# Creating a Bottom-Up Web Service

This tutorial shows how to create a simple Web service and Web service client from a Java class. The Java class in this scenario converts between the Celsius and Farenheit temperature scales.

## Prerequisites

Before creating the Web service, there are two prerequisites:

1. Install Apache Tomcat
2. Create a Web project
   1. Open File -> New -> Other... -> Web -> J2EE Web Module to create a new flexible project and Web module .
   2. Click New...
   3. Enter `ConverterProject` into the Name field.
   4. Ensure that the Target server is set to Apache Tomcat v5.0 .
   5. Click Finish. Result:
   6. Enter `converter` into the Module Name field. . Result:
   7. Click Finish .

## Creating a bottom up Java bean Web service and Web service client

1. Import the wtp/Converter.java class into Converter/JavaSource (be sure to preserve the package).
2. Select the Converter.java file.
3. Open File -> New -> Other... -> Web Services -> Web Service.
4. Select Generate a proxy .
5. Select Test the Web service .
6. Select Monitor the Web service .
7. Select Overwrite files without warning .
8. Result:
9. Click Next . Result:
10. Click Next to get to the Service Deployment Configuration Page . Result:
11. If you want to choose a server different from the one defaulted by the wizard, click the Edit button to: select a server .
12. Click Finish .
13. It will take about one minute for the wizard to assemble the Web service and Web service client Web projects, start Apache Tomcat, and deploy the projects to Tomcat. Once finished, the generated Sample JSP Web application will appear in the browser view, maximized here for clarity:
14. Under Methods , click on celsiusToFarenheit(float) .
15. Under Inputs , enter `37` into the celsius entry field.
16. Click on Invoke . In the Result view, you should get a response of 98.6 .

17. Since you selected the "Monitor Web service" check box, a TCP/IP port is automatically created on the Tomcat server. When you in invoked the Web service, the TCP/IP view would come up automatically showing the SOAP message request and response. Double-click on the TCP/IP view, select XML view in the drop-down combo for both request and response. Result:

The Web Service wizard is orchestrating the end-to-end generation, assembly, deployment, installation and execution of the Web service, Web service client, and sample JSPs. In this scenario we clicked Finish on page one. In effect, this is allowing the wizard to pick reasonable defaults according to the basic high-level choices made on the first page. If you repeat this scenario, but use the Next button to work thru the wizard, you will learn more about the kinds of choices that are available and the kinds of defaults being assumed.

After completing this scenario, the WSDL for the Converter Web service can be found in Converter/WebContent/wsdl/Converter.wsdl.

Now that your Web service is running, there are a few interesting things you can do with this WSDL file. Examples:

1. You can double-click on the WSDL to open the WSDL graphical editor.
2. You can right-click on the WSDL and choose Web Services -> Test with Web Services Explorer to test the service.
3. You can right-click on the WSDL and choose Web Services -> Publish WSDL file to publish the service to a public UDDI registry.
4. You can click on the WSDL and choose -> New -> Other... -> Web Services -> Web Service Client to generate a Web service client. Note, however, that we have already witnessed the internal and visual features of the Web Service Client wizard since, in addition to being its own wizard, it is quite literally embedded within the larger Web Service wizard.

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