java - Tomcat无法通过JDBC连接器连接到mysql

Question

我有一个 web 应用程序，我试图用 java6、tomcat6 和 mysql5.5 部署在远程 Windows 2003 服务器上。当我点击应用程序 url 部署应用程序后，出现以下错误。我做了一些谷歌，发现一些链接说要将连接字符串中的 localhost 更改为 127.0.0.1 但这没有用，一些链接说要检查连接字符串所以我创建了同一台 Windows 机器上的一个简单的 Java 类，用于测试连接字符串、用户名和密码。当我运行那个类时它工作正常没有任何错误但是当我运行使用相同连接字符串和用户名和密码的 Web 应用程序时它抛出错误。还有一些链接建议修改mysql的my.ini，但我在mysql安装目录下没有找到任何my.ini。

我没有得到任何线索来处理这个错误，所以你能指导我吗？完整的堆栈跟踪如下

INFO: Server startup in 2832 ms
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link fai
lure

The last packet sent successfully to the server was 0 milliseconds ago. The driv
er has not received any packets from the server.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1
117)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:350)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2408)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2
445)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2230)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:813)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:334)
        at java.sql.DriverManager.getConnection(DriverManager.java:582)
        at java.sql.DriverManager.getConnection(DriverManager.java:185)
        at com.adxchange.utils.DBConnectionSingleton.getConnection(DBConnectionS
ingleton.java:28)
        at com.adxchange.utils.ADXchange.getStates(ADXchange.java:402)
        at org.apache.jsp.homepage_jsp._jspService(homepage_jsp.java:252)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:388)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatc
her.java:416)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:293)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcesso
r.java:877)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.pr
ocess(Http11AprProtocol.java:594)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:16
75)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.net.ConnectException: Connection timed out: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at java.net.Socket.connect(Socket.java:478)
        at java.net.Socket.<init>(Socket.java:375)
        at java.net.Socket.<init>(Socket.java:218)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.ja
va:259)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
        ... 38 more
getStates: Error in database connection

会不会是权限问题？

编辑:

我还在系统变量中创建了CLASSPATH变量，并在其中添加了java\lib和tomcat\lib路径，但仍然没有结果。

Answer 1

抱歉， friend 们让您费心查看和回答我的问题，但我找到了解决方案。实际上，我为所有数据库和其他可更改的东西使用了 .properties 文件是我的愚蠢错误，问题是我修改了错误的属性文件。太尴尬了，我为了简单的事情弄得一团糟。无论如何，非常感谢你们的帮助。