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Question

HTTP Status 500 -
type Exception report

message
description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
net.blogjava.mobile.QueryServlet.service(QueryServlet.java:31)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.24 logs.

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Apache Tomcat/8.0.24

Answer 1

这个QueryServlet类下的方法service 中出现null值参数进行使用QueryServlet.java:31行