RE: [OJB-developers] recursive dependency with ODMG

[Matthew B. <ma...@so...>]

 I can confirm this bug, we have Class A, B, C:
A references B, B references C, and C references A. Same result of endless
loop and overflow :(

A test case would be great. I'm going to look at the cause when I get a few
moments.

-----Original Message-----
From: Joa...@tp...
To: obj...@li...
Sent: 5/7/02 8:10 AM
Subject: [OJB-developers] recursive dependency with ODMG

Hy,

We're having a problem with recursive Dependencies with ODMG. We got a 
Class A and a Class B, Class A has a reference to a object of Class B
and 
vice versa. when two objects a (of type A) and b (of type B) reference 
each other ODMG gets caught in an endless loop and finally throws a 
StackOverFlow-Error... the first few lines of the stack-trace follow:

java.lang.StackOverflowError
        at java.util.Properties.getProperty(Properties.java:480)
        at java.lang.System.getProperty(System.java:574)
        at 
sun.security.action.GetPropertyAction.run(GetPropertyAction.java:66)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.io.Converters.getDefaultEncodingName(Converters.java:66)
        at java.lang.StringCoding.decode(StringCoding.java:224)
        at java.lang.String.<init>(String.java:380)
        at org.gjt.mm.mysql.Buffer.readLenString(Unknown Source)
        at org.gjt.mm.mysql.MysqlIO.getResultSet(Unknown Source)
        at org.gjt.mm.mysql.MysqlIO.sqlQueryDirect(Unknown Source)
        at org.gjt.mm.mysql.Connection.execSQL(Unknown Source)
        at org.gjt.mm.mysql.PreparedStatement.executeQuery(Unknown
Source)
        at 
ojb.broker.accesslayer.JdbcAccess.materializeObject(JdbcAccess.java:327)
        at ojb.broker.singlevm.PersistenceBrokerImpl.getDBObject(Unknown

Source)
        at 
ojb.broker.singlevm.PersistenceBrokerImpl.getObjectByIdentity(Unknown 
Source)
        at ojb.odmg.ObjectEnvelope.setInitialModificationState(Unknown 
Source)
        at ojb.odmg.ObjectEnvelope.<init>(Unknown Source)
        at ojb.odmg.TransactionImpl.register(Unknown Source)
        at ojb.odmg.TransactionImpl.lock(Unknown Source)
        at ojb.odmg.TransactionImpl.lockReferences(Unknown Source)
        at ojb.odmg.TransactionImpl.register(Unknown Source)
        at ojb.odmg.TransactionImpl.lock(Unknown Source)

(Don't know yet why ojb.odmg is "Unknown Source", I'll have to find
out). 
I don't know if I'm trying to do something that's not possible with ODMG

(in which case I think we should throw the correct Exception) or if it's
a 
simple bug.

I will probably be able to provide a small test case by tomorrow, if 
needed.

regards
Joachim Sauer

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