i encounter NullPointerException when run the axis2 sample ,pls help me . the stack detail is :
Exception in thread "main" java.lang.NullPointerException at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:578) at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:328) at org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAxisOperation.java:279) at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:457) at org.apache.axis2.client.ServiceClient.sendReceive(ServiceClient.java:399) at com.boldly.axis.EchoBlockingClient.main(EchoBlockingClient.java:43)
