Design Patterns , Java - udemy

What you'll learn
Learn java server pages
Learn design patterns
Learn java
Learn Factory design pattern
Requirements
Learn everything you need to know
Description
When you write code in JSP, you can make some errors while writing lines of code. These errors can be classified into different types. But some errors occur when the code is not logically accurate or an internal error from the system. The concept of handling exceptions to JSP is similar to Java, where exceptions are managed using try-catch blocks. In this tutorial, you will learn about the concept of handling exception in JSP.Exceptions can be defined as an object that is thrown during a program run. Exception handling is the practice of handling errors at runtime. Exceptions can occur at any time in a web application. Therefore, the web developer must handle exceptions to be on the safe side and make the user work flawlessly on the web.The exception Implicit ObjectAn exception implicit object is implemented to handle exceptions to display error messages.The exception implicit object is an instance of the java.lang.Throwable class.It is only available for JSP pages, with the isErrorPage value set as "True". This means Exception objects can only be used in error pages.Types of Exceptions in JSPThere are three types of exceptions in JSP; these are:Checked ExceptionRuntime ExceptionErrors ExceptionLet us now discuss each of them in detail.Checked Exceptions"Checked exceptions" are a type of exception that is usually a user fault or a problem that cannot be foreseen by the programmer. This type of exception is checked at compile-time. Here is a list of some common "Checked exceptions" that occur in the programming...

Read more

Continue reading...