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Question

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
dao.impl.GoodsDaoImpl.selectAllGoods(GoodsDaoImpl.java:63)
service.impl.GoodsServiceImpl.findAllGoods(GoodsServiceImpl.java:18)
servlet.FindAllGoodsServlet.doGet(FindAllGoodsServlet.java:50)
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.

Apache Tomcat/8.5.35

Answer 1

伙计，很明显啊，GoodsDaoImpl.java:63行抛出空指针异常(java.lang.NullPointerException),得到的结果是个null。