Eclipse doesn’t support this out the box. Even the support in JSP is very limited. Only the properties of <jsp:useBean> and managed beans hardcoded as <managed-bean> in faces-config.xml are available by autocomplete. There are however plugins which supports EL autocomplete on @ManagedBean and @Named beans. For example, the JBoss Tools plugin (specifically the CDI feature) … Read more
The expression ${foo} uses behind the scenes JspContext#findAttribute() which searches for attributes in PageContext, HttpServletRequest, HttpSession and ServletContext in this order by their getAttribute(“foo”) method whereby foo from ${foo} thus represents the attribute name “foo” and returns the first non-null object. So, if you do in a servlet ArrayList<Person> persons = getItSomehow(); request.setAttribute(“persons”, persons); // … Read more
Initial answer (EL 2.1, May 2009) As mentioned in this java forum thread: Basically autoboxing puts an Integer object into the Map. ie: map.put(new Integer(0), “myValue”) EL (Expressions Languages) evaluates 0 as a Long and thus goes looking for a Long as the key in the map. ie it evaluates: map.get(new Long(0)) As a Long … Read more
In Expression Language you can just use the == or eq operator to compare object values. Behind the scenes they will actually use the Object#equals(). This way is done so, because until with the current EL 2.1 version you cannot invoke methods with other signatures than standard getter (and setter) methods (in the upcoming EL … Read more
Yes, i have doctype in web.xml <!DOCTYPE web-app PUBLIC “-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN” “java.sun.com/dtd/web-app_2_3.dtd”; > Remove that <!DOCTYPE> from web.xml and make sure that the <web-app> is declared conform Servlet 2.4 or newer and all should be well. A valid Servlet 3.0 (Tomcat 7, JBoss AS 6-7, GlassFish 3, etc) compatible web.xml look … Read more
How can I validate if a String is null or empty using the c tags of JSTL? You can use the empty keyword in a <c:if> for this: <c:if test=”${empty var1}”> var1 is empty or null. </c:if> <c:if test=”${not empty var1}”> var1 is NOT empty or null. </c:if> Or the <c:choose>: <c:choose> <c:when test=”${empty var1}”> … Read more
You cannot invoke static methods directly in EL. EL will only invoke instance methods. As to your failing scriptlet attempt, you cannot mix scriptlets and EL. Use the one or the other. Since scriptlets are discouraged over a decade, you should stick to an EL-only solution. You have basically 2 options (assuming both balance and … Read more
Jun 2002: JSTL 1.0 was introduced with EL for first time. It were those ${} things which works in JSTL tags only. It is designed to call Javabean get methods. Nov 2003: JSP 2.0 was introduced and EL was moved from JSTL 1.0 to JSP 2.0 in javax.servlet.jsp.el package and it became standard EL as … Read more
First create a final class with a public static method which does exactly the job you want: package com.example; import java.util.Collection; public final class Functions { private Functions() { // Hide constructor. } public static boolean contains(Collection<Object> collection, Object item) { return collection.contains(item); } } Then define it as a facelet-taglib in /WEB-INF/functions.taglib.xml: <?xml version=”1.0″ … Read more
In standard EL prior to EL 2.2 from Java EE 6 you cannot directly invoke methods like #{bean.method()} nor invoke methods with arguments like #{bean.method(arg1, arg2). If upgrading to a EL 2.2 / Java EE 6 compliant container (Tomcat 7, Glassfish 3, JBoss AS 6, etc) is not an option and you’re currently using EL … Read more