webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)

1、错误描述

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Cdmp 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Cdmp ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Cdmp ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ Cdmp ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ Cdmp ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ Cdmp ---
[INFO] 
[INFO] --- maven-war-plugin:2.2:war (default-war) @ Cdmp ---
[INFO] Packaging webapp
[INFO] Assembling webapp [Cdmp] in [F:workspaceCdmp	argetCdmp-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Copying webapp resources [F:workspaceCdmpsrcmainwebapp]
[INFO] Webapp assembled in [65 msecs]
[INFO] Building war: F:workspaceCdmp	argetCdmp-0.0.1-SNAPSHOT.war
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.181 s
[INFO] Finished at: 2017-01-10T11:08:36+08:00
[INFO] Final Memory: 11M/154M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project Cdmp: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

2、错误原因

     在创建maven项目时，未新建web.xml

3、解决办法

（1）在WEB-INF目录下新建web.xml