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Creating a layer in Geoprocessing Service causes an error

NilsBabel

I have some logic in my Geoprocessing service that creates a layer in order to add it to a map.

1.        mxd = arcpy.mapping.MapDocument(map_document)
2.        df = arcpy.mapping.ListDataFrames(mxd)[0]
3.        arcpy.management.MakeFeatureLayer(out_zone, "layer") #out_zone is an in_memory fc
4.        buffer_layer = arcpy.mapping.Layer("layer") #this doesn't work in the gp service
5.        arcpy.mapping.AddLayer(df, buffer_layer, "TOP")

This works just fine in the script tool from ArcMap. It publishes successfully as well. But when I run the GP service I get an error on line 4 above. I have some traceback error reporting and it says the line that is failing is:

buffer_layer = arcpy.mapping.Layer(g_Esri_variable_3)

The error I get is Object: CreateObject layer invalid data source

So my question is what is g_Esri_variable_3? What is ArcGIS Server doing differently than the desktop script tool? Any suggestions on fixing this?

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Accepted answers

NilsBabel

I figured out a workaround. I saved the layer to a layer file. Then created the layer object from the layer file. Still don't know why the original script works in desktop but not server.

All comments

NilsBabel

I figured out a workaround. I saved the layer to a layer file. Then created the layer object from the layer file. Still don't know why the original script works in desktop but not server.

TerryGustafson

I'm having the same issue and I think its because the layer in in the "GPInMemoryWorkspace" and not on a disk.

JonMorris2

When publishing to server, certain variables are substituted for g_ESRI_variable_x and declared at the top of the script. Not sure why server needs to do this - some of the variables in my scripts are just field names, like g_ESRI_variable_4 = u'F_AREA'. You can see the amended script in the arcgissystem folder on the server, e.g. \arcgisserver\directories\arcgissystem\arcgisinput\LFP\lfp01Setup.GPServer\extracted\v101\_python\LFP_01_Setup.py

I think the problem in your script may be to do with the current path. The help doc says that the Layer constructor needs

A string that includes the full path and file name of an existing layer (.lyr) file.

Your script doesn't contain a path, so maybe the working folder is different when running on the server. Try specifying the full path for "layer" in lines 3 and 4.

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