CODEWITHSUNDEEP
javahibernatejpa
Roalt
Roalt

Reputation: 8440

Persist a Map<Integer,Float> with JPA

What's the best way to persist the following map in a class:

  @Entity
  class MyClass {


      @ManyToMany(cascade = CascadeType.ALL)    
      Map<Integer,Float> myMap = new HashMap<Integer, Float>(); 
  }

I've tried this, but the code results in:

Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: mypackage.myClass.myMap[java.lang.Float]

Upvotes: 5

Views: 2771

Answers (1)

axtavt
axtavt

Reputation: 242686

You cannot use @ManyToMany with Integer and Float because these types are value types, not entities. Use @ElementCollection (since Hibernate 3.5) or @CollectionOfElements (in previous versions).

@ElementCollection
Map<Integer,Float> myMap = new HashMap<Integer, Float>();

See also:

Upvotes: 9

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