关于#javaweb#的问题，如何解决

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这是哪里出了问题
Type Exception Report

Message null

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception
java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
wangruoyu.servlet.ShopkeeperPageListServlet.doGet(ShopkeeperPageListServlet.java:39)
javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Note The full stack trace of the root cause is available in the server logs.

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这个类的39行，

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这些是不是没有值呀，NUll

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