Armin Waibel wrote:
Hi Jean-Yves,
jys wrote:
I'am getting trouble retrieving an instance of a class representing a
tree structure with ojb (last release), in the database the record is
good :
parentid id
name description
hJ}Tfk7o>#S[Om?\AP:X}T1y hJ}Tfk7o>#S[Om?\AP:X}T1y terre
<NULL> hJ}Tfk7o>#S[Om?\AP:X}T1y OK?`L_igc>JlU:m66mH^",@:
france <NULL> OK?`L_igc>JlU:m66mH^",@:
(ZjHVf">aQvtj%6H)$NC$7hl paris <NULL>
(ZjHVf">aQvtj%6H)$NC$7hl )f[u|G'za6-&!P]OUlp-=z>n toureiffel
<NULL> (ZjHVf">aQvtj%6H)$NC$7hl Wz:YyW,[EMAIL PROTECTED];A
bnf <NULL> Wz:YyW,[EMAIL PROTECTED];A
BWZ[_/i>Oq{Kj48VXBPOe.~& salle1 <NULL> So OJB was able to
persists it right.
But whem i'am trying to retrieve the structure, it's kind of messed
up, as "terre" wich is the root of the tree is the child of itself,
like that :
terre
terre france
......
Could you describe what's going wrong, does OJB throw an exception or
do you get a StackOverflowError?
I assume it can result in a StackOverflowError, because by default the
retrieve of the 1:1 reference is enabled and the 'root' object lookup
it's parent --> root, this itself will lookup the parent --> root ...
Could this be the problem?
I did a test with latest from CVS (OJB_1_0_RELEASE branch) setting a
object as parent object of itself. This test pass.
You're right it was the problem, just because has i set my root parent
to itself, it went back from OJB has a child of itself, the solution was
to set the root parent to null, this way i have to discard my not
nullable constaint on the parentid colum so it's not perfect but it's
working. The problem was not an exception being throwed but just the
root being a child of itself.
I don't know what i'am doing bad, but i tried to secure my getter and
setters so it's not possible to add a child which is the same object.
I was surprised to not get an exception, so i tried to add
breakpoints to all my getters and setters to see when OJB is calling
them, but
it never stop at my breakpoints. So how does OJB set the attributes
of the instances (my instances attributes are private) ? i really
don't get it.
This depends on the 'PersistentFieldClass' setting in OJB.properties
file. Per default OJB directly set the attributes of your persistent
objects.
http://db.apache.org/ojb/docu/guides/advanced-technique.html#Change+PersistentField+Class
That's really interesting, i do not knew that it was possible to bypass
private accessors like that, for those who are interested :
http://radio.javaranch.com/val/2004/05/18/1084891793000.html
> It's another unrelated question but i always get this error when
> starting my tests : is it normal ?
>
> org.apache.ojb.broker.platforms.PlatformPostgresImpl
> java.lang.ClassNotFoundException:
> org.apache.ojb.broker.platforms.PlatformPostgresImpl
> at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:242)
> at org.apache.ojb.broker.util.ClassHelper.getClass(Unknown Source)
> at org.apache.ojb.broker.util.ClassHelper.getClass(Unknown Source)
> at
> org.apache.ojb.broker.platforms.PlatformFactory.getPlatformFor(Unknown
Seems you specify a wrong 'platform' name in your
jdbc-connection-descriptor
> org.apache.ojb.broker.platforms.PlatformPostgresImpl
admittedly this class doesn't exist in OJB (the correct name is
PlatformPostgreSQLImpl). How did you set the platform attribute? The
allowed settings can be found here:
http://db.apache.org/ojb/docu/guides/repository.html#Attributes-N1013A
Example:
<jdbc-connection-descriptor
jcd-alias="default"
default-connection="true"
platform="PostgreSQL"
jdbc-level="2.0"
...
regards,
Armin
Thanks for your precious help.
Jean-Yves
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
