java.lang.LinkageError: loader constraints violated when linking oracle/sql/BfileDBAccess

Hi,

I get the following exception when I run a junit test for a class that talks to the database. The same code run
from a standalone java application runs fine without such exception. I found online postings of such
LinkageError for org.w3.Document class, but I did not find anything for oracle.sql.BfileDBAccess
class. Can you please suggest the solution to this problem?

java.lang.LinkageError: loader constraints violated when linking oracle/sql/BfileDBAccess class
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1610)
at java.lang.Class.getConstructor0(Class.java:1922)
at java.lang.Class.getConstructor(Class.java:1019)
at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:811)
at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:797)
at weblogic.rmi.extensions.StubFactory.getStub(StubFactory.java:79)
at weblogic.rmi.utils.io.RemoteObjectReplacer.resolveObject(RemoteObjectReplacer.java:237)
at weblogic.rmi.internal.StubInfo.readResolve(StubInfo.java:142)
at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:925)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1655)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at weblogic.common.internal.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:120)
at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:117)
at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:56)