JDev10.1.2: Difference betwn same oracle.jbo.classes in different jar files

Hello guys, does somebody knows the difference between these two JDeveloper 10.1.2 directories?
JDEV_HOME/BC4J/lib
JDEV_HOME/BC4J/jlib
And more deeply, why are there different jar files both containing classes like oracle.jbo.domain.Number and oracle.jbo.domain.Date? I explain: you can find oracle.jbo.domain.Number in JDEV_HOME/BC4J/lib/bc4jdomorcl.jar and in JDEV_HOME/BC4J/jlib/bc4jdomgnrc.jar ?
This is very strange.
I ran into trouble because both oracle.jbo.domain.Number classes where being loaded, I was importing into my project the BC4J Generic Domains library which points to the BC4J/jlib/bc4jdomgnrc.jar, so I took it off of my project and added the BC4J/lib/bc4jdomorcl.jar as an additional path in the classpath because this is the one referenced by the embedded OC4J in the application.xml file.
Thank you.

Refer to the section BC4J Runtime Libraries
If you are using the Oracle type mappings, use bc4jdomorcl.jar. If the application was built using "Java" type mapping, use bc4jdomgnrc.jar which is located in <jdev_install>/bc4j/jlib.
http://213.35.38.54/otn_hosted_doc/jdeveloper/904preview/packaging_deploying/dbc_pldlibsappsvr.html

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thanks for your reply.
sorry if forgot to mention that how i am using this java code.
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JDev10.1.2: Difference betwn same oracle.jbo.classes in different jar files

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