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1. JPA @Enumerated Error    stackoverflow.com

I have a Entity with a field which I want to be an Enum. 

@Column(name = "TEMPRATURE_ZONE")
@Enumerated(STRING)
private TemperatureRegime tempratureZone;
The Enum is defined as follows: 
public enum TemperatureRegime {
    AMBIENT,
 ...

2. jaxws and EclipseLink refuses to use enums from lib    stackoverflow.com

This might sound like a basic question, but I really don't understand why what I'm facing is a problem. I have a maven multimodule project with a ejb with a webservice, ...

3. JPA Enum ORDINAL vs STRING    stackoverflow.com

Its is possible to define enumerations in JPA either using 

@Enumerated(EnumType.ORDINAL)
or 
@Enumerated(EnumType.STRING)
I wonder what are advantages and disadvantages of those two definitions? I heard that ORDINAL performs better (is faster) than STRING with ...