Solutions to common problems in JSP file creation
Problem 1: JSP files cannot be parsed
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <title>JSP Example</title> </head> <body> <h1 id="Hello-World">Hello World!</h1> </body> </html>
Solution:
- Make sure the JSP file is saved in the correct directory. The JSP file should be saved in the WebContent directory of the web application.
- Make sure the JSP file has the correct file extension. JSP files should have a .jsp extension.
- Make sure the web application is configured correctly. The web application should be configured to use the JSP engine.
- Make sure the web server is configured correctly. The web server should be configured to support JSP.
Problem 2: The JSP file cannot be compiled
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
int a = 10;
int b = 20;
int c = a + b;
%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1 id="The-sum-of-a-and-b-is-c">The sum of (a) and (b) is (c).</h1>
</body>
</html>Solution:
- Ensure the JSP file Have correct grammar. JSP files should comply with JSP specifications.
- Make sure the Java code in the JSP file is valid. Java code should conform to Java syntax.
- Ensure that the EL expression in the JSP file is valid. EL expressions should conform to the EL specification.
Problem 3: The JSP file cannot be run
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1 id="Products">Products</h1>
<ul>
<c:forEach items="${products}" var="product">
<li>${product.name}</li>
</c:forEach>
</ul>
</body>
</html>Solution:
- Ensure the JSP file The tags in are valid. Tags should conform to JSP specifications.
- Make sure the Java code in the JSP file is valid. Java code should conform to Java syntax.
- Ensure that the EL expression in the JSP file is valid. EL expressions should conform to the EL specification.
- Make sure the JSTL tags in the JSP file are valid. JSTL tags should conform to JSTL specifications.
Problem 4: The JSP file cannot generate the correct HTML code
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <title>JSP Example</title> </head> <body> <h1 id="Hello-World">Hello World!</h1> </body> </html>
Solution:
- Make sure the HTML code in the JSP file is valid. HTML code should comply with HTML specifications.
- Make sure the CSS code in the JSP file is valid. CSS code should comply with CSS specifications.
- Make sure the JavaScript code in the JSP file is valid. JavaScript code should comply with JavaScript specifications.
Problem 5: The JSP file cannot generate the correct output
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
int a = 10;
int b = 20;
int c = a + b;
%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1 id="The-sum-of-a-and-b-is-c">The sum of (a) and (b) is (c).</h1>
</body>
</html>Solution:
- Make sure the Java code in the JSP file is valid. Java code should conform to Java syntax.
- Ensure that the EL expression in the JSP file is valid. EL expressions should conform to the EL specification.
- Make sure the JSTL tags in the JSP file are valid. JSTL tags should conform to JSTL specifications.
- Make sure the HTML code in the JSP file is valid. HTML code should comply with HTML specifications.
- Make sure the CSS code in the JSP file is valid. CSS code should comply with CSS specifications.
- Make sure the JavaScript code in the JSP file is valid. JavaScript code should comply with JavaScript specifications.
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