Exception java.lang.object

[surf_er]

com.ejb.vas.service.CardTypeDataUnion

public final class CardTypeDataUnion implements java.io.Serialized
{
private java.lang.object _object;

CardType1(CardType1 _visc_disc)
{
_object = _visc_disc;
}

CardType1()
{
if (_disc.equal(com.ejb.vas.service.CardType1)){
return (com.ejb.vas.service.CardType1)_object;
}
}
};

When I return _object, I get the following error

Unspecified exception ......
stack strace is

The class invoking this routine is within the bean .jar and in the
server side. Any help....

The routine that call this class is as such.

GetCardType(_CardTypeData.union.CardType1().name);

The same works fine when IDL generates this code and implemented as
CORBA server. Infact this routes were generated by idl2java, we are
modifying to convert the idl's into EJB interface.

Surfer newton.