Spring boot 春天假装和哈特奥斯在一起

我了解更多关于云的spring boot。 当我没有假装依赖pom.xml时，一切都很好。在此之前，应用程序启动开始失败，最初，RelProvider不能为null！当我提供linkRelProvider给Dependency时。它尚未在MessageResolver上开始失败

例外情况：

Caused by: java.lang.IllegalArgumentException: MessageResolver must not be null!
    at org.springframework.util.Assert.notNull(Assert.java:198) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE]
    at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalLinkListSerializer.<init>(Jackson2HalModule.java:131) ~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
    at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalLinkListSerializer.<init>(Jackson2HalModule.java:121) ~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
    at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalHandlerInstantiator.<init>(Jackson2HalModule.java:753) ~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
    at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalHandlerInstantiator.<init>(Jackson2HalModule.java:738) ~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
    at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalHandlerInstantiator.<init>(Jackson2HalModule.java:722) ~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
    at org.springframework.cloud.openfeign.hateoas.FeignHalAutoConfiguration.halJacksonHttpMessageConverter(FeignHalAutoConfiguration.java:80) ~[spring-cloud-openfeign-core-2.2.1.RELEASE.jar:2.2.1.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_231]

原因：java.lang.IllegalArgumentException:MessageResolver不能为null！
在org.springframework.util.Assert.notNull（Assert.java:198）~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE]
在org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalLinkListSerializer.（Jackson2HalModule.java:131）~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
在org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalLinkListSerializer.（Jackson2HalModule.java:121）~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
位于org.springframework.hateoas.mediatype.hal.Jackson2HalModule$halhandler实例化器（Jackson2HalModule.java:753）~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
位于org.springframework.hateoas.mediatype.hal.Jackson2HalModule$halhandler实例化器（Jackson2HalModule.java:738）~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
位于org.springframework.hateoas.mediatype.hal.Jackson2HalModule$halhandler实例化器（Jackson2HalModule.java:722）~[spring-hateoas-1.0.3.RELEASE.jar:1.0.3.RELEASE]
在org.springframework.cloud.openfeign.hateoas.FeignHalAutoConfiguration.halJacksonHttpMessageConverter（FeignHalAutoConfiguration.java:80）~[spring-cloud-openfeign-core-2.2.1.RELEASE.jar:2.2.1.RELEASE]
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）~[na:1.8.0\u 231]

FaignHalAutoConfiguration设置了所需的依赖项，该依赖项还需要消息解析器，我正在努力弄清楚这一点

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.test.spring</groupId>
    <artifactId>spring-examples</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-examples</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR1</spring-cloud.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-hateoas</artifactId>
        </dependency>

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

        <!-- <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency> -->

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!-- <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-rest-hal-browser</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.plugin</groupId>
                    <artifactId>spring-plugin-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency> -->

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.6.1</version>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.6.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

</project>

4.0.0
org.springframework.boot
spring启动程序父级
2.2.4.1发布
com.test.spring
春天的例子
0.0.1-快照
春天的例子
SpringBoot的演示项目
1.8
Hoxton.SR1
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
弹簧靴启动器hateoas
org.springframework.boot
弹簧靴起动器执行器
org.springframework.cloud
SpringCloudStarter配置
org.springframework.cloud
春季云启动程序
伊奥·斯普林福克斯
springfox-Swagger 2
2.6.1
伊奥·斯普林福克斯
springfox招摇过市用户界面
2.6.1
org.springframework.boot
弹簧靴开发工具
运行时
真的
org.springframework.boot
弹簧起动试验
测试
org.springframework.cloud
spring云依赖关系
${spring cloud.version}
聚甲醛
进口
org.springframework.boot
springbootmaven插件

appConfig.java

package com.test.spring.springexamples;

import java.util.ArrayList;
import java.util.List;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.hateoas.client.LinkDiscoverer;
import org.springframework.hateoas.client.LinkDiscoverers;
import org.springframework.hateoas.mediatype.collectionjson.CollectionJsonLinkDiscoverer;
import org.springframework.hateoas.server.LinkRelationProvider;
import org.springframework.hateoas.server.core.AnnotationLinkRelationProvider;
import org.springframework.plugin.core.SimplePluginRegistry;

import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class AppConfig {

    @Bean
    public ResourceBundleMessageSource messageSource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        messageSource.setBasename("message");
        return messageSource;
    }

    @Bean
    public Docket docket() {
        return new Docket(DocumentationType.SWAGGER_2);
    }

    @Bean
    public LinkDiscoverers discoverers() {
        List<LinkDiscoverer> plugins = new ArrayList<>();
        plugins.add(new CollectionJsonLinkDiscoverer());
        return new LinkDiscoverers(SimplePluginRegistry.create(plugins));

    }

    @Bean
    public LinkRelationProvider linkRelationProvider() {
        return new AnnotationLinkRelationProvider();
    }

}

package com.test.spring.springexamples；
导入java.util.ArrayList；
导入java.util.List；
导入org.springframework.context.annotation.Bean；
导入org.springframework.context.annotation.Configuration；
导入org.springframework.context.support.ResourceBundleMessageSource；
导入org.springframework.hateoas.client.LinkDiscoverer；
导入org.springframework.hateoas.client.LinkDiscoverers；
导入org.springframework.hateoas.mediatype.collectionjson.CollectionJsonLinkDiscoverer；
导入org.springframework.hateoas.server.LinkRelationProvider；
导入org.springframework.hateoas.server.core.AnnotationLinkRelationProvider；
导入org.springframework.plugin.core.SimplePluginRegistry；
导入springfox.documentation.spi.DocumentationType；
导入springfox.documentation.spring.web.plugins.Docket；
导入springfox.documentation.swagger 2.annotations.enableSawagger 2；
@配置
@使能招摇过市2
公共类AppConfig{
@豆子
公共资源BundleMessageSource messageSource（）{
ResourceBundleMessageSource=新建ResourceBundleMessageSource（）；
messageSource.setBasename（“消息”）；
返回消息源；
}
@豆子
公开摘要{
返回新的摘要（DocumentationType.SWAGGER_2）；
}
@豆子
公共链接发现者发现者（）{
List plugins=new ArrayList（）；
add（新集合jsonlinkdiscoverer（））；
返回新的LinkDiscoverers（SimplePluginRegistry.create（plugins））；
}
@豆子
公共LinkRelationProvider LinkRelationProvider（）{
返回新的AnnotationLinkRelationProvider（）；
}
}

---

请告知我这里做错了什么。

如果将

debug=true

添加到application.properties，您将在报告中看到

   HypermediaAutoConfiguration.HypermediaConfiguration:
      Did not match:
         - @ConditionalOnMissingBean (types: org.springframework.hateoas.client.LinkDiscoverers; SearchStrategy: all) found beans of type 'org.springframework.hateoas.client.LinkDiscoverers' discoverers (OnBeanCondition)
      Matched:
         - @ConditionalOnClass found required class 'com.fasterxml.jackson.databind.ObjectMapper' (OnClassCondition)

由于您的自定义

LinkDiscoverers

bean，超媒体配置

将退出

要么删除该bean定义，要么添加

@EnableHypermediaSupport(type = EnableHypermediaSupport.HypermediaType.HAL)

在应用程序类上。
如果将
debug=true
添加到application.properties，您将在报告中看到

   HypermediaAutoConfiguration.HypermediaConfiguration:
      Did not match:
         - @ConditionalOnMissingBean (types: org.springframework.hateoas.client.LinkDiscoverers; SearchStrategy: all) found beans of type 'org.springframework.hateoas.client.LinkDiscoverers' discoverers (OnBeanCondition)
      Matched:
         - @ConditionalOnClass found required class 'com.fasterxml.jackson.databind.ObjectMapper' (OnClassCondition)

由于您的自定义
LinkDiscoverers
bean，超媒体配置
将退出

要么删除该bean定义，要么添加

@EnableHypermediaSupport(type = EnableHypermediaSupport.HypermediaType.HAL)

关于你的申请课程。
嗨，谢谢你的回复。我删除了linkdiscoverersbean，但它仍然不起作用。带着这个我回到了我开始的地方。错误：由以下原因引起：java.lang.IllegalArgumentException:RelProvider不能为null！在org.springframework.util.Assert.notNull（Assert.java:198）~[spring-core-5.2.3.RELEASE.ja