In Axis2, it is not mandatory to have a service implementation class for a given Web service. The Axis2 architecture allows us to write Web services without having a service implementation class.
This is simply because the message receiver allows us to do so. With Axis2, once the request is handed over to the message receiver, Axis2 thinks the AxisEngine that it has finished its job and it's up to the message receiver to do the rest. Therefore, there is no special XML element for specifying the service implementation class in the services.
If we do have a service implementation class most of the time we do , then we can add a special parameter called ServiceClass into the services. Then the value of the parameter should be the full qualified name of the service class. So if the full qualified name of the service implementation is org. Foo, then we could add the following parameter into the services. Message receiver is a special handler in Axis2, and it is the last handler in the In path Request path.
Each and every operation in a service has its own message receivers, and the type of message receiver may differ from one operation to another. Take the scenario where we want to use the same message receiver for all the operations in a given service.
We can easily do that by adding service level message receivers. In this case, we do not need to specify a message receiver at the operation level. What we need to do is to add the operation tag along with the name and the MEP to which it belongs.
Then, at deployment, the correct Message receivers will be set for the operations in the services. There may be some instances where we cannot run our service without engaging the WS-Security module into the service. Engaging a module is just a matter of adding a module tag into the services.
If the module is available then the engaging will take place, else it will make our service a faulty service. So if we want to engage a module called foo, then we can add the module element into the services. There are four service session scopes available in Axis2 to deploy our service.
If we do not specify the session scope, then the service will be deployed using the default session scope - the request session scope. To specify the scope, you must add an optional attribute to the service element, so the value of the attribute can be one of the four sessions listed below:. The idea of a service target namespace is only applicable for WSDL generation.
At runtime, if someone tries to view the WSDL for a given service using? So the solution is to add the target namespace value into the services. To specify a target namespace, you must add an optional attribute called targetNamespace. At deployment, if we do not specify a schema target namespace, then the target namespace will be calculated using the package name of the service implementation class. For example, if the full qualified name of the service implementation class is org.
FooService then the schema namespace will be,. If you want to provide your own value for that, you can do that by adding the following element into the services. There are situations where we do not need this behavior and we want to set the value of elementFormDefault to Unqualified. The correct way of registering observers should as follows:. The description of services are specified using services. Each service archive file needs to have a services. A very simple services. Scope is of several types- "application", "soapsession", "transportsession", "request".
The default value if you don't enter any value will be "request". ServiceLifeCycle class is useful when you want to do some tasks when the system starts and when it shuts down. This value will be used when generating the WSDL. If you do not specify this value, the value will be calculated from the package name of the service impl class. Description : Optional If you want to display any description about the service via Axis2 web-admin module, then the description can be specified here.
If the transport element is not present, then the service will be exposed in all the transports available in the system. The transport child element specifies the transport prefix the name of the transport specified in axis2. There is a compulsory parameter in services. This class is loaded by the MessageReceiver.
If the user wants to override it, he has to add the "operation" tag and override it. In a non-Java scenario or if you do not have a service class, then all the operations the user wants to expose by the service has to be indicated in the services.
It is specified as follows:. The only compulsory attribute here is "name", which represents the operation name that is going to be exposed. Any operation can contain module references as well as any number of parameters. The most interesting thing is that you can register custom message receivers per operation. Then the registered message receiver will be the message receiver for the corresponding operation.
If you do not specify the message receiver, then the default message receiver will perform the operation. The first two sections of the user guide explain how to write and deploy a new Web Service using Axis2, and how to write a Web Service client using Axis2. The next section - Configuring Axis2 - provides an introduction to important configuration options in Axis2. The final section - Advanced Topics - provides references to other features.
In this first section, we will learn how to write and deploy Web services using Axis2. Please deploy axis2. The Installation Guide gives you step-by-step instructions on just how to build axis2.
The following section explains how to start from a WSDL, and create a new service with code generation. However, if you are a new user, it is better to follow the code generation approach first given below. As you might already know, a WSDL description of a service provides a precise definition of that web service. Axis2 can process the WSDL and generate java code that does most of the work for you.
At the server side, we call them Skeletons, and at the client side, Stubs. This tool is located in the bin directory of the distribution and can be executed using the provided scripts. The tool's parameter list can be found in the Axis2 Reference Document.
The parameters for the wsdl2java tool in our example are as follows. Please note that, for this example, we are using xmlbeans as the data binding framework, and the generated code will be placed in a "samples" directory.
Note that these are not source files and should be available in the class path in order to compile the generated classes. Now you should fill the business logic in the skeleton class.
Let's fill the echoString.. An Axis2 service must be bundled as a service archive. The next step is to package the classes in an. There is an ant file generated with the code; it will generate the Axis2 service archive for you. However, if you do not want to use ant, you can create an archive with the following steps :. To write your own service. The service can be deployed by simply dropping the ". We recommend using Apache Tomcat as the servlet container. Please Note that the services directory is available only after axis2.
However, the easiest way to do it is to start Tomcat after axis2. See the Web Administration Guide for more information. However, if you are a new user, we recommend using the code generation approach presented below. Let's see how we could generate java code Stub to handle the client side Web Service invocation for you.
This will generate client side stubs and xmlbeans types for your types.
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