It look like that you’re using JSTL 1.0 with taglib URIs of 1.1/1.2. You have JSTL in different versions: 1.0: exist of two JAR files jstl.jar and standard.jar. Taglib URI is has no /jsp in path and library name is suffixed with _rt like http://java.sun.com/jstl/core_rt. Came along and requires at minimum Servlet 2.3 / JSP … Read more
I had a similar problem, I am using Tomcat 10. I was getting this error using Apache NetBeans 12.3 IDE. I added the following libraries: jakarta.servlet.jsp.jstl-api-2.0.0.jar jakarta.servlet.jsp.jstl-2.0.0 (1).jar My code is running fine now. link to see where I added them
Look at the HttpServletResponse#sendRedirect(String location) method. Use it as: response.sendRedirect(request.getContextPath() + “/welcome.jsp”) Alternatively, look at HttpServletResponse#setHeader(String name, String value) method. The redirection is set by adding the location header: response.setHeader(“Location”, request.getContextPath() + “/welcome.jsp”);
A cookie is simply a short text string that is sent back and forth between the client and the server. You could store name=bob; password=asdfas in a cookie and send that back and forth to identify the client on the server side. You could think of this as carrying on an exchange with a bank … Read more
<c:if test=”${companies.size() > 0}”> </c:if> This syntax works only in EL 2.2 or newer (Servlet 3.0 / JSP 2.2 or newer). If you’re facing a XML parsing error because you’re using JSPX or Facelets instead of JSP, then use gt instead of >. <c:if test=”${companies.size() gt 0}”> </c:if> If you’re actually facing an EL parsing … Read more
If you want to use dynamic property names, use the brace notation. <c:forEach items=”${items}” var=”item”> ${item[propertyName]} </c:forEach>
You need to put the JSP file in /index.jsp instead of in /WEB-INF/jsp/index.jsp. This way the whole servlet is superflous by the way. WebContent |– META-INF |– WEB-INF | `– web.xml `– index.jsp If you’re absolutely positive that you need to invoke a servlet this strange way, then you should map it on an URL … Read more
The JSTL tags appear in the HTML source, this is not right. It is supposed to run in the server side, and disappear completely in the HTML output. This can happen if you didn’t declare the taglib in top of JSP. Add the following line to the top of your JSP to get the JSTL … Read more
The reason that you get the 404 File Not Found error, is that your path to CSS given as a value to the href attribute is missing context path. An HTTP request URL contains the following parts: http://[host]:[port][request-path]?[query-string] The request path is further composed of the following elements: Context path: A concatenation of a forward … Read more
Several reasons: Reusability: you can’t reuse scriptlets. Replaceability: you can’t make scriptlets abstract. OO-ability: you can’t make use of inheritance/composition. Debuggability: if scriptlet throws an exception halfway, all you get is a blank page. Testability: scriptlets are not unit-testable. Maintainability: per saldo more time is needed to maintain mingled/cluttered code logic. There are more, but … Read more