I've tried to use the geoserver API to create a LayerGroup using the example in
the documentation [1], but I'm getting an error 500.
On older versions of geoserver (e.g. 2.8) I get a
'java.lang.NullPointerException'.
On newer versions (e.g. 2.16) I get next message:
java.lang.IllegalArgumentException: Invalid style group: No layer or layer
group named 'default_polygon' found in the catalog
>From the API documentation [2], it seems that the API has evolved, despite the
swagger API version number seems not to be managed (1.0.0).
The example above looks like:
<layerGroup>
<name>nyc</name>
<layers>
<layer>roads</layer>
<layer>parks</layer>
<layer>buildings</layer>
</layers>
<styles>
<style>roads_style</style>
<style>polygon</style>
<style>polygon</style>
</styles>
</layerGroup>
However, with the new API it would looked like:
<layerGroup>
<name>nyc</name>
<publishables>
<published type="layer">
<name>roads</name>
</published>
<published type="layer">
<name>parks</name>
</published>
<published type="layer">
<name>buildings</name>
</published>
</layers>
<styles>
<style><name>roads_style</name></style>
<style><name>polygon</name></style>
<style><name>polygon</name></style>
</styles>
</layerGroup>
The attribute 'type="layer"' seems not to be documented, but I copied from a
working example I found.
I wonder whether this is a bug or it is normal behaviour. Afaik, when the
corresponding layer and style exist both in the catalog, the style is taken as
a Symbology Encoding [3], so it must not be interpreted as a Style Group, and
it shouldn't look for the named layers.
>From the API [2]:
layer > name : Name of the comprising layer, or empty to indicate a style group
defined by the corresponding style
style > name : Name of the style for the corresponding layer in the list, or
empty to use the default style of the corresponding layer.
I wonder:
1. whether I'm doing anything wrong,
2. whether this is a bug, and
3. whether there is more detailed documentation about API usage.
Thanks in advance,
-Eduardo
[1] https://docs.geoserver.org/stable/en/user/rest/layergroups.html
[2] https://docs.geoserver.org/latest/en/api/#1.0.0/layergroups.yaml
[3] https://docs.geoserver.org/stable/en/user/styling/sld/working.html
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