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< Scout‎ | Tutorial‎ | 3.9‎ | webservices
(New page: {{ScoutPage|cat=Tutorial 3.9}} == Abstract == This tutorial is a guide to developing [http://jax-ws.java.net/ JAX-WS] webservices in [http://www.eclipse.org/scout/ Eclipse Scout]. JAX-WS s...)
 
(Resources)
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== Resources ==
 
== Resources ==
The completed projects for this tutorial can be downloaded from our SVN at [https://dev.eclipse.org/svnroot/technology/org.eclipse.scout/scout.example/branches/3.8/jaxws].  
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The completed projects for this tutorial can be downloaded from our SVN at [https://github.com/BSI-Business-Systems-Integration-AG/org.eclipse.scout.example/raw/3.8/jaxws].  
  
 
In order to run the tutorial you need to have the Derby database installed on your system. A ready-to-go database can be downloaded from [https://github.com/BSI-Business-Systems-Integration-AG/org.eclipse.scout.example/raw/3.8/jaxws/org.eclipse.scout.tutorial.jaxws.database/database/org.eclipse.scout.tutorial.jaxws.database.zip]. Alternatively, the database can be created from scratch by using the SQL script [https://github.com/BSI-Business-Systems-Integration-AG/org.eclipse.scout.example/raw/3.8/jaxws/org.eclipse.scout.tutorial.jaxws.database/script/create_database.sql]. [[{{BASEPAGENAME}}/Setup Derby database|Learn more]] on how to setup the derby database from scratch.
 
In order to run the tutorial you need to have the Derby database installed on your system. A ready-to-go database can be downloaded from [https://github.com/BSI-Business-Systems-Integration-AG/org.eclipse.scout.example/raw/3.8/jaxws/org.eclipse.scout.tutorial.jaxws.database/database/org.eclipse.scout.tutorial.jaxws.database.zip]. Alternatively, the database can be created from scratch by using the SQL script [https://github.com/BSI-Business-Systems-Integration-AG/org.eclipse.scout.example/raw/3.8/jaxws/org.eclipse.scout.tutorial.jaxws.database/script/create_database.sql]. [[{{BASEPAGENAME}}/Setup Derby database|Learn more]] on how to setup the derby database from scratch.

Revision as of 04:24, 2 April 2013


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Abstract

This tutorial is a guide to developing JAX-WS webservices in Eclipse Scout. JAX-WS stands for Java API for XML Web Services. The JAX-WS version supported by Eclipse Scout is JAX-WS RI 2.1.6 bundled with Java SE 6. We are not using the lastest version (such as JAX-WS RI 2.2.5) because we encountered a lot of problems in having a newer version aside the Java built-in internal JAX-WS RI 2.1.6 implementation.

The scope of this tutorial is to create a simple Scout application with a webservice consumer and a webservice provider installed. The application will load company data from a Derby database and allow the user to request a company's stock price with a 20 minute delay from the public StockQuoteService. Also, a webservice will be published to access the application's company data from within another application.

Resources

The completed projects for this tutorial can be downloaded from our SVN at [1].

In order to run the tutorial you need to have the Derby database installed on your system. A ready-to-go database can be downloaded from [2]. Alternatively, the database can be created from scratch by using the SQL script [3]. Learn more on how to setup the derby database from scratch.

Requirements

For this tutorial to work, you will have to use a JDK (Java Development Kit).

Also, if you have multipe JDK versions installed, make sure you use the same version in your workspace as you use to run Eclipse itself. To check this go to 'Window' | 'Preferences' | 'Java' | 'Installed JREs'. In the list on the right hand side ensure that only one version is listed and that this version matches the one that the running Eclipse is using.

During this tutorial we will analyze and edit WSDL files. To do this in a convenient way we need to install the Eclipse WSDL editor if not already installed. To check this go to 'Help' | 'About Eclipse' and press the 'Installation Details' button. On the next dialog switch to the 'Features' tab and check if there exists an entry named 'Eclipse XML Editors and Tools' (column 'Feature Name') [4]. If this entry exists, the WSDL Editor is already installed and you can jump to the next section. Otherwise continue with the following steps:

1. Go to 'Help' | 'Install New Software...'.
2. Select the 'Juno' updatesite from the 'Work with' listbox.
3. Under the category 'Web, XML, Java EE and OSGi Enterprise Development' check 'Eclipse XML Editors and Tools'.
4. Click next, next, read and accept the license and press finish.
5. After the download and the installation has been completed restart Eclipse and the WSDL Editor has been installed successfully.


Installed JREs.png

Go to 'Window' | 'Preferences'. Click on 'Java' | 'Installed JREs' and make sure, that a jdk-version is installed. Choose the jdk-version and click on 'Edit...'. Check, if there is a file named 'tools.jar'. If it does not, click on 'Add External JARs...' and choose the file 'tools.jar'.

Preliminary work

First of all, you have to create a new Scout project.

Afterwards, create a Derby SQL Service to access company data and to persist webservice log entries.

In order to display data from the database, create a Company Table Page.

To display stock quote information for a company, create a Company Form.

To track webservice requests, they are logged into the database for this tutorial. This is why a WS Log Table Page and WS Log Form are to be created.

Ensure JAX-WS support is enabled for your project

In order to have JAX-WS support available in the project, select the project node 'org.eclipse.scout.tutorial.jaxws' in the Scout Explorer. In the Scout Object Properties scroll to the 'Technologies' section and ensure the checkbox 'Webservices with JAX-WS RI 2.1.6' is enabled. If not yet checked, enable the technology and confirm the popup dialog with 'Ok'.

If JAX-WS support is enabled correctly you should see the 'Webservices (JAX-WS RI 2.1.6)' under the server node in the Scout Explorer. [5]

Create Webservice Consumer

On server node, go to the node 'Webservices (JAX-WS RI 2.1.6)' | 'Consumer' | 'Services'. Right-click on that node to create a new webservice consumer [6]. In the first wizard step, choose the 2nd option WSDL FROM URL and enter the URL to the WSDL file of the stock quote service provider [7]. In the course of this tutorial this would be http://services.nexus6studio.com/StockQuoteService.asmx?wsdl. By pressing TAB or clicking somewhere outside the URL field, the WSDL file is evaluated. If this is about a valid WSDL file, click Finish to create the webservice consumer. Click here to learn more about webservice consumer creation. In case you encounter problems to build the webservice stub, refer to the Console Output for more information. Please find the created webservice consumer StockQuoteServiceSoapWebServiceClient in Scout Explorer [8]. In the Scout Property View of this consumer, you can access the various files such as the WSDL file or the service type. Also, there you find links to rebuild the webservice stub, to change build properties for stub generation process, to edit binding customization files and more. Also, the authentication mechanism can be changed in the section Authentication. For more information on that Property View, please click here.

Next, we have to configure the endpoint URL of the webservice which is http://services.nexus6studio.com/StockQuoteService.asmx. For the sake of convenience, we hard-code this URL by specifying the property URL in the Property View [9]. In real life, this would be done in config.ini to distinguish the different systems such as development, integration and production.

Integrate Webservice Consumer in application

Finally, the webservice is ready to be used by our tutorial application. Open the process service CompanyProcessService and follow the two steps described below:

 Add data conversion methods
 Because data provided by the webservice is only of the type xsd:string, we have to convert them to their corresponding types.
 Please add the following conversion methods to your service.
 
 Click here to get the source.
 Please note: use java.util.Date for the Date class and not e.g. java.sql.Date!
 Change load-method to access webservice
 We have to change the implementation of CompanyProcessService#load(CompanyFormData) to access the stock quote webservice and include quote information for that company in the FormData.
 Please change the service's implementation as following:
 
 Click here to get the source

Finally, if you launch the application, you should see something like this:

Org.eclipse.scout.jaxws.tutorial.stockquote.png

Log Webservice Consumer's SOAP messages

In order to log the SOAP messages for request and response, we have to add a LogHandler to the webservice client. In Scout, there already exists a simple version of such a log handler, but the log is only written to the logging facade, not to the database. That is why we write our own DatabaseLogHandler that inherits from the Scout LogHandler.

Because handlers can be used in both, consumers and providers, they are located in 'Webservices (JAX-WS RI 2.1.6)' | 'Handlers'. Right-click on that node to create a new Handler [10]. In the dialog, enter the following values [11]:

Properties
Name: DatabaseLogHandler
Package: <do not change>
Super Type: LogHandler (click on 'Browse' to search for that type)
Run in Scout transaction: check because we are writing to database
Session factory: <do not change>

Double-click on the handler and implement it as following (source code):

After the handler is created, go back to the webservice consumer StockQuoteServiceSoapWebServiceClient. In Scout Property View, click on Exec Install Handlers to register the handler [12]. Simply add the DatabaseLogHandler to the list of handlers. Click here to get the source code.

Finally, if you launch the application and open a company, the SOAP messages are written into the database. In turn, if you open a log message, you should see something like this:

Org.eclipse.scout.jaxws.tutorial.ApplicationWsLog.png

Create Webservice Provider

On server node, go to the node 'Webservices (JAX-WS RI 2.1.6)' | 'Provider' | 'Services'. Right-click on that node to create a new webservice provider [13]. In the first wizard step, choose the 1st option to create a webservice provider from scratch, meaning not based on an existing WSDL file [14]. Click next (two times) to enter the WSDL name which is CompanyWebService.wsdl. Also, change the name for the service operation to getCompanies [15]. Click Finish to create the webservice provider. Click here to learn more about webservice provider creation. In case you encounter problems to build the webservice stub, refer to the Console Output for more information. Please find the created webservice provider CompanyWebService in Scout Explorer [16]. In the Scout Property View of this provider, you can access the various files such as the WSDL file, implementation class or the JAX-WS service type. Also, there you find links to rebuild the webservice stub, to change build properties for stub generation process, to edit binding customization files and more. Also, the authentication mechanism can be changed in the section Authentication and session context. For more information on that Property View, please click here.

So far, our webservice consists of a single operation to return companies. To open the WSDL file in the WSDL editor, click on the link 'CompanyWebService.wsdl' in the Scout Property View [17], To open the implementing port type, double click the webservice node or click on the 'CompanyWebService' link in the PropertyView [18]. As you can see, this webservice consists of a single operation getCompanies with a String as its return value and a String as its parameter. We will change that to return a list of company objects with no input parameter. Because this webservice is a Contract-First webservice, meaning that we are designing the WSDL file by ourself rather than generating it based on Java classes, open the WSDL editor [19] to change the service. Click here to follow detailed instructions. Alternatively, you can download the changed WSDL file from here.

As you changed the WSDL file, you have to regenerate the stub anew. Thereto, click on 'Rebuild webservice stub' in the Scout Property View of the provider [20]. If the WSDL file is valid, the stub generation will succeed. Otherwise, please refer to the Console Output to see what went wrong. Because we changed the method getCompanies, compilation errors are shown in the CompanyWebService Port Type [21]. Remove this wrong getCompanies method and add the unimplemented method instead [22]. As you can see, the method returns a list of companies. That is exactely what we wanted to have.

Finally, you have to implement the method getCompanies accordingly. Here, we simply return a list of all companies in database. Click here to get the source.

One last thing we still have to do. Because we configured the webservice to have authentication installed and to validate the request's credentials against config.ini [23], we have to specify the list of valid credentials in config.ini. Thereto, add the following line to the config.ini: That allows the user eclipse/scout to access our webservice.

org.eclipse.scout.jaxws.security.provider.ConfigIniCredentialValidationStrategy#credentials=eclipse\=scout;

Log Webservice Providers's SOAP messages

To log the SOAP requests and response, click on 'Webservices (JAX-WS RI 2.1.6)' | 'Provider' | 'Services' | 'CompanyWebService' | 'Handler Registration' [24]. Click on the link 'Add handler chain' to create a handler chain and 'Add handler' to add a handler to the chain [25]. By clicking on the 'Browse' button, choose 'DatabaseLogHandler' as the log handler.

Test the Webservice Provider

Launch the server and open your browser. Enter the URL http://localhost:8080/tutorial/jaxws/ and you get a list of all your installed webservice providers.
This looks as follows:

Org.eclipse.scout.jaxws.WebserviceOverview.png

To test your webservice implementation, download a webservice testing tool such as SoapUI.

In SoapUI, create a new 'SoapUI project' and enter http://localhost:8080/tutorial/jaxws/CompanyWebService?wsdl as your initial WSDL file. By double-clicking on the 'Request 1' node, the request dialog opens. On the property page, enter 'eclipse' as username and 'scout' as password. By clicking on the green 'play' button, the request is sent to your webservice and the SOAP response appears on the right side.

Org.eclipse.scout.jaxws.WebserviceTestWithSoapUI.png

See Also


Create webservice consumer
Create webservice consumer
Webservice Consumer
Set URL of webservice Endpoint
Application displaying stock quote consumed by webservice
Create new Handler
Create new DatabaseLogHandler
Register Handler on consumer
Webservice Log in application
Create webservice provider
Choose how to create the webservice provider
Specify webservice properties
Webservice provider
Open WSDL file of the CompanyWebService
Open webservice Port Type
Rebuild webservice stub
Compilation errors in Port Type due to change of WSDL file
Add unimplemented methods of port type interface
Authentication and credential validation settings
Authentication and credential validation settings
Test webservice with SoapUI
Test webservice with SoapUI
Add DatabaseLogHandler to CompanyWebService
Add DatabaseLogHandler to CompanyWebService