Mapping Map<String,String> using Hibernate

Question

It seems that everywhere I look, there are outdated versions of this which no longer work. My problem seems really simple. I have a class in Java, which maps to a derby database. I'm using annotations, and have successfully managed to create all the other tables in my DB, yet with this specific example, where I just need a Map, which does not use any other class, just two simple string values. I have come across all types of errors trying everything I've found online.

Does anybody know of a simple way of doing this, without using deprecated annotations?

Thanks in advance!

Pwnstar · Accepted Answer · 2017-11-27 19:08:57Z

16

Chapter 2.2.5.3.4 of Hibernate Annotations documentation describes the necessary annotations. You need to do something like:

@Entity
public class MyEntity {
    ...

    @ElementCollection // this is a collection of primitives
    @MapKeyColumn(name="key") // column name for map "key"
    @Column(name="value") // column name for map "value"
    public Map<String,String> getMyMap() {

    ...
}

edited Nov 27, 2017 at 19:08

Pwnstar

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answered Aug 4, 2011 at 19:26

ChssPly76

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3 Comments

Jatin Sehgal Over a year ago

I used these annotations & made a separate entity for myMap. I am getting this error: Can not set java.lang.Long field AttributeValueRange.id to java.lang.String. What could be the problem here?

Tobb Over a year ago

I think it should be @MapKeyColumn and not @MapKey, the latter is used when the key is an attribute of the value.

Thierry Over a year ago

see stackoverflow.com/questions/3393649/… which gives the annotations on how to customize the collection table / columns name

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