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https://issues.apache.org/jira/browse/OPENJPA-2272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469223#comment-13469223
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Guillaume Chauvet commented on OPENJPA-2272:
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Hello Rick,
Thank you for your quick answer. I will replace EnumMap by an HashMap, for the
moment.
> Unable to instantiate proxy for type "java.util.EnumMap"
> --------------------------------------------------------
>
> Key: OPENJPA-2272
> URL: https://issues.apache.org/jira/browse/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")
> @MapKeyEnumerated
> 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 constructor.
> 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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