Category Archives: Без рубрики

You can disable EL evaluation in a JSP page by setting the isELIgnored attribute to true in the page directive. ✅ Syntax: This tells the JSP engine to treat ${…} as plain text, not as an EL expression. EL will … Continue reading →

When you use EL (${…}) in JSP, there are special implicit objects available automatically inside the EL context. ✅ These are different from the classic JSP implicit objects (request, response, session, etc.) you use in Java code inside JSP. 🔵 … Continue reading →

In EL (${ … }), you can use many types of operators — very similar to Java, but slightly simplified. Here’s the full organized list: 🔵 1. Arithmetic Operators Operator Description Example + Addition ${2 + 3} → 5 – … Continue reading →

JSP Expression Language (EL) is a simple and powerful way to access Java objects in JSP pages without writing Java code (no <% %> needed). It allows you to access request attributes, session attributes, application attributes, JavaBeans properties, collections, and … Continue reading →

✅ Yes, it is technically possible to define a Java class inside a JSP page. You can do it inside a JSP declaration tag: <%! … %>. This code will be inserted into the servlet class that the JSP engine … Continue reading →

1. 🧹 Mixing Java Code with HTML = Messy and Hard to Maintain When you write Java code directly inside JSP (inside <% … %> blocks),you mix two completely different concerns: Presentation (HTML) Business logic (Java code) Result: Pages become … Continue reading →

Initialization parameters are name–value pairs that are passed to the JSP/servlet when the server loads it. There are two ways to configure them: 🔵 1. Using web.xml (Traditional way) You can define JSP initialization parameters inside the web.xml file of … Continue reading →

PageContext is an implicit object available in JSP that acts like a central manager for everything on a JSP page. Think of it as a super helper object that provides: Access to all the other scopes (page, request, session, application) … Continue reading →

👉 The exception object is NOT available in a regular JSP page. Object Available in regular JSP? Notes request ✅ Yes Always response ✅ Yes Always session ✅ Yes Always application ✅ Yes Always out ✅ Yes Always config ✅ … Continue reading →

📜 Implicit Objects in JSP Implicit Objects are automatically created by the JSP container and available to you inside a JSP page without any declaration. You don’t need to create them — they just exist! Here’s the list: Object Type … Continue reading →