Troubleshooting java.lang.AbstractMethodError in portlet development
问题 I'm having this issue while developing portlets: Caused by: javax.servlet.ServletException: java.lang.AbstractMethodError: javax.servlet.jsp.PageContext.getELContext()Ljavax/el/ELContext; I don't know anymore, what I can do. My portlet set-up is as follows: in web.xml: <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" in my jsp: <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> I also have some Maven dependencies in the POM file including portlet-api 2.0, jsp-api 2.1