Writing java code by using Proxy and TestRunner class

tree

Hello, i want to use the java code to run the sahi proxy server and run the TestRunner
these code:

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String sahiBasePath = "C:\\Users\\user\\sahi";
String userDataDirectory = "C:\\Users\\user\\sahi\\userdata";

net.sf.sahi.config.Configuration.initJava(sahiBasePath, userDataDirectory);

final Proxy proxy = new Proxy(Configuration.getPort());
currentInstance = proxy;
proxy.start(true);

String suiteName = "C:\\Users\\user\\sahi\\userdata\\scripts\\test.sah";
String browserType = "firefox";
String base_url = "http://demo.libreplan.org/libreplan/common/layout/login.zul";
String threads = "5";

TestRunner testRunner =
new TestRunner(suiteName, browserType, base_url, threads);

HashMap<String, Object> variableHashMap = new HashMap<String, Object>();
testRunner.setInitJS(variableHashMap);
String status = testRunner.execute();

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but these error :

Exception in thread "main" java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.URL.openStream(Unknown Source)
at net.sf.sahi.test.TestRunner.execute(TestRunner.java:328)
at net.sf.sahi.test.TestRunner.execute(TestRunner.java:310)
at test.testLauncher.main(testLauncher.java:41)

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could you help me? thank you!!

tree

i add the one line code : Thread.sleep(300);
like:
proxy.start(true);
Thread.sleep(300);
....

its works!!
but is the best solve?