enhancement: allow Java8 lambda steps to throw checked Exceptions

[RichardBradley]

Any steps declared with the Java8 lambda syntax may not throw checked Exceptions:

    // Compile error: Unhandled exception: IOException
    Given("^I have a file with some text$", () -> {
        Files.write("my setup", new File("example.txt"), Charsets.UTF_8);
    });

It would be more convenient for developers if they were declared as "throws Exception"; the runtime machinery all copes with it fine, and it avoids lots of "catch(e) { throw new RuntimeException(e) }" noise.

This should be a simple change to the interface declarations in StepdefBody

[leodutra]

Any temporary replacement for this? Any special RuntimeException to be thrown?

[RichardBradley]

There is an easy workaround for now: catch all your checked exceptions and rethrow as RuntimeException:

Given("^I have a file with some text$", () -> {
    try {
        Files.write("my setup", new File("example.txt"), Charsets.UTF_8);
    } catch(e) { 
        throw new RuntimeException(e) 
    }
});

[christianhujer]

I guess the solution is to add throws Exception to all accept() methods of the A* interfaces in src/main/java/cucumber/api/java8/StepdefBody.java. And I agree it would remove a hell lot of noise.

[renannprado]

any news on this?
I'm having exact same problem.

[RichardBradley]

No-one has stepped up to implement it yet. I would hope that a well written PR fix would be accepted, but I can't speak for the project maintainers. I don't plan to implement it myself in the short / medium term.

[RichardBradley]

Thanks!

[lock]

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