使用java kubenetes client replaceClusterCustomObject报错Bad Request

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public RequestBody serialize(Object obj, String contentType) throws ApiException {
    if (obj instanceof byte[]) {
        return RequestBody.create(MediaType.parse(contentType), (byte[])((byte[])obj));
    } else if (obj instanceof File) {
        return RequestBody.create(MediaType.parse(contentType), (File)obj);
    } else if (this.isJsonMime(contentType)) {
        String content;
        if (obj != null) {
            content = this.json.serialize(obj);
        } else {
            content = null;
        }

        return RequestBody.create(MediaType.parse(contentType), content);
    } else {
        throw new ApiException("Content type \"" + contentType + "\" is not supported");
    }
}