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About mapped superclass

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JDO Doc
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writeExternal(out)

Method javax.jdo.identity.ObjectIdentity void writeExternal(   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0
JDO Doc
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writeExternal(out)

Method javax.jdo.identity.ShortIdentity void writeExternal(   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0
JDO Doc
1

writeExternal(out)

Method javax.jdo.identity.StringIdentity void writeExternal(   ObjectOutput out ) Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0
Issue
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Doctor bug?

to the object hierarchy, where I inherit from a common superclass, which I annotated as you suggested (in ... . There was a problem in handling a mapped super class with no primary key, and that caused
Forum
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EmbeddedId with Generated field value

the common IDs from a common super entity class / mapped superclass. It's a good suggestion. But this way
JDO Doc
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addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameters)

 candidateCollectionExpression,   Map parameters ) Add a subquery to this query. The Map version of the method treats the key of each map entry as the name of the parameter in the subquery, with or ... expression is the empty String for either the parameter or the value of the String[], or for any map key
JPA Doc
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AssociationOverride.joinColumns

) being mapped to the persistent attribute(s). The joinColumns elements must be specified if a foreign key mapping is used in the overriding of the mapping of the relationship. The joinColumns element must not be specified if a join table is used in the overriding of the mapping of the relationship. Default value: {} Since: JPA 1.0
JDO Doc
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javax.jdo.annotations.Key

for the key of a map relation. Corresponds to the xml element "key". Since: JDO 2.1 String column Name ... : "" Since: JDO 2.1 Embedded[] embeddedMapping The embedded mapping for the key. The embedded mapping for the key. Returns: the embedded mapping for the key Default value: {} Since: JDO 2.1 Extension[] extensions
JDO Doc
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javax.jdo.annotations.Value

for the value of a map relation. Corresponds to the xml element "value". Since: JDO 2.1 String column ... : whether this value is embedded Default value: "" Since: JDO 2.1 Embedded[] embeddedMapping The embedded mapping for the value. The embedded mapping for the value. Returns: the embedded mapping for the value Default
JPA Doc
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javax.persistence.criteria.Subquery

) Create a subquery map join object correlated to a map join object of the enclosing query. Create a subquery map join object correlated to a map join object of the enclosing query. Parameters