Whole bunch of web service calls give a port already in use error!

Question

So I have a java app that happily talks to a web service and asks it for stuff several hundred times in a span of 20 mintues.

Everything was working fine using the test web service (but slow).. when I connected my app the the real web service, I noticed it was much much faster but but I get an exception:

I/O exception (java.net.BindException) caught when processing request: Address already in use: connec

I put a Thread.sleep(1000) between the consecutive web service calls and it seems to work but is there a better way to fix this rather than slowing down execution? Maybe an option I can set while initializing the webservice?

I am using axis 2, and java.

Code sample:

private String getPath(long id, String name) {


    try {
        Thread.sleep(500); 
    } catch (InterruptedException e1) {
        e1.printStackTrace();
    }
    String path = name;
    rDto[] roles = null; 

    FindParent currentEntity = new Stub.FindParent();
    currentEntity.setEntityId(id);

        //Send Request 
          Stub.FindParentE req = new Stub.FindParentE();
        req.setFindParent(currentEntity);
        //Get Response 
        FindParentResponseE response = null;
    try {
        response = stub.FindParent(req);
    } catch (RemoteException e) {
        logger.fatal("Error receiving parent" + e);
        System.exit(0);
    } catch (ServiceExceptionException0 e) {
        logger.fatal("Error receiving parent" + e);
        System.exit(0);
    }
        if ( ! (null == response.getFindParentResponse().get_return() )) { 

            oeDto[] ids = response.getFindParentResponse().get_return();
            paths = new ArrayList();
                for (int i = 0; i < ids.length; i++) {
                        //getPossibleHiearchy
                        String name = ids[i].getName();
                        long id = ids[i].getId();
                        paths.add( getBranch(id, name) + "/" + name);
                  }

                ...
        }

        return path;

    }