java - Camel exchange properties lost during split -

i have following setup of camel routes:

<route id="firstroute">     <from uri="..." />      <!-- processor puts list of items out body -->     <process ref="collectitemsprocessor" />      <!-- items should processed 1 one: -->     <split>         <simple>${body}</simple>         <to uri="direct:secondroute" />     </split> </route>  <route id="secondroute">     <from uri="direct:secondroute" />      <process ref="itemprocessor" /> </route> 

in itemprocessor want count number of items processed putting property exchange:

exchange.setproperty("processed_items", exchange.getproperty("processed_items", integer.class) + 1); 

for reason, on each call processor property null again. documentation says:

the exchange holds meta-data during entire lifetime stored properties accessible using various getproperty(string) methods.

https://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/exchange.html

when setting property in collectitemsprocessor, value kept. suspect exchange copied each call split route, how can keep "meta-data during entire lifetime"?

split creates new exchange each item. lifetime of exchange covers inside split element.

if want counter of elements processed use property "camelsplitindex". splitter automatically populates property.