Eclipse做的系统运行有错误，是servlet的问题么？
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
com.sccp.petsystem.service.LoginService.validateLogin(LoginService.java:23)
com.sccp.petsystem.servlet.LoginServlet.doPost(LoginServlet.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.
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Apache Tomcat/6.0.13
