throws checked exception in RecordMapper:map method

[Denis Miorandi]

actually I use jooq mapper like this, but I don't know how to manage checked exception inside map method like throws.

I know this is not stricly a jooq stuff, but: any suggestions to do it in a smart way?

.fetchOne()

.map(new RecordMapper<Record, MyType>() {

@Override

        public MyType map(Record record) throws HERE??? {

                ....

                something that throw Exception 

                .....

        }

}

Actually I've seen something similar

• https://github.com/fge/throwing-lambdas
  
• https://github.com/JeffreyFalgout/ThrowingStream
  

[Lukas Eder]

Very interesting question!

Given that you don't know what to do with the checked exception means that the checked exception probably shouldn't be checked in the first place (e.g. SQLException, IOException, etc.). The common approach here is to wrap it in a runtime exception (for SQLException, I suggest jOOQ's DataAccessException).

A bit less common is to "sneaky throw" the checked exception again:

https://blog.jooq.org/2012/09/14/throw-checked-exceptions-like-runtime-exceptions-in-java/

You could also use jOOλ's Unchecked for this, possibly:

https://github.com/jOOQ/jOOL/blob/master/src/main/java/org/jooq/lambda/Unchecked.java

If you know you need to catch the specific checked exception somewhere outside of that mapper, then you'll have to be creative. But chances are high, you don't.

I hope this helps,

Lukas

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[Denis Miorandi]

tks Lukas,

      I'm going to just catch Exception and throw a RunTimeException. This is enough.

Just cause I'm curious

Can Unchecked.consumer be used on .fetch().map(new RecordMapper.......) ???

Due to RecordMapper is a @FunctionalInterface i suppose it's possible but looking at code I didn't find the way.

Tks

Denis

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Dott. Denis Miorandi
via dei Vignai 27
38060 - Nogaredo (TN)

[Lukas Eder]

Hi Denis,

Sorry, I thought that there was an Unchecked.sneakyThrow() public method, but there isn't. It's package-private in SeqUtils. Will add that immediately:

https://github.com/jOOQ/jOOL/issues/239

The other methods can't really be used with RecordMapper. Well, they can, but they won't add a lot of value...

Lukas

[Denis Miorandi]

cool. Tks Lukas.