[#COR-663] Object vanishes when another object is saved to db

db4o Core

Object vanishes when another object is saved to db

Created: 29/May/07 02:25 PM Updated: 18/Jul/08 02:57 PM

Component/s:

Local

Affects Version/s:

None

Fix Version/s:

None

Time Tracking:

Original Estimate:

Not Specified

Remaining Estimate:

Not Specified

Time Spent:

0.33h

File Attachments:

AdapterTest.java (5 kb)
2.

AdapterTest.java (4 kb)

Environment:

db4o 6.1, jdk 5, setup as for bug: ~~COR-662~~

Issue Links:

Related

This issue is related to:

~~COR-662~~ ClassCastException on Objectcontainer.set() for db4o adapter for gigaspaces

Resolution Date:	02/Jun/07 02:40 PM
First Response Date:	30/May/07 01:44 PM
Labels:
Participants:	Richard Liang, Rodrigo B. de Oliveira and Vidyadhar Nirantar
Number of Attachments:	2
Number of Comments:	4

Description

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A FieldNames object vanishes from the database after another PersistentEntry object is set.

The problem needs the same setup as for bug: http://tracker.db4o.com/browse/COR-662

A simple test program (AdapterTest.java) is attached. Just debug through the
AdapterTest#save() method. Place 2 breakpoints at positions highlighted in the test program.
Check contents of the db using ObjectManager at the two breakpoints.
The FieldNames object, that was earlier saved, is not seen later.

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Vidyadhar Nirantar - 29/May/07 02:25 PM

Test case attachment

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Richard Liang - 30/May/07 01:44 PM

Assist Persistent with Greg

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Rodrigo B. de Oliveira - 02/Jun/07 02:37 PM

Modified version that dumps FieldNames instances to stdout for easy checking.

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Rodrigo B. de Oliveira - 02/Jun/07 02:40 PM

I cannot reproduce the described behavior. I have attached a modified version of AdapterTest which dumps all FieldNames instances to stdout at the indicated source locations.

I get the following output:

<Output>

NO FieldNames in DB
02/06/2007 11:34:30 com.j_spaces.sadapter.GenericPA.Db4oPersistentAdapter initContext
INFO: END InitContext()
02/06/2007 11:34:30 com.j_spaces.sadapter.GenericPA.Db4oPersistentAdapter createClassTable
INFO: Class SA_DIRECTORY table created
02/06/2007 11:34:30 com.j_spaces.sadapter.GenericPA.Db4oPersistentAdapter insert
INFO: ***** Entered insert() SA_DIRECTORY
PUT A BRKPOINT HERE. CHECK FIELDNAMES OBJECT IN DB USING OBJECT MANAGER
*** DUMP BEGIN ***
[com.j_spaces.sadapter.GenericPA.FieldNames@228a02]
*** DUMP END ***
fvalues len 1 names len 1
02/06/2007 11:34:30 com.j_spaces.sadapter.GenericPA.Db4oPersistentAdapter insert
INFO: Insertion of SA_DIRECTORY successfull
PUT A BRKPOINT HERE AND CHECK AGAIN USING OBJECT MANAGER. IT HAS VANISHED
*** DUMP BEGIN ***
[com.j_spaces.sadapter.GenericPA.FieldNames@228a02]
*** DUMP END ***
*** DUMP BEGIN ***
[com.j_spaces.sadapter.GenericPA.FieldNames@228a02]
*** DUMP END ***
02/06/2007 11:34:30 com.j_spaces.sadapter.GenericPA.Db4oPersistentAdapter closeContext
INFO: Database Closed

</Output>

The FieldNames instance with identity 228a02 has clearly not vanished.