RestClient readWithMessageConverters method hiding I/O Exceptions with incorrect error message.

The org.springframework.web.client.DefaultRestClient#readWithMessageConverters method from spring-web:7.0.8 is hiding I/O Exceptions (SocketTimeouts from connectTimeout/readTimeout) as a RestClientException with an unrelated content-type incompatibility message:

throw new RestClientException("Error while extracting response for type [" + ResolvableType.forType(bodyType) + "] and content type [" + contentType + "]", cause);

For example a SocketTimeout exception triggered by a readTimeout set in a client configured with Accept/Content-Type headers for "application/json", throws a RestClientException with the message:

"Error while extracting response for type [MyServiceResponse] and content type [application/octet-stream]"

This message is misleading, causing confusion in the actual underlying issue. Ideally if the issue is I/O related, the readWithMessageConverters method should throw a ResourceAccessException with the proper message.

Start at org.springframework.web.client.DefaultRestClient#readWithMessageConverters and trace how I/O failures such as connectTimeout and readTimeout are caught and wrapped. Reproduce a timeout with JSON Accept/Content-Type headers, then verify that the resulting exception identifies the I/O failure rather than reporting content-type incompatibility.