While upgrading from hibernate2 to 3.6. I removed hibernate2 version jars but while starting server getting below exception.

Env : Java 1.7, Jboss, EJB3

Code : Class I18NDescriptionType implements CompositeUserType{
@Override
public Type[] getPropertyTypes() {
return new Type[]{Hibernate.STRING};
}
}

java.lang.NoSuchFieldError: STRING
at com.jda.portfolio.infrastructure.server.database.types.I18NDescriptionType.getPropertyTypes(I18NDescriptionType.java:43)
at org.hibernate.type.CompositeCustomType.getColumnSpan(CompositeCustomType.java:160)
at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:253)
at org.hibernate.mapping.Collection.validate(Collection.java:278)
at org.hibernate.mapping.IndexedCollection.validate(IndexedCollection.java:67)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1106)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1287)