Global exception handler for all workflows (or activities) exceptions

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1

Hi. I need to catch all workflow exceptions and convert them to real exception based by ‘type’ field, but I don’t want to write try-catch blocks ewerywhere. Is there a way to create a global exception handler in temporal? Some sort of cross-cutting logic to catch WorkflowFailedException and throw original exception (or handle).

2

Catch WorkflowFailedException and throw the original exception to which caller?

3

Yes, but i want to do it in one place for every workflows (or activities) calls. Something like aspect programming.
Can i inject my custom exception handler?

4

You can write an interceptor that does this. I’m not sure if such a feature wouldn’t create more problems than solve them. For example, many exceptions are not serializable at all.

5

I’ve already tried this (throw original exception in interceptor), but each thrown exceptions were wrapped in WorkflowFailedException. I think it happpens in WorkflowExecutionHandler.runWorkflowMethod() method, because in code iseen some lines like:
try {
… - here execution call
} catch(Exception e) {
applyWorkflowPolicyAndRethorow(e); - here throw wrapped exception
}

6

I think you’ll have to unwrap in the client side interceptor.

7

Unfortunally, it doesn’t work.

@Override
    public <R> GetResultOutput<R> getResult(GetResultInput<R> input) {
        try {
            return super.getResult(input);
        } catch (Exception e) {
            System.out.println("ExceptionWorkflowClientsCallInterceptor");
            throw new CustomRuntimeException("client"); - "original" exception here
       }
    }

Exception will wrap (by WorkflowExecutionHandler or WorkflowStubImpl i think)
In sout i see, that my WorkflowClientsCallInterceptor calling, but thrown exception is wrapped.

8

Then, I recommend stopping fighting the Temporal error handling and keeping the exceptions as they are. There is a reason for the wrapping as it keeps all the necessary information about the failure. For example, the wrapper exception contains information about the workflow/activity that failed.