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【HTTP Status 500 - Servlet execution threw an exception】的解决方式
在网上翻了半天,终于在评论区发现了这个问题的解决方式,之所以报错是因为我创建Web项目时使用的是maven,而我把druid.properties这个文件随便放在一个包里,导致一直报错,正确做法是:使用maven需要把druid文件放到resources下面
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type Exception report
message Servlet execution threw an exception
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet execution threw an exception
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ExceptionInInitializerError
web.servlet.login.UserDao.<init>(UserDao.java:8)
web.servlet.login.LoginServlet.doGet(LoginServlet.java:22)
web.servlet.login.LoginServlet.doPost(LoginServlet.java:40)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NullPointerException
java.util.Properties$LineReader.readLine(Properties.java:434)
java.util.Properties.load0(Properties.java:353)
java.util.Properties.load(Properties.java:341)
web.servlet.login.JDBCUtils.<clinit>(JDBCUtils.java:24)
web.servlet.login.UserDao.<init>(UserDao.java:8)
web.servlet.login.LoginServlet.doGet(LoginServlet.java:22)
web.servlet.login.LoginServlet.doPost(LoginServlet.java:40)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
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/8.0.26 logs.
Apache Tomcat/8.0.26