JSON 和socket timeout 异常，请问是什么原因

HttpMessageNotReadableException: JSON parse error: java.net.SocketTimeoutException; nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.net.SocketTimeoutException) (through reference chain: com.app.entity.AppServiceEntity["installList"]->java.util.H

json序列化问题错误