Accessing a JSTL / EL variable inside a Scriptlet

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JSTL variables are actually attributes, and by default are scoped at the page context level.
As a result, if you need to access a JSTL variable value in a scriptlet, you can do so by calling the getAttribute() method on the appropriately scoped object (usually pageContext and request). 

resp = resp + (String)pageContext.getAttribute("test");

Full code 

 <c:set var="test" value="test1"/>
 <%
    String resp = "abc"; 
    resp = resp + (String)pageContext.getAttribute("test");   //No exception.
    out.println(resp);
  %>

But why that exception come to me.

A JSP scriptlet is used to contain any code fragment that is valid for the scripting language used in a page. The syntax for a scriptlet is as follows:

<%
   scripting-language-statements
%>

When the scripting language is set to Java, a scriptlet is transformed into a Java programming language statement fragment and is inserted into the service method of the JSP page’s servlet.

In scriptlets you can write Java code and ${test} in not Java code.

Not related

  • How to avoid Java Code in JSP-Files?

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