apache-camel错误处理程序范围说明

Question

Below is an example route take from Camel In Action book. There is one error handler at context scope and two route definitions. My questions

1. Is it correct to say that the context level error handler is applicable only for Route 1?
2. Does the dead letter error handler kick in for any exceptions thrown from any of the steps in route 2. ie from orderService.validate() and orderService.enrich() .

3. What if I want different error handler for exceptions that arise from validate() and enrich() methods?

   //context scope error handler

    errorHandler(defaultErrorHandler() .maximumRedeliveries(2) .redeliveryDelay(1000) .retryAttemptedLogLevel(LoggingLevel.WARN)); //Route 1 from("file://target/orders?delay=10000") .beanRef("orderService", "toCsv") .to("mock:file") .to("seda:queue.inbox"); //Route 2 with route scope error handler from("seda:queue.inbox") .errorHandler(deadLetterChannel("log:DLC") .maximumRedeliveries(5).retryAttemptedLogLevel(LoggingLevel.INFO) .redeliveryDelay(250).backOffMultiplier(2)) .beanRef("orderService", "validate") .beanRef("orderService", "enrich") .to("mock:queue.order"); 

Answer 1

your assumptions on #1 & #2 are correct...

for #3, either define Exception Clauses to catch explicit exceptions thrown by your bean methods (OrderValidateException, EnrichException, etc.) or use inline try-catch blocks around each step in your route (I prefer the first approach myself)