Hi community.
I'm reproducing an exception using Complex Features and WFS GeoJSONBuilder
on Geoserver 2.16 (master) with this stack trace:
net.sf.json.JSONException: Nesting too deep.
at net.sf.json.util.JSONBuilder.push(JSONBuilder.java:270)
at net.sf.json.util.JSONBuilder.object(JSONBuilder.java:240)
at
org.geoserver.wfs.json.ComplexGeoJsonWriter.encodeFeature(ComplexGeoJsonWriter.java:105)
at
org.geoserver.wfs.json.ComplexGeoJsonWriter.encodeComplexAttribute(ComplexGeoJsonWriter.java:563)
at
org.geoserver.wfs.json.ComplexGeoJsonWriter.encodeProperty(ComplexGeoJsonWriter.java:409)
at
org.geoserver.wfs.json.ComplexGeoJsonWriter.encodeProperty(ComplexGeoJsonWriter.java:383)
at java.util.ArrayList.forEach(ArrayList.java:1257)
This exception is not present on previous versions (2.14 for example) and
looks like we are facing it since now some extra "properties" attributes were
added to GeoJSON encoding recently.
Checking for the root problem seems like json-lib JSONBuilder class has a
hard-coded limit of 20 nested levels as we can see on:
https://github.com/aalmiray/Json-lib/blob/master/src/main/java/net/sf/json/util/JSONBuilder.java#L61
Since we added new levels to GeoJSON encoding it is a good idea to relax a
bit this limit, but as you can see the problem is this limit is not
configurable since the static variable is final. So I see two solutions to
this:
* Fork json-lib and relax limit or make it configurable.
* Use reflection for modify the value at runtime.
Of course the first solution sounds better since reflection can be
problematic for some environments (for example blocked by a security manager).
I currently did a fork relaxing the limit to 5000 in:
https://github.com/fernandor777/Json-lib/tree/limit-fix-2.4
So it could be good to discuss the best approach to fix this and, of course,
to read better ideas from all you.
Thanks.
Regards,
Fernando Mino
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