标签：cat pom group prope work compiler put www 忽略
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>
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war
标签：cat pom group prope work compiler put www 忽略
原文地址：https://www.cnblogs.com/yaoyuan2/p/11703540.html
