Hi,

I just run your test case using GeoTools master and got this output (by 
the way thanks for the test case):

Before adding:
fid--513c8211_1585fb4c467_-7fcf
fid--513c8211_1585fb4c467_-7fd0
fid--513c8211_1585fb4c467_-7fd1
fid--513c8211_1585fb4c467_-7fd2
fid--513c8211_1585fb4c467_-7fd3
fid--513c8211_1585fb4c467_-7fd4
fid--513c8211_1585fb4c467_-7fd5
fid--513c8211_1585fb4c467_-7fd6
fid--513c8211_1585fb4c467_-7fd7
fid--513c8211_1585fb4c467_-7fd8
fid--513c8211_1585fb4c467_-7fd9
fid--513c8211_1585fb4c467_-7fda
fid--513c8211_1585fb4c467_-7fdb
fid--513c8211_1585fb4c467_-7fdc
fid--513c8211_1585fb4c467_-7fdd
fid--513c8211_1585fb4c467_-7fde
fid--513c8211_1585fb4c467_-7fdf
fid--513c8211_1585fb4c467_-7fe0
fid--513c8211_1585fb4c467_-7fe1
fid--513c8211_1585fb4c467_-7fe2
fid--513c8211_1585fb4c467_-7fe3
fid--513c8211_1585fb4c467_-7fe4
fid--513c8211_1585fb4c467_-7fe5
fid--513c8211_1585fb4c467_-7fe6
fid--513c8211_1585fb4c467_-7fe7
fid--513c8211_1585fb4c467_-7fe8
fid--513c8211_1585fb4c467_-7fe9
fid--513c8211_1585fb4c467_-7fea
fid--513c8211_1585fb4c467_-7feb
fid--513c8211_1585fb4c467_-7fec
fid--513c8211_1585fb4c467_-7fed
fid--513c8211_1585fb4c467_-7fee
fid--513c8211_1585fb4c467_-7fef
fid--513c8211_1585fb4c467_-7ff0
fid--513c8211_1585fb4c467_-7ff1
fid--513c8211_1585fb4c467_-7ff2
fid--513c8211_1585fb4c467_-7ff3
fid--513c8211_1585fb4c467_-7ff4
fid--513c8211_1585fb4c467_-7ff5
fid--513c8211_1585fb4c467_-7ff6
fid--513c8211_1585fb4c467_-7ff7
fid--513c8211_1585fb4c467_-7ff8
fid--513c8211_1585fb4c467_-7ff9
fid--513c8211_1585fb4c467_-7ffa
fid--513c8211_1585fb4c467_-7ffb
fid--513c8211_1585fb4c467_-7ffc
fid--513c8211_1585fb4c467_-7ffd
fid--513c8211_1585fb4c467_-7ffe
fid--513c8211_1585fb4c467_-7fff
fid--513c8211_1585fb4c467_-8000

After adding:
feature1.1
feature1.2
feature1.3
feature1.4
feature1.5
feature1.6
feature1.7
feature1.8
feature1.9
feature1.10
feature1.11
feature1.12
feature1.13
feature1.14
feature1.15
feature1.16
feature1.17
feature1.18
feature1.19
feature1.20
feature1.21
feature1.22
feature1.23
feature1.24
feature1.25
feature1.26
feature1.27
feature1.28
feature1.29
feature1.30
feature1.31
feature1.32
feature1.33
feature1.34
feature1.35
feature1.36
feature1.37
feature1.38
feature1.39
feature1.40
feature1.41
feature1.42
feature1.43
feature1.44
feature1.45
feature1.46
feature1.47
feature1.48
feature1.49
feature1.50

Not sure why before adding we have a certain id and after we have 
another one, if I had to guess I would say the the first ones are just 
unique identifiers generated by the builder and the second ones are the 
unique ids generated by the store implementation, but as I say I'm just 
guessing here didn't check the code. Anyway in both cases the ids are 
unique which correspond to the expectations. Not sure why in your case 
you have the NULL ones after adding the features to the store, which 
version of GeoTools are you using ?

As a side note if needed you can provide your own id, please check this 
thread to see how:
http://osgeo-org.1560.x6.nabble.com/Fid-value-in-SimpleFeature-td5261651.html

Regards,

Nuno Oliveira

On 11/13/2016 10:51 AM, Rémi Pace wrote:
> Hi,
>
> I try to use GeoPackage to store SimpleFeatures but when I add them,
> their IDs become strange. Here there is a running example:
> https://github.com/remipassmoilesel/abc-map2/tree/master/src/test/java/org/abcmap/core/shapes
>
> Below a sample of output:
>
> // Before adding (with SimpleFeatureBuilder.buildFeature(null);
> fid-6c609a7e_1585d46582c_-7ff9
> fid-6c609a7e_1585d46582c_-7ffa
> fid-6c609a7e_1585d46582c_-7ffb
> fid-6c609a7e_1585d46582c_-7ffc
> fid-6c609a7e_1585d46582c_-7ffd
> fid-6c609a7e_1585d46582c_-7ffe
> fid-6c609a7e_1585d46582c_-7fff
> fid-6c609a7e_1585d46582c_-8000
>
> // After adding:
> feature1.null
> feature1.null
> feature1.null
> feature1.null
> feature1.null
> feature1.null
>
> I learned in Javadoc that feature ID format is dependent on storage,
> but is this a correct behavior ? Feature identifiers are not supposed
> to be unique ?
>
> I was about to use IDs to adapt style, so if IDs are not unique what
> is the best strategy ?
>
> Thanks for your help.
>

-- 
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