创建springboot项目，且不采用<parent>引入springboot时，pom.xml如下：
<?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>
<groupId>com.example</groupId>
<artifactId>demo-without-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>demo-without-parent</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.0.2.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
执行
mvn clean install
控制台报错：
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war
原因：当设置为war时，web.xml必须存在。
解决：可通过插件配置属性将其忽略。
首先，spring-boot-dependencies 这个pom文件，找到
<maven-war-plugin.version>3.1.0</maven-war-plugin.version>
找到版本号是3.1.0
然后，在项目的pom.xml中，加入
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.1.0</version>
</plugin>
版本号必须与spring-boot-dependencies中maven-war-plugin-version版本号一致。
再次运行mvn clean install ，提示打包成功。
在idea中，运行启动类，成功启动。但是
java -jar demo-without-parent-0.0.1-SNAPSHOT.war 提示：demo-without-parent-0.0.1-SNAPSHOT.war中没有主清单属性
因为，maven-war-plugin的确执行了，但是spring-boot-maven-plugin插件却没有执行，原因在于该插件未指定版本，故设置版本号，依旧是从spring-boot-dependencies中找对应的版本号：2.0.2.RELEASE
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.0.2.RELEASE</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
重新执行
mvn clean install ，
mvn clean install java -jar demo-without-parent-0.0.1-SNAPSHOT.war
成功。
最后总结：
1）、maven-war-plugin插件新老版本差异：
2.2：项目中WEB-INF下必须存在web.xml
3.1.0:不需要依赖web.xml
而且，版本号必须与所引入的spring-boot-dependencies下的maven-war-plugin版本号一致。
2）、spring-boot-maven-plugin插件需要配置repackage，否则不会添加spring boot 引导依赖，进而无法引导当前应用。
3）、根据使用习惯通常不会采用spring-boot-dependencies
附，完整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>
<groupId>com.example</groupId>
<artifactId>demo-without-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>demo-without-parent</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.0.2.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.0.2.RELEASE</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.1.0</version>
</plugin>
</plugins>
</build>
</project>
原文地址：https://www.cnblogs.com/yaoyuan2/p/11703540.html
时间： 2024-10-07 23:37:14