HTTPClient "main" java.lang.NoSuchFieldError: org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit> 处的实例答案

【问题标题】：HTTPClient "main" java.lang.NoSuchFieldError: INSTANCE at org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit>HTTPClient "main" java.lang.NoSuchFieldError: org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit> 处的实例
【发布时间】：2016-03-08 13:06:58
【问题描述】：

我正在使用 Httpclient-4.5.2.jar 和 httpcore-4.4.4.jar HttpClient 组件，但出现以下错误。

Exception in thread "main" java.lang.NoSuchFieldError: INSTANCE
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit>(SSLConnectionSocketFactory.java:144)
at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:966)

我的源代码如下。

try {
        System.out.println("came to try catch");
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost request = new HttpPost("https://bizz.mobilezz.lk/apicall/loanprepaidapi/v1");
        StringEntity params =new StringEntity("{\"mobile\":\"776037285\",\"path\":\"IVV\",\"loanAmount\":\"200000\"}");
        request.addHeader("content-type", "application/json");
        request.addHeader("Authorization", "Bearer casmk34233mlacscmaacsac");

        request.addHeader("Accept", "application/json");        
        request.setEntity(params);
        HttpResponse response = httpClient.execute(request);
        System.out.println("response is :"+response.getStatusLine());

    } catch (Exception e) {
        e.printStackTrace();

请帮助我摆脱这个错误。我正在尝试以 post 方法发送请求并获取 json 响应。

【问题讨论】：

可能重复：stackoverflow.com/questions/32793830/…
我从您提供的链接中尝试过。它没有用。有没有办法检查jar文件的兼容性？许多帖子说检查 jar 文件的兼容性。我从 httpcomponents-client-4.5.2-bin 获得了这些 jar 文件。但它也没有用。
对不起，我不知道，但尝试找到一个工作教程。即 crunchify.com/… ，正如您在 pom.xml 中看到的那样 httpcore 和 httpclient 与以下版本兼容：4.4-beta1
当第 3 方依赖项引入旧版本的 apache 的 http 核心库时，我遇到了同样的错误。检查你的依赖树
如何检查依赖树？

标签： java json ssl post httpclient

【解决方案1】：

我找到了我的问题的答案并发布了供您参考。

HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(
                "https://bizz.mobilezz.lk/apicall/loanprepaidapi/v1");

        JSONObject json = new JSONObject();
        StringEntity params = new StringEntity("{\"msisdn\":\"" + mobile
                + "\",\"channel\":\"SDD\"}");

        new StringEntity(json.toString());
        post.addHeader("Host", "mife.dialog.lk");
        post.addHeader("content-type", "application/json");
        post.addHeader("Authorization", "Bearer " + access_token);
        post.addHeader("Accept", "application/json");

        // System.out.println("status code is:" + status);
        post.setEntity(params);
        HttpResponse response = client.execute(post);
        int status = response.getStatusLine().getStatusCode();
        System.out.println("status code is :" + status);
        resCode = Integer.toString(status);
        if (status != 401) {
            if (status != 409) {
                BufferedReader rd = new BufferedReader(
                        new InputStreamReader(response.getEntity()
                                .getContent()));
                String response1 = readAll(rd);
                System.out.println(response1);
                JSONObject obj = new JSONObject(response1);
                resCode = obj.getString("resCode");
                resDesc = obj.getString("resDesc");
                System.out.println(resCode);
                System.out.println(resDesc);
            }
        }
        System.out.println("reason code is :" + resCode);

【讨论】：

我遇到了同样的问题，这个解决方案对我有用。谢谢。