1、getForObject的定义如下：
public <T> T getForObject(URI url, Class<T> responseType) throws RestClientException { RequestCallback requestCallback = this.acceptHeaderRequestCallback(responseType); HttpMessageConverterExtractor<T> responseExtractor = new HttpMessageConverterExtractor(responseType, this.getMessageConverters(), this.logger); return this.execute(url, HttpMethod.GET, requestCallback, responseExtractor); }
当responseType的泛型T中包含 List 的时候，结果无法转换成 List，这时候便会包ClassCastException 错误
2、解决方案
使用 exchange() 方法代替 getForObject
示例：RegulateCommand 为带有 List 的类
RegulateCommand regulateCommandResult = restTemplate.exchange(customConfig.getBaseUrl() + "/sws/regulate_pressure/executing", HttpMethod.GET, null, new ParameterizedTypeReference<RegulateCommand>() {}).getBody();
springboot中RestTemplate 的getForObject 报错ClassCastException错误
原文：https://www.cnblogs.com/lkc9/p/11834803.html