ClassCastException for EL in custom tag files

• Type: Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: 7.0.0 DXP FP17
• Fix Version/s: None
• Component/s: Portal Services > Component Management > Portlet Container
• Labels:
  • QA-TBD
• Fix Priority: 1

Using EL expression in custom tag file throws exception :

java.lang.ClassCastException: com.liferay.taglib.servlet.PageContextWrapper cannot be cast to org.apache.jasper.runtime.PageContextImpl
at org.apache.jasper.runtime.JspContextWrapper.getELContext(JspContextWrapper.java:327)
at org.apache.jasper.runtime.PageContextImpl.evaluateExpression(PageContextImpl.java:1012)
at org.apache.jsp.tag.web.demotags.sum_tag.doTag(sum_tag:74)
at org.apache.jsp.index_jsp._jspx_meth_d_sum_0(index_jsp:76)

index.jsp 

<%@taglib tagdir="/WEB-INF/tags/demotags" prefix="d" %>
Hello <d:sum a="1" b="4" />

sum.tag 

<%@tag pageEncoding="UTF-8" isELIgnored="false" body-content="empty" %>
<%@attribute name="a" type="java.lang.Long" %>
<%@attribute name="b" type="java.lang.Long" %>
and the result is ${a+b}.