Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml

maven构建报错：

Caused by: org.apache.maven.plugin.MojoExecutionException: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)

at org.apache.maven.plugin.war.WarMojo.execute(WarMojo.java:191)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
... 20 more
Caused by: org.codehaus.plexus.archiver.ArchiverException: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)
at org.codehaus.plexus.archiver.war.WarArchiver.initZipOutputStream(WarArchiver.java:162)
at org.codehaus.plexus.archiver.zip.AbstractZipArchiver.createArchiveMain(AbstractZipArchiver.java:309)
at org.codehaus.plexus.archiver.zip.AbstractZipArchiver.execute(AbstractZipArchiver.java:211)
at org.codehaus.plexus.archiver.AbstractArchiver.createArchive(AbstractArchiver.java:944)
at org.apache.maven.archiver.MavenArchiver.createArchive(MavenArchiver.java:598)
at org.apache.maven.plugin.war.WarMojo.performPackaging(WarMojo.java:244)
at org.apache.maven.plugin.war.WarMojo.execute(WarMojo.java:175)

原因:构建项目的WEB-INF目录下找不到web.xml

1、创建web.xml文件

2、不创建web.xml文件加入以下代码

<plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.6</version>
            <configuration>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
    </plugins>