将 Spring Boot 版本从 2.0.3.RELEASE 更改为 2.1.0.M4 时出现问题
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【中文标题】将 Spring Boot 版本从 2.0.3.RELEASE 更改为 2.1.0.M4 时出现问题【英文标题】：Trouble when changing Spring Boot version from 2.0.3.RELEASE to 2.1.0.M4 【发布时间】：2019-03-27 16:15:24 【问题描述】：当我将 Spring Boot 版本从 2.0.3.RELEASE 更改为 2.1.0.M4 时，我的工作代码停止工作
错误是：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
***************************
APPLICATION FAILED TO START
***************************
Description:
The bean 'dataSource', defined in BeanDefinition defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class] and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
已经提出了一个类似的问题 (Trouble when changing Spring Boot version from 2.0.3.RELEASE to 2.1.0.BUILD-SNAPSHOT)，但没有给出正确答案。
以下是我的 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>
<parent>
<groupId>***.***.***</groupId>
<artifactId>******</artifactId>
<version>1.0.0</version>
<relativePath />
<!-- lookup parent from repository -->
</parent>
<artifactId>*****</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>$project.artifactId</name>
<description>TEST</description>
<prerequisites>
<maven>$maven.version</maven>
</prerequisites>
<properties>
<start-class>c*.*.Application</start-class>
<junit.jupiter.version>5.2.0</junit.jupiter.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-reactor-netty -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-reactor-netty</artifactId>
<version>2.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-rsa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- Sql server driver -->
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>mssql-jdbc</artifactId>
</dependency>
<!-- Lombok dependencies -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<!-- Commons dependencies -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>commons-validator</groupId>
<artifactId>commons-validator</artifactId>
</dependency>
<!-- Logging dependencies -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-sleuth</artifactId>
</dependency>
<dependency>
<groupId>net.logstash.logback</groupId>
<artifactId>logstash-logback-encoder</artifactId>
</dependency>
<!-- Swagger dependencies -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-bean-validators</artifactId>
</dependency>
<!-- Test dependencies -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>com.vaadin.external.google</groupId>
<artifactId>android-json</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Spring REST Docs dependencies -->
<dependency>
<groupId>org.springframework.restdocs</groupId>
<artifactId>spring-restdocs-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.restdocs</groupId>
<artifactId>spring-restdocs-webtestclient</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.restdocs</groupId>
<artifactId>spring-restdocs-asciidoctor</artifactId>
<scope>test</scope>
</dependency>
<!-- Spring Auto REST Docs dependencies -->
<dependency>
<groupId>capital.scalable</groupId>
<artifactId>spring-auto-restdocs-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>test</scope>
</dependency>
<!-- JUnit Jupiter API and Engine -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>$junit.jupiter.version</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>$junit.jupiter.version</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.squareup.okhttp3/mockwebserver -->
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>mockwebserver</artifactId>
<version>3.10.0</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.projectreactor/reactor-test -->
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<version>3.1.8.RELEASE</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mock-server</groupId>
<artifactId>mockserver-netty</artifactId>
<version>5.4.1</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<filtering>true</filtering>
<directory>src/main/resources</directory>
<includes>
<include>**/*.xml</include>
<include>**/*.properties</include>
<include>**/*.yml</include>
</includes>
<excludes>
<exclude>**/*.jks</exclude>
</excludes>
</resource>
<resource>
<filtering>false</filtering>
<directory>src/main/resources</directory>
<includes>
<include>**/*.jks</include>
</includes>
<excludes>
<exclude>**/*.xml</exclude>
<exclude>**/*.properties</exclude>
<exclude>**/*.yml</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>com.github.ekryd.sortpom</groupId>
<artifactId>sortpom-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>com.github.spotbugs</groupId>
<artifactId>spotbugs-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<configuration>
<excludeFromFailureFile>$project.basedir/exclude-pmd.properties</excludeFromFailureFile>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.asciidoctor</groupId>
<artifactId>asciidoctor-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
</plugin>
<plugin>
<groupId>org.gaul</groupId>
<artifactId>modernizer-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>pl.project13.maven</groupId>
<artifactId>git-commit-id-plugin</artifactId>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>dev</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<spring.profiles.active>dev</spring.profiles.active>
</properties>
</profile>
<profile>
<id>qa</id>
<properties>
<spring.profiles.active>qa</spring.profiles.active>
</properties>
</profile>
<profile>
<id>prod</id>
<properties>
<spring.profiles.active>prod</spring.profiles.active>
</properties>
</profile>
<profile>
<id>eclipse</id>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>$junit.jupiter.version</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-launcher</artifactId>
<version>1.1.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-launcher</artifactId>
</dependency>
</dependencies>
</profile>
</profiles>
</project>
我在几个部分上打了星号。 父 BOM 在其 POM 中有一个 parent 元素，如下所示：
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.M4</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
进展
从 spring 2.1.0 M1 发行说明 (https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.1.0-M1-Release-Notes) 我看到 Bean Overriding 已被禁用。
当我在 application.yml 文件中添加属性 allow-bean-definition-overriding: true 时错误消失，但随后出现以下错误：
java.lang.ClassNotFoundException: reactor.netty.http.client.HttpClient
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 115 common frames omitted
Wrapped by: java.lang.NoClassDefFoundError: reactor/netty/http/client/HttpClient
... 115 common frames omitted
Wrapped by: java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError: reactor/netty/http/client/HttpClient
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [9 skipped]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
【问题讨论】：
【参考方案1】：您的应用程序似乎混合了两个不兼容的 Spring Boot 版本。
您的主要pom.xml 似乎正在使用2.0.5.RELEASE 版本导入spring-boot-starter-reactor-netty。
-
您不应该覆盖 Spring Boot 库的版本，因为这一切都由父 POM 中的依赖管理来处理
您根本不需要 reactor-netty 启动器，因为它是由 webflux 传递的。
【讨论】：
标记为正确答案。现在，我在 jpa 测试类上使用了两个注释：“@DataJpaTest”和“@SpringBootTest”。这两个注释都带有“@BootStrapWith”注释，我得到一个多重引导注释错误。你能告诉我如何解决这个问题吗？ 您不应该同时使用这两个注释。如果您想了解更多信息，请创建一个包含更多详细信息的新问题。 完成。这是链接：***.com/questions/52966139/…【参考方案2】：一旦您的项目处于开发阶段，请不要更改 Spring Boot 版本。开始项目时尝试添加最新版本。一旦开发开始，不要更改版本中的任何内容。我遇到了同样的问题，浪费了 4-5 个小时，然后又回到以前的版本，一切正常。
删除.project文件并更新maven。
【讨论】：
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