Tuesday, July 24, 2012

How to use Apache Axis2 for consuming a web service?

About the example:


In this example we will see how to use rather consume a web service using Apache Axis2. We have a Hello World web service which is already published, it accepts a String name and prints Hello name in return. To know more about how to publish a web service, click here.

Below are the steps which shows how to consume a web service using Apache Axis2

1. Download latest version of axis2 files from http://axis.apache.org/axis2/java/core/. (i.e. axis2-1.6.2-bin.zip).


2. Extract the folder (i.e. axis2-1.6.2) in your desire location. Lets assume as C:\axis2-1.6.2.

3. Add enviroment variable AXIS2_HOME and set the value "C:\axis2-1.6.2". Also make sure that JAVA_HOME is set in enviroment variables.

4. Now you can use wsdl2java.bat file from folder "C:\axis2-1.6.2\bin" to download web service stubs. Use command prompt and go to folder C:\axis2-1.6.2\bin and run below command.

   wsdl2java.bat -uri http://localhost:8080/SimpleWebservice/hellows?wsdl

   Note : Provide your wsdl URL in above command, you can also use XSD file instead of wsdl URL. Here we have already published a hello world web services. To know how to publish a simple hello world web service, click here.

   Please see the screen shot below.



5. If everything goes well in step 4, you will find a src folder downloaded in folder C:\axis2-1.6.2\bin. Now you can import the src folder in your eclipse workspace and add the JAR files from C:\axis2-1.6.2\lib in your classpath.



6. Create a class TestClient as shown below and see the output


/* TestClient.java */


package com.javaxp;


import java.rmi.RemoteException
import com.javaxp.HelloWSImplServiceStub.SayHello;
import com.javaxp.HelloWSImplServiceStub.SayHelloResponse;


public class TestClient {
public static void main(String[] args)  {
try {
HelloWSImplServiceStub service = new HelloWSImplServiceStub();
SayHello sh = new SayHello();
sh.setArg0("Madan");


SayHelloResponse shr = service.sayHello(sh);
System.out.println(shr.get_return());
} catch(RemoteException ex)  {
ex.printStackTrace();
}
}
}


Output:



Note: Below are the known error / exceptions faced while writing this example


1. log4j:WARN No appenders could be found for logger (org.apache.axis2.description.AxisOperation).
log4j:WARN Please initialize the log4j system properly.
org.apache.axis2.AxisFault: Couldn't create SOAP message due to exception: XML reader error: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,1]
Message: Premature end of file.
                at org.apache.axis2.util.Utils.getInboundFaultFromMessageContext(Utils.java:531)
                at org.apache.axis2.description.OutInAxisOperationClient.handleResponse(OutInAxisOperation.java:375)
                at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:421)
                at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
                at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
                at com.javaxp.HelloWSImplServiceStub.sayHello(HelloWSImplServiceStub.java:182)
                at com.javaxp.TestClient.main(TestClient.java:20)

2. log4j:WARN No appenders could be found for logger (org.apache.axis2.description.AxisOperation).
log4j:WARN Please initialize the log4j system properly.
org.apache.axis2.AxisFault: Couldn't create SOAP message due to exception: Unable to create StAX reader or writer
                at org.apache.axis2.util.Utils.getInboundFaultFromMessageContext(Utils.java:531)
                at org.apache.axis2.description.OutInAxisOperationClient.handleResponse(OutInAxisOperation.java:375)
                at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:421)
                at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
                at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
                at com.javaxp.HelloWSImplServiceStub.sayHello(HelloWSImplServiceStub.java:182)
                at com.javaxp.TestClient.main(TestClient.java:20)

3. log4j:WARN No appenders could be found for logger (org.apache.axis2.description.AxisOperation).
log4j:WARN Please initialize the log4j system properly.
org.apache.axis2.AxisFault: Software caused connection abort: recv failed
                at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
                at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:197)
                at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75)
                at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:404)
                at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:231)
                at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
                at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:406)
                at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
                at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
                at com.javaxp.HelloWSImplServiceStub.sayHello(HelloWSImplServiceStub.java:182)
                at com.javaxp.TestClient.main(TestClient.java:20)
Caused by: java.net.SocketException: Software caused connection abort: recv failed
                at java.net.SocketInputStream.socketRead0(Native Method)
                at java.net.SocketInputStream.read(SocketInputStream.java:129)
                at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
                at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
                at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78)
                at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106)
                at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116)
                at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.readLine(MultiThreadedHttpConnectionManager.java:1413)
                at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973)
                at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735)
                at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1098)
                at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
                at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
                at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
                at org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:621)
                at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:193)
                ... 9 more

4.  log4j:WARN No appenders could be found for logger (org.apache.axis2.description.AxisOperation).
log4j:WARN Please initialize the log4j system properly.
org.apache.axis2.AxisFault: Connection refused: connect
                at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
                at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:197)
                at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75)
                at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:404)
                at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:231)
                at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
                at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:406)
                at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
                at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
                at com.javaxp.HelloWSImplServiceStub.sayHello(HelloWSImplServiceStub.java:182)
                at com.javaxp.TestClient.main(TestClient.java:20)
Caused by: java.net.ConnectException: Connection refused: connect
                at java.net.PlainSocketImpl.socketConnect(Native Method)
                at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
                at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
                at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
                at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
                at java.net.Socket.connect(Socket.java:529)
                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
                at java.lang.reflect.Method.invoke(Method.java:597)
                at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:140)
                at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:125)
                at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
                at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
                at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
                at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
                at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
                at org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:621)
                at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:193)
                ... 9 more

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