springboot打包为war包报错：提示缺少web.xml

Case

执行命令maven package将spring boot项目打成war包报错&＃xff1a;

$ mvn package
//...
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war
(default-war) on project spring4-mvc-maven-ajax-example: Error assembling WAR: webxml attribute is required
(or pre-existing WEB-INF/web.xml if executing in update mode) -> [Help 1]

Cause

spring boot项目中引用了依赖包spring-boot-starter-web。该包中引用的spring-boot-starter-tomcat里包含了tomcat嵌入式servlet容器&＃xff0c;其不同版本实现的是不同的servlet版本规范。servlet规范与tomcat两者版本对应关系如下&＃xff1a;

Solution

1. For servlet container <3, make sure WEB-INF/web.xml file exists.

Default location for web.xml is "/src/main/webapp/WEB-INF/web.xml"

2. For servlet container >&＃61;3, and NO web.xml web application, declares the following maven-war-plugin plugin, and set the failOnMissingWebXml option to false.

pom.xml


org.apache.maven.pluginsmaven-war-plugin2.6false