The attached testcase is copied from
https://github.com/hibernate/hibernate-orm/blob/4.3.6.Final/hibernate-entitymanager/src/test/java/org/hibernate/jpa/test/convert/CollectionElementConversionTest.java

with 2 changes:
1. Change autoApply to false at @Converter for ColorTypeConverter
2. Add @Convert(converter=ColorTypeConverter.class) to Set<ColorType> colors

org.hibernate.MappingException: Could not determine type for: ConvertTest$ColorType, at table: cust_color, for columns: [org.hibernate.mapping.Column(color)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:336)
at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:310)
at org.hibernate.mapping.Collection.validate(Collection.java:315)
at org.hibernate.mapping.Set.validate(Set.java:40)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1362)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1849)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1928)