First, we create another project in JDevelper. On the previously created BPEL sample project, we right-click, and select New…. From the Business Tier category, we select Web Services and then we select Web Service Proxy under Items as shown in the following screenshot:

Then, we click on OK, which shows the welcome screen, and then we click on Next. We have to enter the WSDL location of the BPEL process in the next window. We also have the ability to choose whether we want to copy the WSDL file into the project.

In the next window, we have to enter the name of the Java packages. We have to enter the package name of the proxy files (that is, Root Package for Generated Types) and Package Name, which is where the files for the XML serialization will be placed, as shown in the following screenshot:

We have inserted all the mandatory fields necessary to create the BPEL process proxy, so we conclude the wizard by clicking on Finish.

In JDeveloper, we see that a number of files were generated in a separate project. The package org.packt.bpel.sync.gen contains the files that are used for transformation between XML and Java.

Let us check the Process.java file. We see that the class contains only one member as follows:

    @XmlElement(required = true)
    protected String input;

The code is annotated with the @XmlElement annotation, which indicates the usage of JAXB (Java Architecture for XML Binding). The JAXB implementation enables conversion from Java to XML and vice-versa. We need this conversion because data in Java is stored in objects, while BPEL holds data in XML format.

The code starts with the reference to the BPEL process. Since the BPEL process is exposed as a web service, the code is as follows:

  @WebServiceRef
  private static Helloworldprocess_client_ep helloworldprocess_client_ep;

We can also note the @WebServiceRef annotation, which is used by JAX-WS (Java API for XML Web Services). The annotation indicates a reference to the web service port, or in our case, the BPEL process port.

We need to instantiate the proxy to the BPEL process and get the reference to the endpoint as follows:

  helloworldprocess_client_ep = new Helloworldprocess_client_ep();
  HelloWorldProcess helloWorldProcess = helloworldprocess_client_ep.getHelloWorldProcess_pt();

We define the input and output variables as the String type as follows:

  String input = "Jurij";
  String output;

Remember that the BPEL process is taking string as an input. As a result, the BPEL process returns a concatenated string starting with Hello, followed by the input string, and concluded with three exclamation marks. Finally, we call the BPEL process and write results to the output as follows:

  output = helloWorldProcess.process(input);
  System.out.println("Business process returned:" + output);

As a result of the BPEL process call, we receive the following output to JDeveloper:

We can see that the BPEL process was executed in the Oracle Enterprise Manager Console as shown in the following screenshot:

We can now see that the BPEL process completed successfully.