java连接数据库问题

我用myeclipse连接数据库出现问题，意思好像是数据库问题；
报错HTTP Status 500
description The server encountered an internal error () that prevented it from fulfilling this request.


java.lang.NullPointerException
    com.hygj.util.TestInfoUtil.zhuceAndGetPwd(TestInfoUtil.java:93)
    com.hygj.servlet.RegisterServlet.doGet(RegisterServlet.java:55)
    com.hygj.servlet.RegisterServlet.doPost(RegisterServlet.java:103)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    com.hygj.servlet.CharacterFilter.doFilter(CharacterFilter.java:25)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.



请问各位高手，到底是怎么了??