Struts validation could be a pain. This how-to should help.
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How to enable struts validation:
Make sure you have the following:
1) ApplicationResources.properties file with keys/values for standard
validators (at least - errors.required)
2) struts-config.xml file should contain the reference to this resource file
for message-resources node.
3) struts-config plug-in node should contain validator Plugin
className="org.apache.struts.validator.ValidatorPlugIn"
4) The plugin should have set-property with name pathnames that corresponds
to validator files (such as /WEB-INF/validator-rules.xml and
/WEB-INF/validation.xml)
5) Action Validation vs. Form Validation. Alternative solutions:
Solution A:
- Form Validation: validation.xml should contain form with name
that corresponds to form-bean name in struts-config.
- Form Bean or its Parent should inherit
org.apache.struts.validator.ValidatorForm class
Solution B (povides more flexibility):-
- Form Validation: validation.xml should contain form with name that
corresponds to actions path name in struts-config.
- Form Bean or its Parent should inherit org.
apache.struts.validator.ValidatorActionForm.
6) The form should have a field with property that corresponds to field name
we want to validate. Nested properties are okay.
7) This field should have a 'depends' attribute that corresponds to the
validator name mentioned in /WEB-INF/validator-rules.xml (i.e. 'required')
8) This field should have an arg0 node with attribute key that corresponds to
existing key in application resource file
9) in action-mapping: 'input' attribute of action should reference to jsp
page with validated form and validate should be set to true.
12) jsp page should contains <html:errors /> (or its substitute)
File Compatibility:
1) Make sure the validation-rules.xml and commons-validator.jar match.
The xml version and jars implementation version need to be compatible
2) Make sure your struts.jar version is compatible with the
commons-validator.jar
3 ) Compabitly issues will usually result in validation not working and no
errors or warnings to trace the problem. To avoid issues, simply do not attempt
to reuse other's validation.xml, validation-rules.xml, and
commons-validator.jar files. Only use files that are packaged with your struts
distribution zip/tar file.
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