[hibernate-issues] [Hibernate-JIRA] Created: (HV-292) Provide a constraint annotation @ScriptAssert

[Gunnar Morling (JIRA)]

Provide a constraint annotation @ScriptAssert
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                 Key: HV-292
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-292
             Project: Hibernate Validator
          Issue Type: New Feature
          Components: validators
    Affects Versions: 4.1.0-Beta-1
            Reporter: Gunnar Morling
            Assignee: Hardy Ferentschik


Quite often the validation of one bean property depends on the value of another property of the same bean. In such case a custom class-level constraint and a corresponding validator have to be implemented.

This effort can be reduced by providing a generic class-level constraint, which allows to evaluate arbitrary script expressions based on the annotated class as in the following example:

@ScriptAssert(lang = "groovy", script = "_this.startDate.before(_this.endDate)")
public class CalendarEvent {

    private Date startDate;

    private Date endDate;

    //...
}

The blog post http://musingsofaprogrammingaddict.blogspot.com/2009/08/script-annotation-for-bean-validation.html describes, how such a constraint could be realized using the JSR 223 ("Scripting for the Java Platform") API.

In alternative to solely rely on JSR 223 it should be investigated, whether a more general approach could be taken to enable the integration of scripting/expression languages, for which no JSR 223 binding exists (e.g. Spring EL). This could be realized by providing a SPI mechanism, which allows to plug-in additional script engine providers.

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