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copied!<p>I'm surprised this isn't available out of the box. Anyway, here is a possible solution.</p> <p>I've created a class level validator, not the field level as described in the original question.</p> <p>Here is the annotation code:</p> <pre class="lang-java prettyprint-override"><code>package com.moa.podium.util.constraints; import static java.lang.annotation.ElementType.*; import static java.lang.annotation.RetentionPolicy.*; import java.lang.annotation.Documented; import java.lang.annotation.Retention; import java.lang.annotation.Target; import javax.validation.Constraint; import javax.validation.Payload; @Target({TYPE, ANNOTATION_TYPE}) @Retention(RUNTIME) @Constraint(validatedBy = MatchesValidator.class) @Documented public @interface Matches { String message() default "{com.moa.podium.util.constraints.matches}"; Class<?>[] groups() default {}; Class<? extends Payload>[] payload() default {}; String field(); String verifyField(); } </code></pre> <p>And the validator itself:</p> <pre class="lang-java prettyprint-override"><code>package com.moa.podium.util.constraints; import org.mvel2.MVEL; import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext; public class MatchesValidator implements ConstraintValidator<Matches, Object> { private String field; private String verifyField; public void initialize(Matches constraintAnnotation) { this.field = constraintAnnotation.field(); this.verifyField = constraintAnnotation.verifyField(); } public boolean isValid(Object value, ConstraintValidatorContext context) { Object fieldObj = MVEL.getProperty(field, value); Object verifyFieldObj = MVEL.getProperty(verifyField, value); boolean neitherSet = (fieldObj == null) && (verifyFieldObj == null); if (neitherSet) { return true; } boolean matches = (fieldObj != null) && fieldObj.equals(verifyFieldObj); if (!matches) { context.disableDefaultConstraintViolation(); context.buildConstraintViolationWithTemplate("message") .addNode(verifyField) .addConstraintViolation(); } return matches; } } </code></pre> <p>Note that I've used MVEL to inspect the properties of the object being validated. This could be replaced with the standard reflection APIs or if it is a specific class you are validating, the accessor methods themselves.</p> <p>The @Matches annotation can then be used used on a bean as follows:</p> <pre class="lang-java prettyprint-override"><code>@Matches(field="pass", verifyField="passRepeat") public class AccountCreateForm { @Size(min=6, max=50) private String pass; private String passRepeat; ... } </code></pre> <p>As a disclaimer, I wrote this in the last 5 minutes, so I probably haven't ironed out all the bugs yet. I'll update the answer if anything goes wrong.</p>

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