The following article describes how to debug a JSP page.

Debugging JSP (JavaServer Pages) pages can be challenging because JSPs are essentially a mix of HTML, Java code, and custom tags. The following list shows some techniques to help you debug a JSP page.

Debugging a JSP Page

  • Use the JSP compiler: Most JSP engines provide a JSP compiler that can help you identify syntax errors in your JSP page. By default, JSP engines will compile JSP pages on-the-fly when they are first requested by a client. However, you can usually configure your JSP engine to precompile JSP pages at startup or during deployment to identify any syntax errors.
  • Use System.out.println statements: You can add System.out.println statements to your JSP page to print out the values of variables or other information that can help you identify errors. These statements will output to the console or log file, depending on your JSP engine configuration.
  • Use a debugger: Most Java IDEs (Integrated Development Environments) have built-in debuggers that can help you step through your JSP code line-by-line and identify errors. You will need to configure your IDE to debug your JSP engine. This typically involves setting up a remote debugger and attaching it to your JSP engine process.
  • Use logging: You can use logging frameworks such as log4j or java.util.logging to log messages to a log file. This can help you identify errors in your JSP page and track down the source of the error.
  • Use browser developer tools: You can use browser developer tools, such as Chrome DevTools or Firefox Developer Tools, to inspect the HTML and JavaScript generated by your JSP page. This can help you identify errors in the HTML or JavaScript code that is generated by your JSP page.

In summary, debugging JSP pages requires a combination of techniques, including using the JSP compiler, adding System.out.println statements, using a debugger, using logging, and using browser developer tools. By using these techniques, you can identify and resolve errors in your JSP page.

Further Reading

Spring Framework Practice Problems and Their Solutions

Java Practice Exercise