About the cache level:
see:
http://camel.apache.org/jms.html

Transactions and Cache Levels

If you are consuming messages and using transactions (transacted=true) then
the default settings for cache level can impact performance. 
If you are using XA transactions then you cannot cache as it can cause the
XA transaction not to work properly.
If you are not using XA, then you should consider caching as it speedup
performance, such as setting cacheLevelName=CACHE_CONSUMER.
Through Camel 2.7.x, the default setting for cacheLevelName is
CACHE_CONSUMER. You will need to explicitly set cacheLevelName=CACHE_NONE.
In Camel 2.8 onwards, the default setting for cacheLevelName is CACHE_AUTO.
This default auto detects the mode and sets the cache level accordingly to:
CACHE_CONSUMER = if transacted=false
CACHE_NONE = if transacted=true
So you can say the default setting is conservative. Consider using
cacheLevelName=CACHE_CONSUMER if you are using non-XA transactions.


This explains why 2.7.x is different from 2.8 onwards.

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