About null

api-jdo

javax.jdo.JDOFatalException

This class represents exceptions that are fatal; that is, the condition that caused it cannot be bypassed even if the operation is retried.(Exception of JDO)

 
manual

Database Explorer

Explains how to run and use the ObjectDB object database Explorer to view and manage Java/JPA/JDO objects visually.... The Edit > Set Reference > Set to Null command is used to set a reference to null . The Edit > Set Reference > Set to Existing ...

 
api-jpa

javax.persistence.EntityManager

Interface used to interact with the persistence context.(Interface of JPA)

 
manual

Database Explorer

Explains how to run and use the ObjectDB object database Explorer to view and manage Java/JPA/JDO objects visually.... The Edit > Set Reference > Set to Null command is used to set a reference to null . The Edit > Set Reference > Set to Existing ...

 
api-jdo

javax.jdo.JDOUserException

This class represents user errors that can possibly be retried.(Exception of JDO)

 
api-jdo

javax.jdo.JDOFatalInternalException

This class represents errors in the implementation for which no user error handling is possible.(Exception of JDO)

 
forum_thread

Left join fetch behaviour doesn't retrieve children?

Hello support, I'm a little bit confused about a left join fetch behaviour. In this test case, i try to fetch my 3 children using a left join fetch. But my collection is null after closing the em. It was expected to be fetched before closing the em, no ? In fact, that is the objective of the fetch purpose (i guess ?). ... children using a left join fetch. But my collection is null after closing the em. It was expected to be fetched before closing ... ;   EntityManager em = null ;   // Merge parent1 em = emf. ...

 
forum_thread

DB Doctor sets type to "unknown" for new fields

Hi, we are using ObjectDB 2.5.4_04 on Linux. We added two new Boolean fields to a persistable type and run DB Doctor on the exiting DB file in order to update the schema. The fields are added to the schema as expected, however their type is set to unknown - we were expecting Boolean. The attached DB file is what was produced by DB Doctor after adding the emergency and broadcast fields. If you run in DB Explorer ... your report indicates an Explorer behavior of specifying null results as Unknown type, even when static field type can be used. By the ... updates like the following fail to change the value from null to false: UPDATE RecordingMetaData AS r SET r . ...

 
release

2.4.3

... clearing). Fixed the Explorer to show null values in primitive fields (unset values in new fields) correctly. ... Changed non loaded collections on detachment to null (rather than empty collections ). Fixed a critical bug ...

 
release

2.4.2

... clearing). Fixed the Explorer to show null values in primitive fields (unset values in new fields) correctly. ... Changed non loaded collections on detachment to null (rather than empty collections ). Fixed a critical bug ...