我需要一个快速的帮助。我正在尝试编写一个测试类，并得到下面的错误“cannotresolve the method.thenreturn（org.apache.kafka.clients.producer）

@Test
public void testPublishData_Success() throws java.lang.Exception {
    when(GetPropValues.getPropValue(PublisherConstants.ATMID)).thenReturn("ATM");
    when(GetPropValues.getPropValue(PublisherConstants.DATA_SOURCE)).thenReturn("PCE");

    ReadAndWriteFiles mockFiles = Mockito.mock(ReadAndWriteFiles.class);
    PowerMockito.whenNew(ReadAndWriteFiles.class).withNoArguments().thenReturn(mockFiles);
    Mockito.when(mockFiles.getAllFiles()).thenReturn("someValue");

    KafkaProducer mockProducer = Mockito.mock(KafkaProducer.class);
    PowerMockito.whenNew(KafkaProducer.class).withAnyArguments().thenReturn(mockProducer);

    producer.publishData(null, "Test", "Data1");
}

powermockito返回readandwritefiles.class对象很好，但是它为kafkaproducer.class抛出了一个错误。在线

PowerMockito.whenNew(KafkaProducer.class).withAnyArguments().thenReturn(mockProducer);

这项工作还有别的解决办法吗？任何建议都将不胜感激。
注意：kafkaproducer.class不是自定义类，而是ApacheSparkKafka库中的类
主要代码如下

KafkaProducer<String, String> producer = new KafkaProducer<String, String>(props);
            InputData inputMessage;
            try {
                inputMessage = populateData(timeStamp, dataCategory, data, atmId, topic);
                ReadAndWriteFiles readerWriter = new ReadAndWriteFiles();
                File[] directory = readerWriter.getAllFiles();
                if (directory != null && directory.length > 0) {
                    if (connectionSet && !publishingData) {
                        sendDataFromFiles(producer, directory);
                        publishingData = false;
                    }
                } else {
                    producer.send(keyedMsg, new KafkaResponseHandler(inputMessage));
                }

            } catch (IOException e) {

            }