添加到bpel中的列表

Question

我试图将一个元素附加到一个对象列表但我得到一个NullpointerException，有人可以帮助我。

                            <if name="If1">
                                <condition>1 = $addFlightCalled</condition>
                                <assign name="Assign">   <----- THIS IS WHERE I GET A NULLPOINTER
                                    <extensionAssignOperation>
                                        <bpelx:append>
                                            <bpelx:from>$tempFlight</bpelx:from>
                                            <bpelx:to>$Itenerary/flightBookings</bpelx:to>
                                        </bpelx:append>
                                    </extensionAssignOperation>
                                </assign>
                                <else>
                                    <assign name="Assign3">
                                        <copy>
                                            <from variable="tempFlight"/>
                                            <to>$Itenerary/flightBookings/FlightBookings</to>
                                        </copy>
                                    </assign>
                                </else>
                            </if>
...

有人可以帮助我。

Answer 1

                                                            $ Itenerary / NS0：航班/ NS0：FlightBookings [$ ForEach1Counter] / NS0：bookingNumber                                                                                                                                                                                                                                                                                                                                 $ CancelFlightIn.parameters /为arg0                                                                                                                                                                               $ Itenerary / NS0：航班/ NS0：FlightBookings [$ ForEach1Counter] / NS0：价格                                                                                                                                                                                                                                                                                                                                 $ CancelFlightIn.parameters / ARG1