Assuming that you are using HTTP, the arguments column reflects the query parameters on the URL - so, using the supplied examples that we have a GET on
http://localhost:8001/itkoExamples/EJB3UserControlBean?wsdl
would give an argument of "wsdl" and be shown as below:
{"id":0,"operation":"GET /itkoExamples/EJB3UserControlBean","arguments":{"wsdl":"wsdl"}}
and a post would reflect similar. If, however, there are no query parameters then there are no arguments to display. So, if you are passing your information in the body of the request then you will not see anything here.
Again, using our examples, a POST with the required information in the payload gives
Request {id=0, operation="POST /itkoExamples/EJB3UserControlBean", arguments=, attributes=HTTP-Segment-Attr-0=itkoExamples&HTTP-Segment-Attr-1=EJB3UserControlBean, metaData=HTTP-Method=POST&HTTP-URI=/itkoExamples/EJB3UserControlBean&HTTP-Version=1.1&Content-Type=text/xml; charset=utf-8&SOAPAction=""&User-Agent=Axis/1.4-LISA&lisaFrameRemoteIP=10.129.145.61&lisaFrameRoot=true&lisaFrameID=29554a60-e19d-11e7-ba8a-f01e3400359a&Content-Length=452&Host=localhost:8001&Connection=Keep-Alive&lisa.vse.request.client.id=127.0.0.1:51846, matchTolerance=Exact, binary=false, body=(non-binary)[452 bytes] <?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<soapenv:Body>
<addUser xmlns="http://ejb3.examples.itko.com/">
<!--username is optional-->
<username xmlns="">webapp-1809697074</username>
<!--password is optional-->
<password xmlns="">example-pwd</password>
</addUser>
</soapenv:B_TRUNCATED_
So, the question is, are you passing query parameters - in which case you will see arguments, or are you sending all of the data in the payload?