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POjava jsp display data from database
 

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    <p>Hi I am trying to display the content of a database in the jsp page.. I would like the connection and processing of data to be in java file and only the display of the data will be included in the jsp page.</p> <p>I am using tomcat server. I have ojdbc6.jar and jstl-1.2.jar on my WEB-INF/lib folder.</p> <p>Kindly advise what I am missing. Any idea would be appreciated. Thank you.</p> <p>Here is the content of the java file.</p> <h2> DBConn.java</h2> <pre><code>public class DBConn extends HttpServlet { public void getData(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { Connection connection = null; List dataList = new ArrayList(); try { // Load the JDBC driver String driverName = "oracle.jdbc.driver.OracleDriver"; Class.forName(driverName); // Create a connection to the database String serverName = "localhost"; String portNumber = "1521"; String sid = "xe"; String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid; String username = "hr"; String password = "hr"; connection = DriverManager.getConnection(url, username, password); Statement stmt = connection.createStatement(); ResultSet rset = stmt.executeQuery("select * from employees"); while (rset.next()) { dataList.add(rset.getInt("employee_id")); dataList.add(rset.getString("first_name")); } stmt.close(); } catch (ClassNotFoundException e) { // Could not find the database driver } catch (SQLException e) { // Could not connect to the database } request.setAttribute("data", dataList); String strViewPage = "index.jsp"; RequestDispatcher dispatcher = request.getRequestDispatcher(strViewPage); if (dispatcher != null) { dispatcher.forward(request, response); } } } </code></pre> <p>Here is the content of the jsp file.</p> <h2> index.jsp</h2> <pre><code>&lt;%@page import="java.util.List"%&gt; &lt;%@page import="java.util.Iterator"%&gt; &lt;%@page language="java" import="java.util.*" %&gt; &lt;%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %&gt; &lt;%@page contentType="text/html" pageEncoding="UTF-8"%&gt; &lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;JSP Page&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;h1&gt;Hello World!&lt;/h1&gt; &lt;table border="1" width="303"&gt; &lt;tr&gt; &lt;td width="119"&gt;&lt;b&gt;Employee ID&lt;/b&gt;&lt;/td&gt; &lt;td width="168"&gt;&lt;b&gt;First Name&lt;/b&gt;&lt;/td&gt; &lt;/tr&gt; &lt;%Iterator itr;%&gt; &lt;% List data = (List) request.getAttribute("data"); for (itr = data.iterator(); itr.hasNext();) { %&gt; &lt;tr&gt; &lt;td width="119"&gt;&lt;%=itr.next()%&gt;&lt;/td&gt; &lt;td width="168"&gt;&lt;%=itr.next()%&gt;&lt;/td&gt; &lt;/tr&gt; &lt;%}%&gt; &lt;/table&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <h2>web.xml</h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"&gt; &lt;!-- Config here. No taglibs! --&gt; &lt;!-- To change this template, choose Tools | Templates and open the template in the editor. --&gt; &lt;!--web.xml code --&gt; &lt;servlet&gt; &lt;servlet-name&gt;DBConn&lt;/servlet-name&gt; &lt;servlet-class&gt;DBConn&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;DBConn&lt;/servlet-name&gt; &lt;url-pattern&gt;/DBConn&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;/web-app&gt; </code></pre> <h2>Output:</h2> <pre><code>org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 26 23: &lt;/tr&gt; 24: &lt;%Iterator itr;%&gt; 25: &lt;% List data = (List) request.getAttribute("data"); 26: for (itr = data.iterator(); itr.hasNext();) { 27: %&gt; 28: &lt;tr&gt; 29: &lt;td width="119"&gt;&lt;%=itr.next()%&gt;&lt;/td&gt; Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) root cause java.lang.NullPointerException org.apache.jsp.index_jsp._jspService(index_jsp.java:88) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) </code></pre>
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    1. COSo what is your question?
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    2. COIdeally put `stmt.close();` , `connection.close();`, `rset.close();` in `finally` block, so these will be executed regardless.
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    3. COYour servlet is missing `doGet` or `doPost` service methods.
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