Using beans with jsp without any ide

Hi
i am using tomcat 6.0 and jdk 1.6u17
i am trying to use a bean to connect to MySql db using jsp page but i keep getting the error :
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
i read about it and i think that it is unable to locate my bean class file
here is the beanDb.java
package beans;
import java.sql.*;
import java.io.*;
public class beanDb
     private Connection dbCon;
     String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
     String dbDriver="com.mysql.jdbc.Driver";
     public beanDb()
          super();
     public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
     public void close() throws SQLException
     dbCon.close();
     public void path()
     public ResultSet execSQL(String sql) throws SQLException
          Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
     public int updateSQL(String sql) throws SQLException
     Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>
<%
               out.println(beanDb.connect());
               Connection connection;
               Statement stmt = null;
               ResultSet rs = null;
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\myApp\jsptest.jsp
Please suggest a solution..
Thanks

here is the changed code but still the same error:
package beans;
import java.sql.;
import java.io.;
public class beanDb
private Connection dbCon;
String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
String dbDriver="com.mysql.jdbc.Driver";
public beanDb()
super();
public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
public void close() throws SQLException
dbCon.close();
public void path()
public ResultSet execSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
public int updateSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>
<%
out.println(beanDb.connect());
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\jsptest.jsp

Similar Messages

Using beans with jsp

Hi
i am using tomcat 6.0 and jdk 1.6u17
i am trying to use a bean to connect to MySql db using jsp page but i keep getting the error :
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
i read about it and i think that it is unable to locate my bean class file
here is the beanDb.java
package beans;
import java.sql.;
import java.io.;
public class beanDb
private Connection dbCon;
String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
String dbDriver="com.mysql.jdbc.Driver";
public beanDb()
super();
public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
public void close() throws SQLException
dbCon.close();
public void path()
public ResultSet execSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
public int updateSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>
<%
out.println(beanDb.connect());
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\jsptest.jsp
Please suggest a solution..
Thanks

http://forums.sun.com/thread.jspa?threadID=5423314

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Error while using Beans in JSP

I am using netbeans to develop the applications and am using tomcat version (jakarta-tomcat-4.1.18).
When I execute the following program i get the below mentioned error::
StringBean.java
package test;
import java.beans.*;
public class StringBean {
private String message = "No message SPECIFIED";
public String getMessage() {
return message;
public void setMessage(String message) {
this.message = message;
StringBean.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>Using JavaBeans with JSP </TITLE>
<LINK REL=STYLESHEET HREF="JSP-Styles.css" TYPE="text/css" >
</HEAD>
<body
<jsp:useBean id = "SB" class = "test.StringBean" />
initial value is : <jsp:getProperty name = "SB" property= "message"/>
<jsp:setProperty name= "SB" property = "message" value= "this the message after the change"/>
final value is :<jsp:getProperty name = "SB" property= "message"/>
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</HTML>
javax.servlet.ServletException: test/StringBean
at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspServlet.java:349)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
     at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
     at java.lang.Thread.run(Thread.java:536)
Root Cause
java.lang.NoClassDefFoundError: test/StringBean
     at java.lang.Class.getDeclaredConstructors0(Native Method)
     at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
     at java.lang.Class.getConstructor0(Class.java:1762)
     at java.lang.Class.newInstance0(Class.java:276)
     at java.lang.Class.newInstance(Class.java:259)
at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.load(IDEJspServlet.java:106)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.loadIfNecessary(IDEJspServlet.java:150)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet$JspServletWrapper.service(IDEJspServlet.java:160)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.serviceJspFile(IDEJspServlet.java:246)
     at org.netbeans.modules.tomcat.tomcat40.runtime.IDEJspServlet.service(IDEJspServlet.java:339)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
     at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
     at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
     at java.lang.Thread.run(Thread.java:536)

Ok The class isn't found, so your classpath settings of netbeans (if you are using the run function in netbeans) isn't set.
and if you aren't using netbeans to run it, then the class isn't in the webapp/WEB-INF/classes
good luck

Using beans with jsp without any ide

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