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JsonPath transformation service comply with the contract #4379

merged 1 commit into from Oct 10, 2017


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@sjsf sjsf commented Oct 5, 2017 it was returning null in case the path pointed to an element which did not exist.
Now it throws a TransformationException.

I'm not 100% sure though if this really is always the right way of fixing it. A missing element in JSON is somewhat similar to "intentionally null", i.e. UndefType.UNDEF might also be a consideration. Any deeper insights anybody?

fixes #4376
Signed-off-by: Simon Kaufmann it was returning null in case the path pointed to an element which did not exist.

fixes eclipse-archived#4376
Signed-off-by: Simon Kaufmann <>
@sjsf sjsf force-pushed the fixJsonTransformation branch from 5cd0969 to f90852c Oct 6, 2017
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@kaikreuzer kaikreuzer commented Oct 6, 2017

Any deeper insights anybody?

Not from my end.
Shall we wait for insights from others or "just merge"...?

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@sjsf sjsf commented Oct 6, 2017

Then suggest using merging it because it now fits to the javadoc contract. If it turns out this is not appropriate, then we still can adapt it afterwards.

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@martinvw martinvw commented Oct 6, 2017

Hmm, reading your suggestion UndefType.UNDEF or UndefType.NULL might make more sense, it is after all an element which may be only missing this time. And it's not uncommon in JSON the leave out any null values, see for example some NPE's I got in the Nest binding because I do not posses all Nest devices.

htreu approved these changes Oct 9, 2017
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@htreu htreu left a comment

lgtm, should be merged.

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@htreu htreu commented Oct 9, 2017

@martinvw imho the transformation service is right about throwing a TransformationException. Its in the responsibility of the caller to act appropriate. And from the code I saw the exception is handled well by all callers.

@kaikreuzer kaikreuzer merged commit f1c63ba into eclipse-archived:master Oct 10, 2017
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@sjsf sjsf deleted the fixJsonTransformation branch Nov 14, 2017
@kaikreuzer kaikreuzer added this to the 0.9.0 milestone Nov 30, 2017
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4 participants