deepseek java demo运行发生异常，请问该如何解决

代码用的demo完成一样的代码，只是把DASHSCOPE_API_KEY替换成了申请的key。
多轮对话
An error occurred while calling the generation service: {"statusCode":-1,"message":"SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target","code":"network error","isJson":false}

流式输出
An exception occurred: {"statusCode":-1,"message":"Get response failed!","code":"network error","isJson":false}