HTTP Status [500] ? [Internal Server Error] Type Exception Report Description The server encountered an unexpected condition that prevented it from fulfilling the request. Exception java.lang.NullPointerException java.util.ComparableTimSort.countRunAndMakeAscending(Unknown Source) java.util.ComparableTimSort.sort(Unknown Source) java.util.Arrays.sort(Unknown Source) util.CheckUtil.checkSignature(CheckUtil.java:21) servlet.WeixinServlet.doGet(WeixinServlet.java:35) 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:53) Note The full stack trace of the root cause is available in the server logs. Apache Tomcat/9.0.0.M21
这些都是什么意思啊？
这个是空指针异常问题