[hibernate-issues] [Hibernate-JIRA] Commented: (HV-443) Scope of ConstraintDescriptors sometimes wrong in type hierarchies

Scope of ConstraintDescriptors sometimes wrong in type hierarchies ------------------------------------------------------------------ Key: HV-443 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-443 Project: Hibernate Validator Issue Type: Bug Components: engine Affects Versions: 4.1.0.Final Reporter: Gunnar Morling Fix For: 4.2.0.CR1 Using the BV meta data API it is possible to retrieve meta information on the constraints of given Java types. Using the {{ConstraintFinder}} API the scope of the constraints to retrieve meta data for can be restricted. Due to the caching of meta data in {{BeanMetaDataCache}} it can happen under certain circumstances that constraints are declared in scope {{LOCAL_ELEMENT}}, although it should be {{HIERARCHY}} instead. The following test demonstrates the bug: {code:java} public class CacheTest { @Test public void constraintsFromSuperTypeAreInLocalScopeWhenSuperTypeIsLoadedFromCache() { Validator validator = Validation.buildDefaultValidatorFactory().getValidator(); // loads BeanMetaData for A and puts it into the BeanMetaDataCache PropertyDescriptor propertyDescriptorForSuperType = validator .getConstraintsForClass(A.class).getConstraintsForProperty("foo"); Set<ConstraintDescriptor<?>> constraintDescriptorsFromSuperType = propertyDescriptorForSuperType .findConstraints().lookingAt(Scope.LOCAL_ELEMENT) .getConstraintDescriptors(); assertEquals(constraintDescriptorsFromSuperType.size(), 1); // re-uses BeanMetaData for A from cache, keeps A's constraints in // LOCAL_ELEMENT scope PropertyDescriptor propertyDescriptorForSubType = validator .getConstraintsForClass(B.class).getConstraintsForProperty("foo"); Set<ConstraintDescriptor<?>> constraintDescriptorsFromSubType = propertyDescriptorForSubType .findConstraints().lookingAt(Scope.LOCAL_ELEMENT) .getConstraintDescriptors(); // fails assertEquals(constraintDescriptorsFromSubType.size(), 0, "No descriptor in LOCAL scope expected for B.foo"); } @Test public void constraintsFromSuperTypeAreInHierarchyScopeWhenSuperTypeIsNotLoadedFromCache() { Validator validator = Validation.buildDefaultValidatorFactory().getValidator(); // loads BeanMetaData for A when traversing B's hierarchy, A's constraints // are correctly in HIERARCHY scope PropertyDescriptor propertyDescriptorForSubType = validator .getConstraintsForClass(B.class).getConstraintsForProperty("foo"); Set<ConstraintDescriptor<?>> constraintDescriptorsFromSubType = propertyDescriptorForSubType .findConstraints().lookingAt(Scope.LOCAL_ELEMENT) .getConstraintDescriptors(); assertEquals(constraintDescriptorsFromSubType.size(), 0, "No descriptor in LOCAL scope expected for B.foo"); constraintDescriptorsFromSubType = propertyDescriptorForSubType .findConstraints().lookingAt(Scope.HIERARCHY) .getConstraintDescriptors(); assertEquals(constraintDescriptorsFromSubType.size(), 1, "One descriptor in HIERARCHY scope expected for B.foo"); } public static class A { @NotNull public String getFoo() { return null; } } public static class B extends A { } } {code} The bug is caused by retrieving the meta data for {{A}} from the cache when building the meta data for its sub-type {{B}} (see {{constraintsFromSuperTypeAreInLocalScopeWhenSuperTypeIsLoadedFromCache}}). In this case the constraint from {{A}} are added to {{B}} but remain in scope {{LOCAL_ELEMENT}}. The bug does not occur when the meta data for {{A}} is retrieved when traversing the type hierarchy while building up the meta data for {{B}} (see {{constraintsFromSuperTypeAreInHierarchyScopeWhenSuperTypeIsNotLoadedFromCache}}), though I guess the constraints would be wrongly in scope {{HIERARCHY}} if afterwards the descriptors for {{A}} itself would be retrieved. To fix this bug the constraint scope needs to be re-determined always if the meta data is retrieved from the cache.