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From "recyclebin5385 (JIRA)" <j...@apache.org>
Subject [jira] [Created] (WW-4167) Unable to create a custom validator inheriting IntRangeFieldValidator
Date Sat, 03 Aug 2013 07:17:48 GMT
recyclebin5385 created WW-4167:
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             Summary: 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


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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