration {
    private String host;
    private int port;
}

Answer 2

问题是您@ConfigurationProperties以错误的方式使用了。您使用其中之一@ConfigurationProperties或@Value但不使用两者。

该解决方案要么修复您的类以用于@ConfigurationProperties或删除@ConfigurationProperties注释。

@Getter
@Setter
@Component
@ConfigurationProperties(prefix = "simulator.geo",ignoreUnknownFields = false)
public class VendorSimulatorProperties {

    private String host = "http://localhost:8080/";
    private String b12;
    private String b13;
    private String b21;
    private String c6;

}

您需要修复prefix它应该是的，simulator.geo并且您的属性应该以文件中的键命名。您还需要 getter 旁边的 setter。但是，这还需要更改其余配置，以使用新生成的 getter。

对您来说，删除可能更容易，@ConfigurationProperties因为您一开始并没有真正使用它们。