Skip to main content

Deploying Web Service in Apache AXIS2

The purpose of this article is to talk about how to write web service and deploy it in Apache AXIS2.

First step is downloading and installing apache axis2. There are two ways to use Apache AXIS2.

1. Install AXIS2 as a standalone server using the Standard Binary Distribution.
2. Deploy axis2.war and deploy it in a servlet container.

We will be using the 2nd method in the article. To check the installation open the url http://localhost:8080/axis2 and you should be able to see the home page of apache axis2.

Please locate the folder axis2\WEB-INF\services in exploded war file of axis2. This is the folder where you will copy the code of your service and it will get deployed in apache axis2.

Lets us take a simple example. Write your service class.

public class HelloWorld
{
public String sayHello(String firstName, String lastName)
{
System.out.println("Hello World Invoked");
MessageContext incomingContext = MessageContext.getCurrentMessageContext();
FileDataSource dataSource = new FileDataSource("c:/YServer.txt");
DataHandler dataHandler = new DataHandler(dataSource);
incomingContext.addAttachment("contentID", dataHandler);

String data = DataProvider.getData();
return "Hello " + firstName + " " + lastName + " " + data;
}
public String getServiceName()
{
return "test service";
}
}

Write a services.xml file.

<service>
<description>
This is my first service, which says hello
</description>
<parameter name="ServiceClass">HelloWorld</parameter>
<operation name="sayHello">
<messageReceiver class="org.apache.axis2.rpc.receivers.RPCMessageReceiver"/>
</operation>
<operation name="getServiceName">
<messageReceiver class="org.apache.axis2.rpc.receivers.RPCMessageReceiver"/>
</operation>
</service>

In case you want to receive the SOAP payload as XML Message in the service you need to specify XML Message receiver instead of RPCMessageReceiver in services.xml file. To specify XML Message receiver put the following line as child of <operation> tag in your services.xml.

<messageReceiver

class="org.apache.axis2.receivers.RawXMLINOutMessageReceiver"/>

Also, since the service will receive XML Message as input parameter you need to change the signature of the method of service.

public OMElement sayHello(OMElement element)

OMElement object contains the XML Message, OMElement Object is provided by AXIOM. AXIOM stands for AXis Object Model (also known as OM - Object Model) and refers to the XML infoset model that was initially developed for Apache Axis2.


Bundle your class file, services.xml in the hierarchy as shown in the figure below. See helloworld folder in image below.



Copy your service into the services folder of axis2 as shown in figure, start web server. Open the URL http://localhost:8080/axis2.

On the displayed page Click on services, you should be able to see the name of service you specified in services.xml in the list of web services.

Comments

Popular posts from this blog

Drools - An overview

For Java based applications the most challenging part has always been the business logic maintenance, and pick any applications which you find complex and if we ask ourself how complex it would be moving forward, the answer will always be nX times.

What do we do ? Drools comes for Rescue as a Rule Engine.

Drools provides mechanism:

a. To write business logic in simple english language
b. Easy to maintain and very simple to extend
c. Reusability of logic by defining keywords in a DSL file and using them in DSLR file.

But be careful nothing comes free, everything takes cost in terms of memory and time space.

Use Drools if you really have :

a. Business logic which you think is getting cluttered with multiple if conditions because of variety of scenarios
b. You will have growing demand of increase in the complexity
c. The business logic changes would be frequent (1 - 2 times a year would also be frequent)
d. Your server's have enough of memory as it is a memory hungary tool, it provi…

Java 8 streams performance on mathematical calculations

Java 8 Streams API supports many parallel operations to process the data, it abstracts low level multithreading logic. To test performance did following simple test to calculate factorial of first X number starting with N.

Following program calculates factorial of first 1000 numbers.

package com.java.examples; import java.math.BigInteger; import java.time.Duration; import java.time.Instant; import java.util.ArrayList; import java.util.List; publicclassMathCalculation { publicstaticvoid main(String[] args) { List<Runnable> runnables = generateRunnables(1, 1000); Instant start= Instant.now(); // Comment one of the lines below to test parallel or sequential streams runnables.parallelStream().forEach(r -> r.run()); // runnables.stream().forEach(r -> r.run()); Instant end = Instant.now(); System.out.println("Calculated in "+ Duration.between(start, end)); } privatestaticvoid factorial(int number) { int i; BigInteger fact = BigInteger.valueOf(1); for (i =1; i <= numb…

MQTT : Android step by step guide using Eclipse Paho

For MQTT integration, recently explored Paho Android project, very simple to use, here are the steps:

Intialize a client, set required options and connect.

    MqttAndroidClient mqttClient = new MqttAndroidClient(BaseApplication.getAppContext(), broker, MQTT_CLIENT_ID);
    //Set call back class
    mqttClient.setCallback(new MqttCallbackHandler(BaseApplication.getAppContext()));
    MqttConnectOptions connOpts = new MqttConnectOptions();
    IMqttToken token = mqttClient.connect(connOpts);


Subscribe to a topic.

    token.setActionCallback(new IMqttActionListener() {
      @Override
      public void onSuccess(IMqttToken arg0) {
           mqttClient.subscribe("TOPIC_NAME" + userId, 2, null, new IMqttActionListener() {
                @Override
                public void onSuccess(IMqttToken asyncActionToken) {
                    Log.d(LOG_TAG, "Successfully subscribed to topic.");
                }

                @Override
                public void onFailure…