unable to have jdbc connection in jsp file
Question
hey all i am trying to have simple jdbc connection in my jsp file the file is as under:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@page import="java.sql.DriverManager"%><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
hello world.
<%
try{
Class.forName("com.mysql.jdbc.Driver");
DriverManager.getConnection("jdbc:mysql://localhost:3306/saurabh","root","");
System.out.println("Connection successful");
}catch(Exception e){
e.printStackTrace();
}
%>
</body>
</html>
whenever i try to run this code i get following console output in eclipse:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.apache.jsp.myJspDemo_jsp._jspService(myJspDemo_jsp.java:68)
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:386)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
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(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
one last thing when i tried to have the same kind of connection from a simple java file then this was working. so what's the problem with jsp file.
PS: I am working on Ubuntu 10.10 distro and with Eclipse 3.5. And i have also added the jar file to the java build path of Project. And this is working just fine on windows.
So what to do??
Thanks in Advance :)
3 answers
solution1
3 2011-04-08 07:39:51
You need to deploy the mysql driver to your servlet container (Tomcat / Jetty ) so that the JSPs can find them.
But as @crafstman said in the comment, it is very bad practice to put DB related stuff in the display code. Be it for security reasons, be it for performance.
solution2
3 2011-04-08 07:49:24
在将MySQL驱动程序JAR部署到服务器之前，应将其放置在项目的WEB-INF/lib目录中。
solution3
0 2011-04-08 07:50:01
Put your MySQL driver to tomcat/lib or You can put the MySQL driver to yourapplicationproject/WebContent/WEB-INF/lib
Putting the database connection into jsp is not good practice. I will be better if you put the database connection in to Servlet code
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