Thanks for your answer, I wanted to have only "one" queue were all flowfiles would be waiting.I know now that it was i bad idea => I reduced the size of the queue and now use backpresure. It corrected the priority problem. Thanks again ! ... View more

If anyone needs it (Matt answers helped me a lot but is not exactly correct) : for(var prop in context.properties) { if(prop.isDynamic()) { var name = prop.getName(); var value = context.getProperty(name).evaluateAttributeExpressions(flowFile).getValue(); //or var value = context.getProperty(name).getValue(); if AttributeExpression are not needed log.info('name : ' + name + " value : " + value); } } ... View more