Filtering by featureid when idExpression is specified results in NPE
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                 Key: GEOT-2696
                 URL: http://jira.codehaus.org/browse/GEOT-2696
             Project: GeoTools
          Issue Type: Bug
          Components: data app-schema
    Affects Versions: 2.6-M2
            Reporter: Rini Angreani
             Fix For: 2.6-M2


Specify id expression for the element:
<attributeMappings>
                                <AttributeMapping>
                                        <targetAttribute>
                                                ex:geomContainer
                                        </targetAttribute>
                                        <idExpression>
                                            <OCQL>getId()</OCQL>
                                        </idExpression>
                                </AttributeMapping>
Run query with feature id filter: 
"wfs?request=GetFeature&typename=ex:geomContainer&featureid=1"

Results:
<ows:Exception exceptionCode="NoApplicableCode">
        <ows:ExceptionText>java.lang.NullPointerException: getFeatureReader 
requires Filter: did you mean Filter.INCLUDE?
getFeatureReader requires Filter: did you mean 
Filter.INCLUDE?</ows:ExceptionText>
    </ows:Exception>

When idExpression is removed from attributeMapping, it's fine. 
        <ows:ExceptionText>java.lang.NullPointerException: getFeatureReader 
requires Filter: did you mean Filter.INCLUDE?

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