I am getting following error in JSP page
SELECT * FROM books WHERE id =1001
Exception Occuredjava.lang.NumberFormatException: null
while running below code. I doubt this is due to
input type='text' size='3' value='1' name='qty'<%=id% in JSearch.jsp is not properly linked to
int qtyOrdered = Integer.parseInt(request.getParameter("qty"+id)); in JOrder.jsp.
Can any one please help me on this.
Code: JSearch.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import = "java.sql.*" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Search Page</title>
</head>
<body>
<% try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection ("jdbc:oracle:thin:@//XXXXX.XXX:1521/xe", "sai", "harisai");
Statement stmt=conn.createStatement();
// Retrieve and process request parameters: "author" and "search"
String author = request.getParameter("author");
boolean hasAuthorParam = author != null && !author.equals("Select...");
String searchWord = request.getParameter("search");
boolean hasSearchParam = searchWord != null && ((searchWord = searchWord.trim()).length() > 0);%>
<h2>Query Results</h2>
<%if (!hasAuthorParam && !hasSearchParam) { %> <%--No params present--%>
<h3>Please select an author or enter a search term!</h3>
<p><a href='Entryscreen.jsp'>Back to Select Menu</a></p>
<% }
else {
// Form a SQL command based on the param(s) present
StringBuilder sqlStr = new StringBuilder(); // more efficient than String
sqlStr.append("SELECT * FROM books WHERE qty > 0 AND (");
if (hasAuthorParam) {
sqlStr.append("author = '").append(author).append("'");
}
if (hasSearchParam) {
if (hasAuthorParam) {
sqlStr.append(" OR ");
}
sqlStr.append("author LIKE '%").append(searchWord)
.append("%' OR title LIKE '%").append(searchWord).append("%'");
sqlStr.append(") ORDER BY author, title");
}//
out.println(sqlStr); // for debugging
ResultSet rset = stmt.executeQuery(sqlStr.toString());
if (!rset.next()) { %> <%--// Check for empty ResultSet (no book found)--%>
<h3>No book found. Please try again!</h3>
<p><a href='start'>Back to Select Menu</a></p>
<%}
else {%>
<%--// Print the result in an HTML form inside a table--%>
<form method='get' action='JOrder.jsp'>
<table border='1' cellpadding='6'>
<tr>
<th> </th>
<th>AUTHOR</th>
<th>TITLE</th>
<th>PRICE</th>
<th>QTY</th>
</tr>
<%-- // ResultSet's cursor now pointing at first row--%>
<% do {
// Print each row with a checkbox identified by book's id
String id = rset.getString("id");%>
<tr>
<td><input type='checkbox' name='id' value='<%=id%>' /></td>
<td><%=rset.getString("author")%></td>
<td><%=rset.getString("title")%></td>
<td>$<%=rset.getString("price")%></td>
<td><input type='text' size='3' value='1' name='qty'<%=id%>/></td>
</tr>
<%} while (rset.next()); %>
</table><br/>
<%--// Ask for name, email and phone using text fields (arranged in a table)--%>
<table>
<tr><td>Enter your Name:</td>
<td><input type='text' name='cust_name'/></td></tr>
<tr><td>Enter your Email (user@host):</td>
<td><input type='text' name='cust_email' /></td></tr>
<tr><td>Enter your Phone Number (8-digit):</td>
<td><input type='text' name='cust_phone' /></td></tr></table><br />
<%-- // Submit and reset buttons--%>
<input type='submit' value='ORDER' />
<input type='reset' value='CLEAR' /></form>
<%
}
}
}
catch (Exception e){
out.println("Exception Occured:" +e);
} %>
</body>
</html>
Code: JOrder.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import = "java.sql.*" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Order Confirmation</title>
</head>
<body>
<h1>Order Confirmation</h1>
<% try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection ("jdbc:oracle:thin:@//XXXXX.XXX.LOCAL:1521/xe", "sai", "harisai");
Statement stmt=conn.createStatement();
// Retrieve and process request parameters: id(s), cust_name, cust_email, cust_phone
String[] ids = request.getParameterValues("id"); // Possibly more than one values
String custName = request.getParameter("cust_name");
boolean hasCustName = custName != null && ((custName = custName.trim()).length() > 0);
String custEmail = request.getParameter("cust_email").trim();
boolean hasCustEmail = custEmail != null && ((custEmail = custEmail.trim()).length() > 0);
String custPhone = request.getParameter("cust_phone").trim();
boolean hasCustPhone = custPhone != null && ((custPhone = custPhone.trim()).length() > 0);
// Validate inputs
if (ids == null || ids.length == 0) {%>
<h3>Please Select a Book!</h3>
<% } else if (!hasCustName) {%>
<h3>Please Enter Your Name!</h3>
<% } else if (!hasCustEmail || (custEmail.indexOf('@') == -1)) {%>
<h3>Please Enter Your e-mail (user@host)!</h3>
<%} else if (!hasCustPhone || (custPhone.length() != 8)) {%>
<h3>Please Enter an 8-digit Phone Number!</h3>
<%} else {%>
<%--// Display the name, email and phone (arranged in a table)--%>
<table>
<tr><td>Customer Name:</td><td><%=custName%></td></tr>
<tr><td>Customer Email:</td><td><%=custEmail%></td></tr>
<tr><td>Customer Phone Number:</td><td><%=custPhone%></td></tr></table>
<%--// Print the book(s) ordered in a table--%>
<br/>
<table border='1' cellpadding='6'>
<tr><th>AUTHOR</th><th>TITLE</th><th>PRICE</th><th>QTY</th></tr>
<% float totalPrice = 0f;
for(String id : ids) {
String sqlStr = "SELECT * FROM books WHERE id ="+ id;
out.println(sqlStr);
// for debugging
ResultSet rset = stmt.executeQuery(sqlStr);
rset.next();
int qtyAvailable = rset.getInt("qty");
String title = rset.getString("title");
String author = rset.getString("author");
float price = rset.getFloat("price");
int qtyOrdered = Integer.parseInt(request.getParameter("qty"+id));
sqlStr = "UPDATE books SET qty = qty -"+ qtyOrdered +" WHERE id =" + id;
out.println(sqlStr); // for debugging
stmt.executeUpdate(sqlStr);
sqlStr = "INSERT INTO ORDER_RECORDS VALUES ("+ id + ", " + qtyOrdered + ", '" + custName + "', '"
+ custEmail + "', '" + custPhone + "')";
out.println(sqlStr); // for debugging
stmt.executeUpdate(sqlStr);%>
<%-- // Display this book ordered--%>
<tr>
<td><%=author%></td>
<td><%=title%></td>
<td><%=price%></td>
<td><%=qtyOrdered%></td></tr>
<% totalPrice += price * qtyOrdered;
}%>
<tr><td colspan='4' align='right'>Total Price: $
</td> <%out.println(totalPrice);%> </tr>
</table>
<h3>Thank you.</h3>
<%out.println("<p><a href='JEntryScreen.jsp'>Back to Select Menu</a></p>");
}
}
catch (Exception e) {
out.println("Exception Occured" +e);
}
finally {
}%>
</body>
</html>
I doubt this is due, but did you checked ? A NumberFormatException is most likely coming from the parse of a number. If you don't recover the value ... this will be complicated to parse a null (the exception tell you that it receivenull). So check if your form send theqty + idfirst.