Understanding a JAX-WS client

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Java

SOAP

webservice

I recently received a JAX-WS client legacy code. I'm having a hard time debugging some of the issues such as thread safety in this code. The code has a stub class that was generated using JAX-WS RI,

@WebServiceClient(name = "Control", targetNamespace = "urn:Control", wsdlLocation = "file:/home/src/proj/Control.wsdl")
public class Control extends Service
{
private final static URL CONTROL_WSDL_LOCATION;

static {
    URL url = null;
    try {
      url = new URL("file:/home/src/proj/Control.wsdl");
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }
    CONTROL_WSDL_LOCATION = url;
}

public Control(URL wsdlLocation, QName serviceName) {
    super(wsdlLocation, serviceName);
}

public Control() {
    super(CONTROL_WSDL_LOCATION, new QName("urn:Control", "Control"));
}

@WebEndpoint(name = "Control")
public ControlPortType getControl() {
    return (ControlPortType)super.getPort(new QName("urn:Control", "Control"), ControlPortType.class);
}

@WebEndpoint(name = "Control")
public ControlPortType getControl(WebServiceFeature... features) {
    return (ControlPortType)super.getPort(new QName("urn:Control", "Control"), ControlPortType.class, features);
}
}

And there's another class that is building the webservice end point,

private final synchronized Control InitWSService() {
    if (service == null) {
        URL wsdl = Control.class.getResource("Control.wsdl");
        if (wsdl != null) {
            service = new Control(wsdl, new QName("urn:Control", "Control"));
        } else {
            service = new Control(); 
        }
        service.setExecutor(this);
    }
    return service;
}

This is used in building the Endpoint,

private void buildControlEndpoint() {
    InitWSService();
    ControlPortType control = service.getControl();
    Map<String, Object> ctext = ((BindingProvider)control).getRequestContext();
    URL address = getConnectionEndpoint();
    ctext.put(BindingProvider.ENDPOINT_ADDRESS_PROPERTY,address.toString()); 
}

Now I am having a hard time connecting the dots between the three. These are my doubts:

1. If the author who wrote this code generated the stub using wsimport, why is the url hard coded as a file path? Is this making a difference to how the code works? The wsdl is available locally in a resource folder.

2. In InitWsService, why are we fetching it as a class resource again? Is the WSDL location defined in the right way? How are proxies exactly used in JAX-WS?

3. Is this thread safe?