[WW-4167] Unable to create a custom validator inheriting IntRangeFieldValidator

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.3.15.1
• Fix Version/s: 2.3.20
• Component/s: XML Validators

Environment

Windows 7 64bit, Java Runtime Environment 7, Tomcat 7
CentOS 5 32bit, Java Runtime Environment 6, Tomcat 6

• Assignee: Lukasz Lenart
• Reporter: recyclebin5385
• Created: 03/Aug/13 07:16
• Updated: 13/Jan/15 11:58
• Resolved: 11/Jul/14 20:22

Description

I created a custom struts validator class which inherits IntRangeFieldValidator, but a runtime error occurs when checking a input value with the validator.
When I examined the internal data with a debugger, properties "min" and "max" of the custom class were stored as Strings, not Integers.

Parameters "min" and "max" are read from [ActionName]-validation.xml, converted to Integers, and set to the properties of a validator instance using OGNL.
But the conversion to Integers is skipped for a derived class of IntRangeFieldValidator.
The cause seems to be a bug in OGNL library. See https://issues.apache.org/jira/browse/OGNL-238.
Methods setMin and setMax's argument types are the type parameter T in AbstractRangeValidator<T>.
OGNL library handles the type parameter for a directly derived class of a generic class, but not for an indirectly derived one.

A workaround is to override all getters and setters with a parameterized class in a custom validator class without using a type parameter.
That is, when I define a class which extends IntRangeFieldValidator, I have to also define methods "Integer getMin()", "void setMin(Integer min)", "Integer getMax()" and "void setMax(Integer max)" in the class.