Unirest JSONElement NoSuchMethodError

Question

我正在使用Unirest库调用公共可用的REST端点，代码如下：

public void callRest() {
    String url = "https://upstream.com/token"
    HttpResponse<JsonNode> response = (HttpResponse<JsonNode>) Unirest.post(url).
            field("username", "###").
            field("password", "###").
            field("grant_type", "password").
            field("client_id", "####").
            field("client_secret", "####").asJson().getBody();
}

我收到以下错误：

Exception in thread "main" java.lang.NoSuchMethodError: com.google.gson.Gson.newBuilder()Lcom/google/gson/GsonBuilder;
    at kong.unirest.json.JSONElement.<clinit>(JSONElement.java:39)
    at kong.unirest.JsonNode.<init>(JsonNode.java:44)
    at kong.unirest.JsonResponse.toJsonNode(JsonResponse.java:49)
    at kong.unirest.JsonResponse.getNode(JsonResponse.java:43)
    at kong.unirest.JsonResponse.<init>(JsonResponse.java:35)
    at kong.unirest.apache.BaseApacheClient.transformBody(BaseApacheClient.java:53)
    at kong.unirest.apache.ApacheClient.request(ApacheClient.java:127)
    at kong.unirest.BaseRequest.asJson(BaseRequest.java:213)

最突出的一行是

at kong.unirest.json.JSONElement.<clinit>(JSONElement.java:39)

其中最统一的库只是声明

private static transient final Gson PRETTY_GSON = new Gson().newBuilder().setPrettyPrinting().create();

在JSONElement类中。我遵循了Unirest文档中给出的指导原则，你可以找到here。

我添加的POM依赖项如下：

        <dependency>
            <groupId>com.konghq</groupId>
            <artifactId>unirest-java</artifactId>
            <version>3.3.00</version>
        </dependency>
        <dependency>
            <groupId>com.konghq</groupId>
            <artifactId>unirest-java</artifactId>
            <version>3.3.00</version>
            <classifier>standalone</classifier>
        </dependency>

Answer 1

实际上，这是与Unirest的版本冲突。当我删除

        <dependency>
            <groupId>com.konghq</groupId>
            <artifactId>unirest-java</artifactId>
            <version>3.3.00</version>
            <classifier>standalone</classifier>
        </dependency> 

并通过.asJson()获取结果，然后一切都为我工作。