you can at runtime get the System's properties and set all what you need to configurate the proxy...

Example:

System.getProperties().put("http.proxyHost", "myProxyURL");
System.getProperties().put("http.proxyPort", "myProxyPort");
System.getProperties().put("http.proxyUser", "myUserName");
System.getProperties().put("http.proxyPassword", "myPassword");

After some days I found the solution in my case and I try to explain it here.

• It is important to know which kind of SOAP Client service you have wrote. In my case I used CXF 3.1.7 to generate Java code. To be more explicit I had a WSDL file and Generated the code via wsdl2java plugin in maven with the mentioned version.

• In the level of the WebService the follwoing can be done in code to enter the proxy Setting

  private void setProxySetting(EventPortType port) {
      try{
      Client client = ClientProxy.getClient(port);
      HTTPConduit http = (HTTPConduit) client.getConduit();
      http.getClient().setProxyServer("***host***");
      http.getClient().setProxyServerPort(80);
      http.getProxyAuthorization().setUserName("***username***");
      http.getProxyAuthorization().setPassword("***password***");
   }catch (Exception e) {
    logger.error("Please Enter your proxy setting in MyClass class", e);
   }
  }
  

  The port is comming from the Service Level that I got like this

  EventService es = new EventService();
  EventPortType port = es.getEventPort();
  setProxySetting();