jsp Archives - Page 3 of 3

What does request.getParameter return?

// index.jsp <form method="post" action="backend.jsp"> <input type="text" name="one" /> <input type="submit value="Submit" /> </form> In backend.jsp what does request.getParameter(“one”); return? request.getParameter("one").getClass().getName(); returns java.lang.String, ...

April 8, 2022
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What is the difference between response.sendRedirect() and request.getRequestDispatcher().forward(request,response)

To simply explain the difference, response.sendRedirect("login.jsp"); doesn’t prepend the contextpath (refers to the application/module in which the servlet is bundled) but, whereas request.getRequestDispathcer("login.jsp").forward(request, ...

April 6, 2022
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java.lang.NumberFormatException: null i

Here i come up with problem while performing some operation like update,delete and insert but its return some null value with exception kindly ...

April 6, 2022
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org.apache.jasper.JasperException: Unable to compile class for JSP:

Hi I’m trying to compile a simple jsp file with tomcat but I kept having this error message org.apache.jasper.JasperException: Unable to compile class ...

April 5, 2022
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WebServlet cannot be resolved to a type

April 5, 2022
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How to solve the “failed to lazily initialize a collection of role” Hibernate exception

If you know that you’ll want to see all Comments every time you retrieve a Topic then change your field mapping for comments to: @OneToMany(fetch = FetchType.EAGER, mappedBy ...

April 4, 2022
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What does this expression language ${pageContext.request.contextPath} exactly do in JSP EL?

The pageContext is an implicit object available in JSPs. The EL documentation says The context for the JSP page. Provides access to various ...

April 4, 2022
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how to fix Cannot call sendRedirect() after the response has been committed?

you have already forwarded the response in catch block: RequestDispatcher dd = request.getRequestDispatcher("error.jsp"); dd.forward(request, response); so, you can not again call the : ...

April 4, 2022
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Response has aready been committed

Firstly, the problem is not in the JSP or JS in your example1. The problem is in what your servlet does when it ...

April 4, 2022
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What is the difference between JSF, Servlet and JSP?

JSP (JavaServer Pages) JSP is a Java view technology running on the server machine which allows you to write template text in client side languages ...

April 4, 2022
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