Catching multiple errors in Jenkins workflow

Question

My workflow sends mails when it fails using a try-catch. i have also enable concurrency and with this, when multiple jobs of the same workflow enters into a throttling stage, the new ones cancels the older ones. This throw an exception of "org.jenkinsci.plugins.workflow.steps.FlowInterruptedException" And canceled jobs also triggers the mail notification.

Now i have modified my workflow to catch the specific FlowInterruptedException exception and suppress the mail notice and let anything else to trigger the mail, like so.

node {
try {
// some stages for the workflow
}

catch (org.jenkinsci.plugins.workflow.steps.FlowInterruptedException e){

        echo "the job was cancelled or aborted"
         }

 catch (err){ 
         stage 'Send Notification' 
         mail (to: '[email protected]', 
         subject: "Job '${env.JOB_NAME}' (${env.BUILD_NUMBER}) has had an error.", 
              body: "Some text", 
            mimeType:'text/html'); 
         currentBuild.result = 'FAILURE' 
     } 

}

This is catching only the FlowInterruptedException and when the job really fails due to any other reason (command typo, etc), i was expecting it will be caught by the other catch and will trigger the code inside it to send the mail. But it isn't.

I think my code have some flaw in the try catch. Any idea?

UPDATE:

Just incase, if i use the below code it just send mail for just about any failures

node {
try {
// some stages for the workflow
}

catch (err){ 
         stage 'Send Notification' 
         mail (to: '[email protected]', 
         subject: "Job '${env.JOB_NAME}' (${env.BUILD_NUMBER}) has had an error.", 
              body: "Some text", 
            mimeType:'text/html'); 
         currentBuild.result = 'FAILURE' 
     } 

}

Solution

You can catch FlowInterruptedException - as you are doing now - and then check one of its causes (FlowInterruptedException#getCauses()) is org.jenkinsci.plugins.workflow.support.steps.StageStepExecution.CanceledCause, which means that the flow was interrupted while waiting to enter a stage step.

Any other combination is a legitimate error eligible to send the notification email.