org.hibernate.MappingException：无法确定类型：java.util.List，在表：Schedule_assignedRoles，对于列：assignedRoles

org.hibernate.MappingException: Could not determine type for: java.util.List, at table: Schedule_assignedRoles, for columns: assignedRoles

我需要帮助，我正在尝试使用地图，但出现了以下错误：

Caused by: org.hibernate.MappingException: Could not determine type for: java.util.List, at table: Schedule_assignedRoles, for columns: [org.hibernate.mapping.Column(assignedRoles)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:390)
at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:363)
at org.hibernate.mapping.Collection.validate(Collection.java:310)
at org.hibernate.mapping.IndexedCollection.validate(IndexedCollection.java:74)
at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:333)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:443)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:802)

号

这里是我的代码：

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@Entity
public class Schedule extends PersistentObject implements Comparable<Schedule> {
private String title;

@ManyToOne
private Agent target;

@ElementCollection
@MapKeyColumn(nullable = false)
@Column(nullable = false)
private Map<Long, List<Role>> assignedRoles = new HashMap<>();

//gets e setters
}

谢谢！D