maven install Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war (default-war) on project web_nanchang

maven打包成war时,报错:Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war (default-war) on project web_nanchang: Error assembling WAR: webxml attribute is required 
原因:找不到web.xml,但是项目中明明有这个文件,在WebContent/WEB-INF/文件夹下,就是识别不了
解决方法:
需要在pom.xml文件中,加上maven-war-plugin插件配置
在<build>节点中增加:

    <plugins>

        <plugin>

            <groupId>org.apache.maven.plugins</groupId>

            <artifactId>maven-war-plugin</artifactId>

            <version>2.4</version>

            <configuration>

                <webResources>

                    <resource>

                        <directory>WebContent</directory>

                    </resource>

                </webResources>

            </configuration>

        </plugin>

    </plugins>

如果项目中原本没有web.xml文件,就需要加上下面的配置:

    <plugins>

        <plugin>

            <groupId>org.apache.maven.plugins</groupId>

            <artifactId>maven-war-plugin</artifactId>

            <version>2.4</version>

            <configuration>

                <failOnMissingWebXml>false</failOnMissingWebXml>

            </configuration>

        </plugin>

    </plugins>