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java.lang.NullPointerException: null	at weblogic.xml.query.types.XQueryAtomicType.commonSuperTypeOf(XQueryAtomicType.java:150)	at weblogic.xml.query.types.XQueryType.comparisonTypeOf(XQueryType.java:324)	at weblogic.xml.query.runtime.compare.GeneralAtomicComparison.compare(GeneralAtomicComparison.java:50)	at weblogic.xml.query.runtime.compare.ComparisonIterator.fetchNext(ComparisonIterator.java:50)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.logic.BoolEffValue.exec(BoolEffValue.java:51)	at weblogic.xml.query.runtime.logic.BoolEffValue.fetchNext(BoolEffValue.java:47)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.core.IfThenElse.fetchNext(IfThenElse.java:79)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.core.CountMapIterator.fetchNext(CountMapIterator.java:162)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.core.CountMapIterator.fetchNext(CountMapIterator.java:162)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.sequences.Exists.fetchNext(Exists.java:40)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.core.IfThenElse.fetchNext(IfThenElse.java:79)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.core.LetIterator.fetchNext(LetIterator.java:133)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.core.LetIterator.fetchNext(LetIterator.java:133)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.querycide.QueryAssassin.fetchNext(QueryAssassin.java:54)	at weblogic.xml.query.iterators.GenericIterator.peekNext(GenericIterator.java:151)	at weblogic.xml.query.runtime.qname.InsertNamespaces.fetchNext(InsertNamespaces.java:161)	at weblogic.xml.query.iterators.GenericIterator.next(GenericIterator.java:113)	at weblogic.xml.query.runtime.core.QueryIterator.fetchNext(QueryIterator.java:127)	at weblogic.xml.query.iterators.GenericIterator.hasNext(GenericIterator.java:134)	at weblogic.xml.query.xdbc.util.Serializer.serializeItems(Serializer.java:142)	at com.bea.ld.server.QueryInvocation.getResult(QueryInvocation.java:461)	at com.bea.ld.EJBRequestHandler.executeFunction(EJBRequestHandler.java:346)	at com.bea.ld.ServerBean.executeFunction(ServerBean.java:108)