Why QGIS WFS doesn't update PostGIS line and polygon layers?

Question

I installed PostgreSQL and PostGIS and created PostGIS layers in GeoServer. But when i want to change geometry in QGIS via WFS it drops an error:

": Error performing insert: java.lang.String cannot be cast to com.vividsolutions.jts.geom.Geometry"

I've read the type of the geometry isn't OK, eg. 'linestring' and 'multilinestring' How could i solve this problem to update my layers?

It is a bug in QGIS and developers are working on it. QGIS tries to insert a linestring even the schema describes that geometry must be a multilinestring. — user30184, May 5 '16 at 16:12
@user30184 would you post that as an answer and include a link to the ticket? thanks — underdark♦, May 5 '16 at 17:57
@user30184 Good news! Hope they can solve this problem soon! So the geometry type causes this bug. — Hadh, May 6 '16 at 7:43

user30184 · Accepted Answer · 2016-05-06 09:39:10Z

The reason for the error is most probably that the geometry type of the WFS feature type is defined to be MultiLinestring or MultiPolygon, but QGIS it trying to insert simple Linestring or Polygon. You can check the WFS geometry type by making a DescribeFeatureType request. For example http://demo.opengeo.org/geoserver/wfs?service=wfs&version=1.0.0&request=describefeaturetype&typename=topp:states is announcing the geometry type as

xsd:element maxOccurs="1" minOccurs="0" name="the_geom" nillable="true" type="gml:MultiPolygonPropertyType"

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