HTTP Status 500 – Internal Server Error Type Exception Report Message install failed! Description The server encountered an unexpected condition that prevented it from fulfilling the request. Exception javax.servlet.ServletException: install failed! com.jeecms.cms.InstallServlet.doPost(InstallServlet.java:71) javax.servlet.http.HttpServlet.service(HttpServlet.java:660) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Root Cause com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) java.lang.reflect.Constructor.newInstance(Constructor.java:423) com.mysql.jdbc.Util.handleNewInstance(Util.java:425) com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:989) com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341) com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2189) com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2222) com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2017) com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779) com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) java.lang.reflect.Constructor.newInstance(Constructor.java:423) com.mysql.jdbc.Util.handleNewInstance(Util.java:425) com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389) com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) java.sql.DriverManager.getConnection(DriverManager.java:664) java.sql.DriverManager.getConnection(DriverManager.java:270) com.jeecms.cms.Install.createDb(Install.java:65) com.jeecms.cms.InstallServlet.doPost(InstallServlet.java:39) javax.servlet.http.HttpServlet.service(HttpServlet.java:660) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Root Cause java.net.ConnectException: 拒绝连接 (Connection refused) java.net.PlainSocketImpl.socketConnect(Native Method) java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) java.net.Socket.connect(Socket.java:589) com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211) com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300) com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2189) com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2222) com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2017) com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779) com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) java.lang.reflect.Constructor.newInstance(Constructor.java:423) com.mysql.jdbc.Util.handleNewInstance(Util.java:425) com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389) com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) java.sql.DriverManager.getConnection(DriverManager.java:664) java.sql.DriverManager.getConnection(DriverManager.java:270) com.jeecms.cms.Install.createDb(Install.java:65) com.jeecms.cms.InstallServlet.doPost(InstallServlet.java:39) javax.servlet.http.HttpServlet.service(HttpServlet.java:660) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 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/8.5.43

您好   我们项目目前不支持8.5的tomcat   最高只支持8.0的  您可以切换下tomcat1的版本

回复第2楼
您好，我换成tomcat7还是同样的错误，请问有什么解决办法吗？

看下您的jdbc链接数据  看下是不是对的

回复第4楼
我用项目自带的jdbc链接也是用样的错误，我都更换成我自己本地的了还是不可以

HTTP Status 500 - install failed!
type Exception report

message install failed!

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

exception

javax.servlet.ServletException: install failed!
com.jeecms.cms.InstallServlet.doPost(InstallServlet.java:71)
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.ClassNotFoundException: com.mysql.jdbc.Driver
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1339)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:264)
com.jeecms.cms.Install.getConn(Install.java:35)
com.jeecms.cms.Install.changeDbCharset(Install.java:77)
com.jeecms.cms.InstallServlet.doPost(InstallServlet.java:41)
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/8.0.47 logs.

Apache Tomcat/8.0.47

使用的是jdk-8u181-windows-x64，apache-tomcat-8.0.47，mysql-installer-community-5.7.27.0

那您现在这个是开源版本的嘛？  开源版本您可以下载下源码使用源码内的建库sql先建库看下

已经试过先建数据库了，还是报错。

您看下用您填写的信息能连接上数据库吗？  我看了您的报错都是jdbc无法连接导致的