[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war

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>

巴特西

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war

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