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• entities,
• mapped superclasses,
• and embedded

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Configuration

A managed class will be included if it is one of the following:

• Local classes:
  • Local means that the classes are in the deployment unit where the persistence.xml file is packaged.
  • the classes must be annotated with the @Entity annotations
• Classes in mapping files
• Explicitly listed classes: the classes are listed as class elements in the persistence.xml file.

A managed class will be excluded if:

• it's listed in the exclude-unlisted-classes element of the persistence.xml.

Why ? In a certain context, you may want to exclude an entity in order to use it as a transfer object but not as entity.