[java] I can pass a variable from a JSP scriptlet to JSTL but not from JSTL to a JSP scriptlet without an error

The following code causes an error:

 <c:set var="test" value="test1"/>
 <%
   String resp = "abc";
   resp = resp + test;
   pageContext.setAttribute("resp", resp);
 %>
 <c:out value="${resp}"/>

The error says

"error a line 4: unknown symbol 'test'".

How do I pass test from the JSTL code to the JSP scriptlet?

@skaffman nailed it down. They live each in its own context. However, I wouldn't consider using scriptlets as the solution. You'd like to avoid them. If all you want is to concatenate strings in EL and you discovered that the + operator fails for strings in EL (which is correct), then just do:

<c:out value="abc${test}" />

Or if abc is to obtained from another scoped variable named ${resp}, then do:

<c:out value="${resp}${test}" />