Unable to find setter method for attribute: required

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What steps will reproduce the problem?
1. Create a jsp with struts2 jquery tag defined.
2. Add a date picker field like below:
<sj:datepicker id='accountEffectiveFromDate' name='accountEffectiveFromDate' 
parentTheme="xhtml" required="true" />
3. Run the jsp file in a web application.

What is the expected output? What do you see instead?
Expected result: A page with date picker displayed.
What I see instead: Error 500 on my page with the log below in my tomcat logs:

SEVERE: <JSP Error from /pages/security/managesystemuser.jsp> : 
org.apache.jasper.JasperException: /pages/security/managesystemuser.jsp (line: 
75, column: 44) Unable to find setter method for attribute: required
    at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
    at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443)
    at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:149)
    at org.apache.jasper.compiler.Generator$GenerateVisitor.evaluateAttribute(Generator.java:2882)
    at org.apache.jasper.compiler.Generator$GenerateVisitor.generateSetters(Generator.java:3106)
    at org.apache.jasper.compiler.Generator$GenerateVisitor.generateCustomStart(Generator.java:2276)
    at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1768)
    at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1538)

....

Which struts2 version?
2.3.24

Which struts2-jquery plugin version?
3.2.1

Please provide any additional information below.
I am using Java 8

Original issue reported on code.google.com by uchennan...@gmail.com on 17 Jul 2015 at 5:43

BIANEMohamed / struts2-jquery

Unable to find setter method for attribute: required #1134