Code >> servlets>>javax.servlet.ServletException: Error instantiating servlet class view

javax.servlet.ServletException: Error instantiating servlet class view

javax.servlet.ServletException: Error instantiating servlet class view

I have first time coded jdbc application using javabeans. Login page authentication works successfulyy but I want to retrieve the data and its not working.
So error must be in view.jsp or view.java page..
can any one please see it!!

Hereby I've attached the code...
view.java
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package bean;  
 
import static bean.Provider.CONNECTION_URL;  
import static bean.Provider.DRIVER;  
import static bean.Provider.PASSWORD;  
import static bean.Provider.USERNAME;  
 
import java.sql.*;  
import java.util.*;  
 
public class view   {  
       
    String error;  
      
    List<Object> allData=new ArrayList<Object>();  
       
    public String name,clas;  
    public int rollno,mono;  
    static Connection con=null;  
    Object obj=new Object();  
   
    public void setObj(Object obj) {  
        this.obj = obj;  
    }  
    public String getError() {  
        return error;  
    }  
    public List getDb_Data()  
    {  
        int i=0;  
        try 
        {  
            try{  
                Class.forName(DRIVER);  
                con=DriverManager.getConnection(CONNECTION_URL,USERNAME,PASSWORD);  
            }  
            catch(Exception e){  
                System.out.println("Error occurred " +e);  
            }  
          
                String qry;  
                Connection con=ConnectionProvider.getCon();  
                Statement s = con.createStatement();                 
                qry="Select name,rollno,clas,mono from student";  
                ResultSet r=s.executeQuery(qry);  
 
                while(r.next())  
                {  
                    DataFields d=new DataFields(r.getString(1), r.getInt(2), r.getString(3), r.getInt(4));  
                    allData.add(i,d);  
                    i++;  
                }  
                   
        }  
        catch(Exception ex)  
        {  
                error="<b>Contact Administrator :</b><br/>" + ex;  
                System.out.println("Your query is not working" + ex);  
        }  
       return allData;  
    }  
    public String getName()  
    {  
        this.name=((DataFields)obj).name;  
        return this.name;  
    }  
    public int getRollno() {  
        this.rollno=((DataFields)obj).rollno;  
        return this.rollno;  
    }  
   
    public String getClas() {  
        this.clas=((DataFields)obj).clas;  
        return this.clas;  
    }  
    public int getMono() {  
        this.mono=((DataFields)obj).mono;  
        return this.mono;  
    }  
   
    public class DataFields  
    {  
        public String name,clas;  
        public int rollno,mono;  
          
   
        public DataFields(String  name,int  rollno,String  clas,int  mono)  
        {  
            this.name=name;  
            this.rollno=rollno;  
            this.clas=clas;  
            this.mono=mono;  
        }  
    }  
} 
package bean;

import static bean.Provider.CONNECTION_URL;
import static bean.Provider.DRIVER;
import static bean.Provider.PASSWORD;
import static bean.Provider.USERNAME;

import java.sql.*;
import java.util.*;

public class view {
    
    String error;
   
    List<Object> allData=new ArrayList<Object>();
    
    public String name,clas;
    public int rollno,mono;
 static Connection con=null;
    Object obj=new Object();
 
    public void setObj(Object obj) {
        this.obj = obj;
    }
    public String getError() {
        return error;
    }
    public List getDb_Data()
    {
        int i=0;
        try
        {
         try{
       Class.forName(DRIVER);
       con=DriverManager.getConnection(CONNECTION_URL,USERNAME,PASSWORD);
      }
      catch(Exception e){
       System.out.println("Error occurred " +e);
      }
     
                String qry;
       Connection con=ConnectionProvider.getCon();
       Statement s = con.createStatement();              
                qry="Select name,rollno,clas,mono from student";
                ResultSet r=s.executeQuery(qry);

                while(r.next())
                {
                    DataFields d=new DataFields(r.getString(1), r.getInt(2), r.getString(3), r.getInt(4));
                    allData.add(i,d);
                    i++;
                }
                
        }
        catch(Exception ex)
        {
                error="<b>Contact Administrator :</b><br/>" + ex;
                System.out.println("Your query is not working" + ex);
        }
       return allData;
    }
    public String getName()
    {
        this.name=((DataFields)obj).name;
        return this.name;
    }
    public int getRollno() {
        this.rollno=((DataFields)obj).rollno;
        return this.rollno;
    }
 
    public String getClas() {
        this.clas=((DataFields)obj).clas;
        return this.clas;
    }
    public int getMono() {
        this.mono=((DataFields)obj).mono;
        return this.mono;
    }
 
    public class DataFields
    {
     public String name,clas;
     public int rollno,mono;
       
 
        public DataFields(String  name,int  rollno,String  clas,int  mono)
        {
            this.name=name;
            this.rollno=rollno;
            this.clas=clas;
            this.mono=mono;
        }
    }
}


view.jsp
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<%@ page language="java" import="java.util.*" %>  
 
<jsp:useBean id="view" class="bean.view" scope="application" />  
<jsp:setProperty property="*" name="obj"/>  
   
<table width="900" cellspacing="0" cellpadding="0">  
    <tr>  
        <td>Name</td>  
        <td>Roll Number</td>  
        <td>Class</td>  
        <td>Mobile Number</td>          
    </tr>  
 
    <%  
    List<Object> list=new ArrayList<Object>();  
    list=view.getDb_Data();  
      
    for(int i=0;i<list.size();i++)   {  
        view.setObj(list.get(i));  
    %>  
           
    <tr>  
        <td><% out.print(view.getName()); %></td>  
        <td><% out.print(view.getRollno()); %></td>  
        <td><% out.print(view.getClas()); %></td>  
        <td><% out.print(view.getMono()); %></td>  
    </tr>  
      
    <% } %>  
</table> 
<%@ page language="java" import="java.util.*" %>

<jsp:useBean id="view" class="bean.view" scope="application" />
<jsp:setProperty property="*" name="obj"/>
 
<table width="900" cellspacing="0" cellpadding="0">
    <tr>
  <td>Name</td>
  <td>Roll Number</td>
  <td>Class</td>
  <td>Mobile Number</td>       
    </tr>

 <%
 List<Object> list=new ArrayList<Object>();
 list=view.getDb_Data();
 
 for(int i=0;i<list.size();i++) {
  view.setObj(list.get(i));
 %>
        
    <tr>
        <td><% out.print(view.getName()); %></td>
        <td><% out.print(view.getRollno()); %></td>
        <td><% out.print(view.getClas()); %></td>
        <td><% out.print(view.getMono()); %></td>
    </tr>
   
    <% } %>
</table>


and error is,
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      HTTP Status 500 - Error instantiating servlet class view  
 
--------------------------------------------------------------------------------  
 
type Exception report  
 
message Error instantiating servlet class view  
 
description The server encountered an internal error that prevented it from fulfilling this request.  
 
exception   
 
javax.servlet.ServletException: Error instantiating servlet class view  
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)  
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)  
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)  
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)  
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)  
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)  
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)  
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
    java.lang.Thread.run(Unknown Source)  
 
 
root cause   
 
java.lang.ClassNotFoundException: view  
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1713)  
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1558)  
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)  
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)  
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)  
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)  
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)  
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)  
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)  
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)  
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)  
    java.lang.Thread.run(Unknown Source)  
 
 
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.39 logs.  
 
 
--------------------------------------------------------------------------------  
 
Apache Tomcat/7.0.39 
   HTTP Status 500 - Error instantiating servlet class view

--------------------------------------------------------------------------------

type Exception report

message Error instantiating servlet class view

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

exception

javax.servlet.ServletException: Error instantiating servlet class view
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
 org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
 org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
 org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
 org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
 java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 java.lang.Thread.run(Unknown Source)


root cause

java.lang.ClassNotFoundException: view
 org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1713)
 org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1558)
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
 org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
 org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
 org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
 org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
 java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 java.lang.Thread.run(Unknown Source)


note The full stack trace of the root cause is available in the Apache Tomcat/7.0.39 logs.


--------------------------------------------------------------------------------

Apache Tomcat/7.0.39

 


web.xml
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<?xml version="1.0" encoding="UTF-8"?>  
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  
  <display-name>logindevelopement</display-name>  
  <welcome-file-list>  
    <welcome-file>index.html</welcome-file>  
    <welcome-file>index.htm</welcome-file>  
    <welcome-file>index.jsp</welcome-file>  
    <welcome-file>default.html</welcome-file>  
    <welcome-file>default.htm</welcome-file>  
    <welcome-file>default.jsp</welcome-file>  
  </welcome-file-list>  
 
  <servlet>  
    <servlet-name>DataInsertTable</servlet-name>  
    <servlet-class>DataInsertTable</servlet-class>  
  </servlet>  
  <servlet-mapping>  
    <servlet-name>DataInsertTable</servlet-name>  
    <url-pattern>/DataInsertTable</url-pattern>  
  </servlet-mapping>  
 
  <servlet>  
    <servlet-name>view</servlet-name>  
    <servlet-class>view</servlet-class>  
  </servlet>  
  <servlet-mapping>  
    <servlet-name>view</servlet-name>  
    <url-pattern>/view</url-pattern>  
  </servlet-mapping>  
 
  <servlet>  
    <servlet-name>bean.view</servlet-name>  
    <servlet-class>bean.view</servlet-class>  
  </servlet>  
  <servlet-mapping>  
    <servlet-name>bean.view</servlet-name>  
    <url-pattern>/bean.view</url-pattern>  
  </servlet-mapping>  
 
 
</web-app> 
I see two problems with that:
1) servlet-class "view" cannot be found. That's what your exception is explicitly telling you.
2) servlet-class "bean.view" is not a servlet. You can't make something a servlet just by putting it as a servlet in web.xml. It must implement Servlet, often by extending HttpServlet.

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