SpringBoot BeanCreationException：创建名为“requestMappingHandlerAdapter”的 bean 时出错 原因：java.lang.NoSuchFieldError：defaultInstance
[英]SpringBoot BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' Caused by: java.lang.NoSuchFieldError: defaultInstance
问题描述
I have a SpringBoot + Maven project with JPA. When tring to run the application I got the following error stack.
我有一个带有 JPA 的 SpringBoot + Maven 项目。当尝试运行该应用程序时，我得到以下错误堆栈。
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed;
Below is my pom.xml file.下面是我的 pom.xml 文件。
<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>2.3.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.demo</groupId>
<artifactId>docker-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>docker-example</name>
<description>Docker Example</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.18</version>
</dependency>
</dependencies>
<build>
<finalName>app</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Any idea of how to fix this?知道如何解决这个问题吗？
2 个解决方案
解决方案1
5 2020-11-05 10:32:00
The problem described is related to conflicts between different Maven dependencies.描述的问题与不同的 Maven 依赖之间的冲突有关。 I've had the same problem while trying to use the latest version of Spring Boot with Apache Camel.我在尝试将最新版本的 Spring Boot 与 Apache Camel 一起使用时遇到了同样的问题。
After analyzing the dependency tree, it turned out that the version of spring-webmvc was 5.2.9, while all other spring dependencies were of version 5.2.8.分析依赖树后发现spring-webmvc的版本是5.2.9，而其他spring个依赖都是5.2.8版本。
In my case, I have solved the problem by using a newer version of camel-spring-boot-dependencies (3.6.0, unlike previously used 3.5.0).就我而言，我已经通过使用更新版本的 camel-spring-boot-dependencies（3.6.0，与之前使用的 3.5.0 不同）解决了这个问题。
解决方案2
3 2020-09-22 09:29:25
Found the solution.找到了解决方案。
In my pom.xml there were two dependencies like在我的 pom.xml 中有两个依赖项，例如
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
What I did was removed the spring-web dependency and reloaded all Maven Plugins and tried running the project again.我所做的是删除spring-web依赖项并重新加载所有 Maven 插件并尝试再次运行该项目。
It was successful.它是成功的。
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