JasperException: Attribute value is quoted with which must be escaped when used within the value

Caused by: org.apache.jasper.JasperException: /web/jsp/view.jsp(204,42) Attribute value pageContext.getAttribute("name").toString() is quoted with " which must be escaped when used within the value

org.apache.jasper.JasperException: /web/jsp/view.jsp(204,42) Attribute value pageContext.getAttribute("name").toString() is quoted with " which must be escaped when used within the value>org.apache.jasper.JasperException: /web/jsp/view.jsp(204,42) Attribute value pageContext.getAttribute("name").toString() is quoted with " which must be escaped when used within the value
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)

PROBLEM:
<a href="
<portlet:param name="node" value="<%=pageContext.getAttribute(\"parent_var\");%>"/>
">..</a>

https://issues.apache.org/bugzilla/show_bug.cgi?id=45015
==========
According to JSP 2.0 specification (chapter 1.7 page 72,73)

This code is illegal:
<mytags:tag value="<%= "hi!" %>" />

Instead the correct sentence would be:
<mytags:tag value='<%= "hi!" %>' />
<mytags:tag value="<%= \"hi!\" %>" />
<mytags:tag value='<%= \"name\" %>' />
==========

SOLUTION:
<a href="
<portlet:param name="node" value='<%=pageContext.getAttribute(\"parent_var\");%>'/>
">..</a>

MORE:
Можно также вывести значение атрибута на консоль
<a href="
<%System.out.println("EEEEEEEE = " + pageContext.getAttribute("parent_var")); %>
<portlet:param name="node" value='<%=pageContext.getAttribute(\"parent_var\");%>'/>
">..</a>