SunCertPathBuilderException：无法在CN1应用中找到到请求目标的有效证书路径

请你帮忙。我有一个Codenameone应用程序，该应用程序向云Tomcat 8服务器发出GET请求，并期望返回一些响应JSON。重要的是，这是一个HTTPS调用。

当我在邮递员中运行请求时，它工作正常：

https://www.mydomain.co.uk:8443/MyProject/v1/generate_token

通过我的浏览器使用的URL相同，并显示为“安全”，我可以看到我的证书详细信息。我已经购买了用于SSL / TLS配置的证书，并且似乎在启动日志中可以正常运行。

在模拟器中，从URL调用读取响应时，我得到以下错误-我猜必须将其加密：

Exception: javax.net.ssl.SSLHandshakeException - sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
    at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1959)
    at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
    at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
    at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1514)
    at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
    at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1026)
    at sun.security.ssl.Handshaker.process_record(Handshaker.java:961)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1072)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
    at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:347)
    at com.codename1.impl.javase.JavaSEPort.getResponseCode(JavaSEPort.java:7591)
    at com.codename1.io.ConnectionRequest.performOperation(ConnectionRequest.java:702)
    at com.codename1.io.NetworkManager$NetworkThread.run(NetworkManager.java:282)
    at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)

为什么该应用程序与Postman进行呼叫有什么不同（“网络监视器”窗口确认相同的URL呼叫）？

我致电后没有更新任何日志，因此没有要检查的日志。从http更改为https之后，我尚未对应用程序进行任何更改（正在运行）。

这是进行呼叫的CN1代码：

public String fetchTokenIntoStorage(String userName, String password) {
        ConnectionRequest r = new ConnectionRequest();
        r.setUrl(Constants.URL_HOST_PORT + "/MyProject" + Constants.LIVE_OR_TEST
                + "/v1/generate_token");
        r.addRequestHeader("Content-Type", "application/json");
        r.addRequestHeader("userName", userName);
        r.addRequestHeader("password", password);
        r.setHttpMethod("GET");
        r.setFailSilently(false);
        r.setPost(false);
        // show spinning dialog while connecting
        InfiniteProgress prog = new InfiniteProgress();
        Dialog dlg = prog.showInifiniteBlocking();
        r.setDisposeOnCompletion(dlg);
        NetworkManager.getInstance().setTimeout(10000);
        // NetworkManager.getInstance().addErrorListener(new ActionListener() {
        //
        // @Override
        // public void actionPerformed(ActionEvent evt) {
        // MessageBox.showDialogMessage("Unable to connect to server. Please
        // retry later.");
        // }
        // });
        // NetworkManager.getInstance().updateThreadCount(2);
        NetworkManager.getInstance().addToQueueAndWait(r);

        if (r.getResponseData() != null) {
            JSONParser parser = new JSONParser();
            Map<String, Object> json = null;
            try {
                json = parser.parseJSON(new InputStreamReader(new ByteArrayInputStream(r.getResponseData())));
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            if (json.get("error") != null) {
                return String.valueOf(json.get("error"));
            }
            JwtRecord record = new JwtRecord();
            record.userId = Integer.parseInt(String.valueOf(json.get("userId")));
            record.jsonWebToken = (String) json.get("jwt");
            record.theme = "LIGHT";
            Storage.getInstance().writeObject("MyToken", record);
            return "";
        }
        if (!r.getResponseErrorMessage().equalsIgnoreCase("")) {
            return r.getResponseErrorMessage();
        } else {
            return "Unable to connect to server. Please check connection.";
        }
    }

单步执行代码之后似乎出错

NetworkManager.getInstance().addToQueueAndWait(r);

r.getResponseData（）和r.getResponseErrorMessage（）为空。

非常感谢