About mapped superclass

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@MappedSuperclass and @Transient not working as I expected

so there are no tables, but indeed a mapped superclasses (as well as abstract entity classes) do not store data just ... for the superclass, and the transient field would not appear in any table. The actual result is that there is a table for the superclass.  When I try to examine it in ObjectDB Explorer, it throws a NPE
JPA Doc
2

javax.persistence.metamodel.MapAttribute

javax.persistence.metamodel Interface MapAttribute Superinterfaces: AttributeMap>, Bindable, PluralAttributeMap,V> Instances of the type MapAttribute represent persistent java.util.Map-valued attributes. Since: JPA 2.0 Class getBindableJavaType() Return the Java type
JPA Doc
2

javax.persistence.spi.PersistenceProvider

EntityManagerFactory createContainerEntityManagerFactory( PersistenceUnitInfo info, Map map) Called by ... when an EntityManagerFactory is to be created. Parameters: info - metadata for use by the persistence provider map - a Map of integration-level properties for use by the persistence provider (may be null
JDO Doc
2

getPersistenceCapableSuperclass()

Method javax.jdo.spi.RegisterClassEvent Class getPersistenceCapableSuperclass() Returns the class object of the persistence-capable superclass. Returns: the persistence-capable superclass. Since: JDO 1.0
JDO Doc
2

getPersistenceCapableSuperclass(pcClass)

Method javax.jdo.spi.JDOImplHelper Class getPersistenceCapableSuperclass(   Class pcClass ) Get the persistence-capable superclass for a PersistenceCapable class. Parameters: pcClass - the PersistenceCapable class. Returns: The PersistenceCapable superclass for this class, or null if there isn't one. Since: JDO 1.0
JDO Doc
2

javax.jdo.identity.ByteIdentity

IOException, ClassNotFoundException Read this object. Read this object. Read the superclass first ...  out) Write this object. Write this object. Write the superclass first. Parameters: out - the output
JDO Doc
2

javax.jdo.identity.CharIdentity

this object. Read this object. Read the superclass first. Parameters: in - the input Since: JDO 1.0 String ... this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0 void readExternal
JDO Doc
2

javax.jdo.identity.IntIdentity

, ClassNotFoundException Read this object. Read this object. Read the superclass first. Parameters: in - the input ... this object. Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0
JDO Doc
2

javax.jdo.identity.LongIdentity

, ClassNotFoundException Read this object. Read this object. Read the superclass first. Parameters: in ... this object. Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1
JDO Doc
2

javax.jdo.identity.ObjectIdentity

, ClassNotFoundException Read this object. Read this object. Read the superclass first. Parameters: in - the input ... the superclass first. Parameters: out - the output Since: JDO 1.0 void readExternal(ObjectInput arg0)throws