java - Struts2 regex validation issue with negative numbers -

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all, i'm attempting write should simple validation struts2 action. have field must contain 0 or positive integer, i'm attempting use struts2 built in regex validator accomplish this. regex i'm using '^\d*$', , i've tested outside of struts2 , believe should meet needs. (e.g. matches against '23', not 'abc' or '-5').

however, when use regex pattern in struts2, fails give me validation error negative numbers.

here's struts2 validation xml snippet:

<field name="editvo.capability.operationalqty">         <field-validator type="regex">             <param name="expression"><![cdata[^\d*$]]></param>          <message key="errors.number"/>          </field-validator> </field>

here of results i'm seeing when unit testing validation:

input  validation passes?  expected result? 23          yes            yes  abc         no             yes -5          yes            no  %5          no             yes  5-          no             yes  a5          no             yes

as can see results above, when run unit test (or test through app), error message (as expected) when enter 'abc' or '5-', '-5' not trigger validation failure. have no idea why it's allowing '-' character through if it's first character.

i'd appreciate struts2 related regex tips; please note believe error here somehow related struts2 , how handles regex, , not regex-only issue. (fwiw - i'm getting same issue when try pattern too: '^[0-9]*$'). 

<field-validator type="regex">

this field validator, requires field of action set work, not work against request. it's functionality provided validation interceptor.

for confirmation of see source (it isn't bad):

the validation interceptor defined in struts-default.xml such:

<interceptor name="validation" class="org.apache.struts2.interceptor.validation.annotationvalidationinterceptor"/>

org.apache.struts2.interceptor.validation.annotationvalidationinterceptor

the annotationvalidationinterceptor extends com.opensymphony.xwork2.validator.validationinterceptor

it opening javadoc validationinterceptor following:

/**  * <!-- start snippet: description -->  *  * interceptor runs action through standard validation framework, in turn checks action against  * validation rules (found in files such <i>actionclass-validation.xml</i>) , adds field-level , action-level  * error messages (provided action implements {@link com.opensymphony.xwork2.validationaware}). interceptor  * 1 of last (or second last) interceptors applied in stack, assumes values have  * been set on action.

and pretty sums up.

i think test cases explained type conversion alone. suspect params removing field error, not make sense validation errors kept if field value has been reset.

in conclusion: there nothing wrong struts2 regex validation, @ least when used in intended way.


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