To get my app running I had to bundle org.hibernate:hibernate-validator-legacy:4.0.2.GA with my app. It was provided on AS6, I think, but it's not available on AS7, apparently.
This might fix your problem.
It looks like I'm missing some really old class:
Caused by: java.lang.NoClassDefFoundError: org/hibernate/validator/InvalidValue
at java.lang.Class.getDeclaredMethods0(Native Method) [:1.6.0_24]
--
Skywalker:lib alesj$ jar -tf hibernate-validator-4.0.2.GA.jar
META-INF/
META-INF/MANIFEST.MF
META-INF/services/
META-INF/services/javax.validation.spi.ValidationProvider
META-INF/validation-configuration-1.0.xsd
META-INF/validation-mapping-1.0.xsd
org/
org/hibernate/
org/hibernate/validator/
org/hibernate/validator/constraints/
org/hibernate/validator/constraints/Email.class
org/hibernate/validator/constraints/impl/
org/hibernate/validator/constraints/impl/AssertFalseValidator.class
org/hibernate/validator/constraints/impl/AssertTrueValidator.class
org/hibernate/validator/constraints/impl/DecimalMaxValidatorForNumber.class
org/hibernate/validator/constraints/impl/DecimalMaxValidatorForString.class
org/hibernate/validator/constraints/impl/DecimalMinValidatorForNumber.class
org/hibernate/validator/constraints/impl/DecimalMinValidatorForString.class
org/hibernate/validator/constraints/impl/DigitsValidatorForNumber.class
org/hibernate/validator/constraints/impl/DigitsValidatorForString.class
org/hibernate/validator/constraints/impl/EmailValidator.class
org/hibernate/validator/constraints/impl/FutureValidatorForCalendar.class
org/hibernate/validator/constraints/impl/FutureValidatorForDate.class
org/hibernate/validator/constraints/impl/LengthValidator.class
org/hibernate/validator/constraints/impl/MaxValidatorForNumber.class
org/hibernate/validator/constraints/impl/MaxValidatorForString.class
org/hibernate/validator/constraints/impl/MinValidatorForNumber.class
org/hibernate/validator/constraints/impl/MinValidatorForString.class
org/hibernate/validator/constraints/impl/NotNullValidator.class
org/hibernate/validator/constraints/impl/NullValidator.class
org/hibernate/validator/constraints/impl/PastValidatorForCalendar.class
org/hibernate/validator/constraints/impl/PastValidatorForDate.class
org/hibernate/validator/constraints/impl/PatternValidator.class
org/hibernate/validator/constraints/impl/SizeValidatorForArray.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfBoolean.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfByte.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfChar.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfDouble.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfFloat.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfInt.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfLong.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfPrimitives.class
org/hibernate/validator/constraints/impl/SizeValidatorForArraysOfShort.class
org/hibernate/validator/constraints/impl/SizeValidatorForCollection.class
org/hibernate/validator/constraints/impl/SizeValidatorForMap.class
org/hibernate/validator/constraints/impl/SizeValidatorForString.class
org/hibernate/validator/constraints/Length.class
org/hibernate/validator/constraints/NotEmpty.class
org/hibernate/validator/constraints/Range.class
org/hibernate/validator/engine/
org/hibernate/validator/engine/ConfigurationImpl.class
org/hibernate/validator/engine/ConstraintTree$1.class
org/hibernate/validator/engine/ConstraintTree$ValidatorCacheKey.class
org/hibernate/validator/engine/ConstraintTree.class
org/hibernate/validator/engine/ConstraintValidatorContextImpl$ErrorBuilderImpl.class
org/hibernate/validator/engine/ConstraintValidatorContextImpl$InIterableNodeBuilderImpl.class
org/hibernate/validator/engine/ConstraintValidatorContextImpl$InIterablePropertiesBuilderImpl.class
org/hibernate/validator/engine/ConstraintValidatorContextImpl$NodeBuilderImpl.class
org/hibernate/validator/engine/ConstraintValidatorContextImpl.class
org/hibernate/validator/engine/ConstraintValidatorFactoryImpl.class
org/hibernate/validator/engine/ConstraintViolationImpl.class
org/hibernate/validator/engine/GlobalExecutionContext.class
org/hibernate/validator/engine/groups/
org/hibernate/validator/engine/groups/Group.class
org/hibernate/validator/engine/groups/GroupChain.class
org/hibernate/validator/engine/groups/GroupChainGenerator.class
org/hibernate/validator/engine/LocalExecutionContext.class
org/hibernate/validator/engine/MessageAndPath.class
org/hibernate/validator/engine/MessageInterpolatorContext.class
org/hibernate/validator/engine/NodeImpl.class
org/hibernate/validator/engine/PathImpl.class
org/hibernate/validator/engine/resolver/
org/hibernate/validator/engine/resolver/DefaultTraversableResolver.class
org/hibernate/validator/engine/resolver/JPATraversableResolver.class
org/hibernate/validator/engine/resolver/SingleThreadCachedTraversableResolver$1.class
org/hibernate/validator/engine/resolver/SingleThreadCachedTraversableResolver$TraversableHolder.class
org/hibernate/validator/engine/resolver/SingleThreadCachedTraversableResolver.class
org/hibernate/validator/engine/ResourceBundleMessageInterpolator$LocalisedMessage.class
org/hibernate/validator/engine/ResourceBundleMessageInterpolator.class
org/hibernate/validator/engine/ValidatorContextImpl.class
org/hibernate/validator/engine/ValidatorFactoryImpl.class
org/hibernate/validator/engine/ValidatorImpl.class
org/hibernate/validator/HibernateValidator.class
org/hibernate/validator/HibernateValidatorConfiguration.class
org/hibernate/validator/metadata/
org/hibernate/validator/metadata/AnnotationIgnores.class
org/hibernate/validator/metadata/BeanDescriptorImpl.class
org/hibernate/validator/metadata/BeanMetaData.class
org/hibernate/validator/metadata/BeanMetaDataCache.class
org/hibernate/validator/metadata/BeanMetaDataImpl.class
org/hibernate/validator/metadata/ConstraintDescriptorImpl$ClassIndexWrapper.class
org/hibernate/validator/metadata/ConstraintDescriptorImpl.class
org/hibernate/validator/metadata/ConstraintHelper.class
org/hibernate/validator/metadata/ConstraintOrigin.class
org/hibernate/validator/metadata/ElementDescriptorImpl$ConstraintFinderImpl.class
org/hibernate/validator/metadata/ElementDescriptorImpl.class
org/hibernate/validator/metadata/MetaConstraint$1.class
org/hibernate/validator/metadata/MetaConstraint.class
org/hibernate/validator/metadata/PropertyDescriptorImpl.class
org/hibernate/validator/util/
org/hibernate/validator/util/annotationfactory/
org/hibernate/validator/util/annotationfactory/AnnotationDescriptor.class
org/hibernate/validator/util/annotationfactory/AnnotationFactory.class
org/hibernate/validator/util/annotationfactory/AnnotationProxy$1.class
org/hibernate/validator/util/annotationfactory/AnnotationProxy.class
org/hibernate/validator/util/ContainsField.class
org/hibernate/validator/util/ContainsMethod.class
org/hibernate/validator/util/GetAnnotationParameter.class
org/hibernate/validator/util/GetClassLoader.class
org/hibernate/validator/util/GetConstructor.class
org/hibernate/validator/util/GetDeclaredField.class
org/hibernate/validator/util/GetDeclaredFields.class
org/hibernate/validator/util/GetDeclaredMethods.class
org/hibernate/validator/util/GetMethod.class
org/hibernate/validator/util/GetMethodFromPropertyName.class
org/hibernate/validator/util/GetMethods.class
org/hibernate/validator/util/IdentitySet.class
org/hibernate/validator/util/LazyValidatorFactory.class
org/hibernate/validator/util/LoadClass.class
org/hibernate/validator/util/LoggerFactory.class
org/hibernate/validator/util/NewInstance.class
org/hibernate/validator/util/ReflectionHelper.class
org/hibernate/validator/util/SetAccessibility.class
org/hibernate/validator/util/ValidatorTypeHelper.class
org/hibernate/validator/util/Version.class
org/hibernate/validator/ValidationMessages.properties
org/hibernate/validator/ValidationMessages_de.properties
org/hibernate/validator/ValidationMessages_fr.properties
org/hibernate/validator/xml/
org/hibernate/validator/xml/AnnotationType.class
org/hibernate/validator/xml/BeanType.class
org/hibernate/validator/xml/ClassType.class
org/hibernate/validator/xml/ConstraintDefinitionType.class
org/hibernate/validator/xml/ConstraintMappingsType.class
org/hibernate/validator/xml/ConstraintType.class
org/hibernate/validator/xml/ElementType.class
org/hibernate/validator/xml/FieldType.class
org/hibernate/validator/xml/GetterType.class
org/hibernate/validator/xml/GroupSequenceType.class
org/hibernate/validator/xml/GroupsType.class
org/hibernate/validator/xml/ObjectFactory.class
org/hibernate/validator/xml/package-info.class
org/hibernate/validator/xml/PayloadType.class
org/hibernate/validator/xml/PropertyType.class
org/hibernate/validator/xml/ValidatedByType.class
org/hibernate/validator/xml/ValidationBootstrapParameters.class
org/hibernate/validator/xml/ValidationConfigType.class
org/hibernate/validator/xml/ValidationXmlParser.class
org/hibernate/validator/xml/XmlMappingParser.class
META-INF/maven/
META-INF/maven/org.hibernate/
META-INF/maven/org.hibernate/hibernate-validator/
META-INF/maven/org.hibernate/hibernate-validator/pom.xml
META-INF/maven/org.hibernate/hibernate-validator/pom.properties
org/hibernate/validator/jtype/
org/hibernate/validator/jtype/ClassSerializer.class
org/hibernate/validator/jtype/ClassSerializers$1.class
org/hibernate/validator/jtype/ClassSerializers$2.class
org/hibernate/validator/jtype/ClassSerializers.class
org/hibernate/validator/jtype/ClassUtils.class
org/hibernate/validator/jtype/DefaultGenericArrayType.class
org/hibernate/validator/jtype/DefaultParameterizedType.class
org/hibernate/validator/jtype/DefaultTypeVariable.class
org/hibernate/validator/jtype/DefaultWildcardType.class
org/hibernate/validator/jtype/Generic$DefaultGeneric.class
org/hibernate/validator/jtype/Generic.class
org/hibernate/validator/jtype/Generics.class
org/hibernate/validator/jtype/Types.class
org/hibernate/validator/jtype/TypeUtils.class
org/hibernate/validator/jtype/Utils.class
META-INF/maven/com.googlecode.jtype/
META-INF/maven/com.googlecode.jtype/jtype/
META-INF/maven/com.googlecode.jtype/jtype/pom.xml
META-INF/maven/com.googlecode.jtype/jtype/pom.properties