java - Spring 启动: IllegalStateException:Duplicate fragment name spring_web

Question

在 Spring Boot 应用程序中面临 IllegalStateException:重复的片段名称 spring_web。 浏览了几篇文章，但每个人都建议与 web.xml 相关的解决方案。但在 Spring Boot 中我们没有 web.xml 。 Spring Boot 中最好的解决方案是什么？ 对于我的组织，我们需要在 war 包中构建应用程序。在 eclipse 中执行时一切都很好。但是当尝试在外部 tomcat 9 服务器中部署时，我们遇到了这个问题。

这是我的 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 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>2.1.8.RELEASE</version>
  <relativePath />
  <!-- lookup parent from repository -->
</parent>
<groupId>com.xyz</groupId>
<artifactId>appname</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>appname</name>
<packaging>war</packaging>
<description>Demo project for Spring Boot</description>
<properties>
  <java.version>1.8</java.version>
</properties>
<dependencies>
  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
     <exclusions>
        <exclusion>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
     </exclusions>
  </dependency>
  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter</artifactId>
     <exclusions>
        <exclusion>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
     </exclusions>
  </dependency>
  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-log4j2</artifactId>
  </dependency>
  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-test</artifactId>
     <scope>test</scope>
  </dependency>
  <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-jdbc</artifactId>
     <version>5.1.9.RELEASE</version>
  </dependency>
  <dependency>
     <groupId>log4j</groupId>
     <artifactId>log4j</artifactId>
     <version>1.2.17</version>
  </dependency>
  <!-- exclude tomcat jdbc connection pool, use HikariCP -->
  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-jdbc</artifactId>
     <exclusions>
        <exclusion>
           <groupId>org.apache.tomcat</groupId>
           <artifactId>tomcat-jdbc</artifactId>
        </exclusion>
     </exclusions>
  </dependency>
  <!-- exclude tomcat-jdbc, Spring Boot will use HikariCP automatically -->
  <dependency>
     <groupId>com.zaxxer</groupId>
     <artifactId>HikariCP</artifactId>
     <version>3.3.1</version>
  </dependency>
  <!-- For MySQL -->
  <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <version>5.1.40</version>
  </dependency>
  <dependency>
     <groupId>com.microsoft.sqlserver</groupId>
     <artifactId>mssql-jdbc</artifactId>
     <version>6.1.0.jre8</version>
  </dependency>
  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-configuration-processor</artifactId>
     <optional>true</optional>
  </dependency>
  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-tomcat</artifactId>
     <scope>provided</scope>
  </dependency>
</dependencies>
<build>
  <plugins>
     <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
     </plugin>
  </plugins>
</build>
</project>

提前致谢。

Answer 1

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

您重复了此一项，请删除其中一项。

您可以通过这样做来允许重复

 <webAppConfig>
    ...
    <allowDuplicateFragmentNames>true</allowDuplicateFragmentNames>
    ...
  </webAppConfig>