报这个一个错误：Deployment failure on Tomcat 6.x. Could not copy all resources to E:/J2EE/tomcat/apache-tomcat-6.0.20/webapps/building. If a file is locked, you can wait until the lock times out to redeploy, or stop the server and redeploy, or manually remove the deployment at E:/J2EE/tomcat/apache-tomcat-6.0.20/webapps/building
这是因为jar包丢失的原因所造成的，选择该项目，右击有一个buildpath选择最后一个，看到jar前面有“！”的即为丢失的jar，应将他们删掉