The RestPlugin contains the following @Path annotation:

@Path("/{id:[0-9][0-9]*}")

irrespective of the type of the JPA Entity @Id field.

Even among the basic @Id types deemed supported by the Rest plugin, having any of the decimal types like float and double, or String, as the type of the @Id field in the JPA entity would result in generation of an incorrect REST resource.

The regex should preferably be context-sensitive and contain a different regex for different @Id types, or be omitted altogether.