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From "Guillaume Chauvet (JIRA)" <>
Subject [jira] [Created] (OPENJPA-2272) Unable to instantiate proxy for type "java.util.EnumMap"
Date Wed, 03 Oct 2012 14:52:07 GMT
Guillaume Chauvet created OPENJPA-2272:

             Summary: Unable to instantiate proxy for type "java.util.EnumMap"
                 Key: OPENJPA-2272
             Project: OpenJPA
          Issue Type: Bug
    Affects Versions: 2.2.0
            Reporter: Guillaume Chauvet

Dear OpenJPA team,

I have defined a EnumMap collection field like this :

@OneToMany(cascade = CascadeType.ALL, mappedBy = "settings")
@MapKeyColumn(name = "ENUMKEY")
private Map<FilterType, Ponderation> ponderations = new EnumMap<FilterType, Ponderation>(FilterType.class);

Generated tables are okay but when I launch my unit test I obtain this message :
<openjpa-2.2.0-r422266:1244990 fatal store error> org.apache.openjpa.persistence.RollbackException:
Unable to instantiate proxy for type "java.util.EnumMap".  Make sure the class has a default

I understand OpenJPA needs collections with default constructor, but EnumMap needs the enum
type as parameter. This means the EnumMap collection is not usable ?

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