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I solved problem. My layers are created with sql view. When I zoom in level 10 other layers are appearing and one of them is duplicated column name. I get wms request result error like this: Rendering process failed↵java.io.IOException↵null↵ERROR: column reference "name" is ambiguous↵ Position: 117


I made this code for json ftl template, based in a post: This is the code for header.ftl [ This is the code for content.ftl: { "layer": "${type.name}", "features": [ <#list features as feature> { <#list feature.attributes as attribute> <#if !attribute.isGeometry> ...

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