We have a feature called Unit in the 'feat' workspace, data for which is in an
Oracle database. Columns of UNIT are REC_ID, RAW_UUID, UUID, and CODESPACE.
REC_ID is the primary key; the combination of the last two is a unique key.
Unit has one or more child elements representing the state of the UNIT feature
during various time slices. The child table columns of interest for my issue
are REC_ID (primary key of table UNIT_TS) and UNIT_REC_ID (foreign key to
UNIT). The source for the time slice feature is a database view UNIT_TS_VIEW
which is a join of UNIT_TS and a few other tables. There is no linkage to any
other feature.
The schema for a Unit feature with REC_ID=12345 and UNIT_TS.REC_ID=67890 is
like this:
<feat:Unit gml:id="Unit.Rec.Id.12345">
<gml:identifier codeSpace="[CODESPACE value]">[UUID
value]</gml:identifier>
<feat:timeSlice>
<feat:UnitTimeSlice gml:id="TimeSlice.67890">
<!-the various elements belonging to this time slice -->
</feat:UnitTimeSlice>
<feat:timeSlice>
<!-Additional time slices if they exist -->
</feat:Unit>
When I do a WFS query filtering on the value of gml:identifier, I get the
expected results, and there are no errors in the log. I can also filter on
elements that are part of UnitTimeSlice. But while the results are still as
expected, I get errors in the log that look like this:
21:14:29,098 WARN [org.geotools.filter] (http-gis.dev/10.160.72.33:9443-3)
Error occured mapping UNIT_REC_ID to feature type:
java.lang.IllegalArgumentException: Could not find working property accessor
for attribute (UNIT_REC_ID) in object (SimpleFeatureTypeImpl UNIT identified
extends Feature(REC_ID:REC_ID,RAW_UUID:RAW_UUID,UUID:UUID,CODESPACE:CODESPACE))
at
org.geotools.filter.AttributeExpressionImpl.evaluate(AttributeExpressionImpl.java:229)
[gt-main-16.2.jar:]
[remainder of stack trace omitted]
Caused by: java.lang.IllegalArgumentException: x-path gives no results.
at
org.geotools.filter.expression.FeaturePropertyAccessorFactory$FeaturePropertyAccessor.get(FeaturePropertyAccessorFactory.java:279)
[gt-complex-16.2.jar:]
Any idea what I need to do to get rid of these errors when filtering on an
element in the time slice? The mapping file feat_Unit.xml has the following
relevant excerpts:
<typeMappings>
<FeatureTypeMapping>
<sourceDataStore>datastore</sourceDataStore>
<sourceType>UNIT</sourceType>
<targetElement>feat:Unit</targetElement>
<attributeMappings>
<AttributeMapping>
<targetAttribute>feat:Unit</targetAttribute>
<idExpression>
<OCQL>strConcat('Unit.Rec.Id.',REC_ID)</OCQL>
</idExpression>
</AttributeMapping>
<AttributeMapping>
<targetAttribute>gml:identifier</targetAttribute>
<sourceExpression>
<OCQL>UUID</OCQL>
</sourceExpression>
<ClientProperty>
<name>codeSpace</name>
<value>CODESPACE</value>
</ClientProperty>
</AttributeMapping>
<AttributeMapping>
<targetAttribute>feat:timeSlice</targetAttribute>
<sourceExpression>
<OCQL>REC_ID</OCQL>
<linkElement>feat_UnitTimeSlice</linkElement>
<linkField>FEATURE_LINK</linkField>
</sourceExpression>
<isMultiple>true</isMultiple>
</AttributeMapping>
</attributeMappings>
</FeatureTypeMapping>
<FeatureTypeMapping>
<mappingName>feat_UnitTimeSlice</mappingName>
<sourceDataStore>datastore</sourceDataStore>
<sourceType>UNIT_TS_VIEW</sourceType>
<targetElement>feat:UnitTimeSlice</targetElement>
<isDenormalised>true</isDenormalised>
<attributeMappings>
<AttributeMapping>
<targetAttribute>feat:UnitTimeSlice</targetAttribute>
<idExpression>
<OCQL>strConcat('TimeSlice.',REC_ID)</OCQL>
</idExpression>
</AttributeMapping>
<AttributeMapping>
<targetAttribute>FEATURE_LINK</targetAttribute>
<sourceExpression>
<OCQL>UNIT_REC_ID</OCQL>
</sourceExpression>
</AttributeMapping>
<!-Rest of the attribute mappings for
UnitTimeSlice -->
</attributeMappings>
</FeatureTypeMapping>
---------------------------------------------------------------
Michael Stein, Northrop Grumman Defense Systems
7555 Colshire Dr 4098S
McLean, VA 22102
703-963-6654(cell); 301-429-5468(ofc)
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