JBoss Fuse - Fuse workshop Error Handling
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This small independent workshop talks about error handling in Camel. It covers the basic error handler, catches exceptions and also using try and catch in Camel route.
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JBoss Fuse - Fuse workshop Error Handling
- 1. JBoss Fuse Error handling Christina Lin JBoss Technology Evangelist clin@redhat.com
- 2. RED HAT CONFIDENTIAL | ADD NAME2 Irrecoverable Recoverable Error Handling PROBLEM!!! Unstable network? Messaging queue full Incorrect ID data format Name not found
- 3. RED HAT CONFIDENTIAL | ADD NAME3 Error Handling Recoverable • Errors can be reprocessed • Problem will go away in time • Exception • Stores in Exchange Irrecoverable • Errors cannot be reprocessed • Problem stays the same • Fault Flag • Stores in Out Message in Exchange exchange.getOut().setFault(true); exchange.getOut().setBody(”err");
- 4. RED HAT CONFIDENTIAL | ADD NAME4 Error Handling Error Handler On Exception Try Catch Finally <errorHandler id=”errHandler” type="DefaultErrorHandler”> </errorHandler> <onException> <exception> java.io.IOException</exception> <exception> java.io.SQLException</exception> <onException> <doTry> <process ref="processorFail"/> <to uri="mock:result"/> <doCatch> <exception>java.io.IOException</exception> <to uri="mock:catch"/> </doCatch> <doFinally> <to uri="mock:finally"/> </doFinally> </doTry>
- 5. RED HAT CONFIDENTIAL | ADD NAME5 Redelivery Settings MaximumRedeliveries RedeliveryDelay BackOffMultiplier CollisionAvoidanceFactor MaximumRedeliveryDelay DelayPattern AsyncDelayedRedelivery Maximum number of redelivery attempts allowed. Delay between each redelivery (ms) Asynchronous delayed redelivery or not? Exponential backoff multiplier used in each delay Eg. 1000, 1000x2, 10000x2x2 percentage to use when calculating a random delay offset An upper bound for redelivery delay Pattern for calculating delay 0:1000;3:500;10;100
- 6. RED HAT CONFIDENTIAL | ADD NAME6 Exception Policy <redeliveryPolicy maximumRedeliveries="5" retryAttemptedLogLevel="WARN" backOffMultiplier="2" useExponentialBackOff="true"/> Recoverable Errors <errorHandler id=”errHandler” type="DefaultErrorHandler”> <onException> <exception> java.io.IOException</exception> <exception> java.io.SQLException</exception>
- 7. RED HAT CONFIDENTIAL | ADD NAME7 Error Handlers and Scope Camel Context Route Route Route Error Handler On Exception Error Handler On Exception Try n Catch DefaultError Handler LoggingErro rHandler NoErrorHan dler DeadLetter Channel Error Handler Camel Context Scope Camel Route Scope
- 8. RED HAT CONFIDENTIAL | ADD NAME8 Error Handler DefaultErrorHandler Default one Log <errorHandler id=”errHandler” type="DefaultErrorHandler”/>
- 9. RED HAT CONFIDENTIAL | ADD NAME9 Error Handler DeadLetterChannel Log Dead Letter Channel Queue Database Log File Option to put Original Message <errorHandler id=”errHandler” type="DeadLetterChannel” deadLetterUri=“amq:queue:DLQ"/>
- 10. RED HAT CONFIDENTIAL | ADD NAME10 On Exception Default Error Handler java.lang.Exception java.lang.IOException java.lang.FileNotFoundException FileNotFoundException redeliveryDelay = 3000 redeliveryDelay = 5000 Delay = 5000 Retry = 3 MyException redeliveryDelay = 2000 Delay = 2000 Retry = 3 maximumRedeliveries= 3 Not Handled
- 11. RED HAT CONFIDENTIAL | ADD NAME11 Try.. Catch.. Finally doTry doCatch doCatch doCatch Process Process Exception Exception Exception Handled = falseException onWhen Return exception to beginning (Caller) Add more condition to the exception condition onRedeliver retryWhile Catch multiple Exceotion
- 12. RED HAT CONFIDENTIAL | ADD NAME12 Try.. Catch.. Finally <route> <from uri="direct:start"/> <doTry> <process ref="processorFail"/> <to uri="mock:result"/> <doCatch> <exception>java.io.IOException</exception> <handled><constant>false</constant></handled> <to uri="mock:io"/> </doCatch> <doCatch> <exception>java.io.IOException</exception> <onWhen><simple>${exception.message} contains 'Damn'</simple></onWhen> <to uri="mock:catch"/> </doCatch> <doCatch> <exception>java.lang.Exception</exception> <to uri="mock:error"/> </doCatch> </doTry> </route> Just like Java
- 13. RED HAT CONFIDENTIAL | ADD NAME13 Error Handler Exercise Stock purchase XML XML XSD Schema orderdata Catch the validate exception garbage Next step
- 14. RED HAT CONFIDENTIAL | ADD NAME14 Error Handler Exercise XML Random Exceptions Retry if failed DLQ Data