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https://issues.apache.org/jira/browse/WW-4167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13729515#comment-13729515
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recyclebin5385 commented on WW-4167:
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Avoiding the problem is easy, so there is no problem as far as the developer
has enough knowledge about the structure of the validator and carefully writes
a custom validator.
But if a developer who wants to write his own custom validator doesn't know
about this, he has no way to avoid the problem and he will spend some time to
investigate why his validator does't work as expected.
> Unable to create a custom validator inheriting IntRangeFieldValidator
> ---------------------------------------------------------------------
>
> Key: WW-4167
> URL: https://issues.apache.org/jira/browse/WW-4167
> Project: Struts 2
> Issue Type: Bug
> Components: XML Validators
> Affects Versions: 2.3.15.1
> Environment: Windows 7 64bit, Java Runtime Environment 7, Tomcat 7
> CentOS 5 32bit, Java Runtime Environment 6, Tomcat 6
> Reporter: recyclebin5385
> Priority: Minor
> Fix For: 2.3.x
>
>
> 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.
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