Feature: add the ability to recover messages when using batching using Retry Interceptors

[andrebrait]

Affects Version(s): 2.2.1.RELEASE

Enhancement

When using batching in listeners with a List parameter, if an exception is thrown, there's no way to recover from it using a retry interceptor since

spring-amqp/spring-rabbit/src/main/java/org/springframework/amqp/rabbit/config/StatelessRetryOperationsInterceptorFactoryBean.java

Line 59 in e6e659a

Message message = (Message) args[1];

throws a ClassCastException.

What I think could be done is to have either some other way to use a retry recoverer or detect the proper argument type (i.e. List of messages instead of a single message) and loop over them, although I'm not sure what would be the best approach

[garyrussell]

Yes, we should fix this, but bear in mind that "recovering" from a failed delivery of a batch is difficult because the framework (and hence the recoverer) has no inherent knowledge which message in the batch failed (when it's a consumer-created batch that is; for a producer-created batch, there is only one message).

[andrebrait]

Thanks for this, guys!