tomcat突然无法启动，servlet-mapp…

cmd命令行运行startup.bat 出现如下错误：

Using CATALINA_BASE:  /home/timepower/.IntelliJIdea13/system/tomcat/_Cross

UsingCATALINA_HOME:  /home/timepower/Tomcat

Using CATALINA_TMPDIR: /home/timepower/Tomcat/temp

UsingJRE_HOME:       /opt/java

UsingCLASSPATH:      /home/timepower/Tomcat/bin/bootstrap.jar:/home/timepower/Tomcat/bin/tomcat-juli.jar

   
    UserLoginServlet
   servlet.UserLoginServlet
 
 
    LoginServlet               //错误在此
   /servlet/UserLoginServlet
 
 


source：
http://www.oschina.net/question/945607_156845?sort=time#answers