Viewer with Object Query

The map client configuration

The ViewContext configuration

Further notes

For using the Object Info you need the WMSGetFeatureInfo:

  
  <lc:WMSGetFeatureInfo>
    <infoFormat>text/html</infoFormat>
    <maxFeatures>1</maxFeatures>
    <attributes>Layer</attributes>
    <aliases>Layer Name</aliases>
    <popupTitle>INFO</popupTitle>
	<popupAutoSize>true</popupAutoSize>
	<popupKeepInMap>false</popupKeepInMap>
    <popupType>jQuery</popupType> 
    <popupMaxSize><ol:Size w="350" h="200"/></popupMaxSize>
	<popupMinSize><ol:Size w="350" h="200"/></popupMinSize>
  </lc:WMSGetFeatureInfo>

For WMS requests it is necessary to turn on proxy support

        
	<script type="text/javascript">
          OpenLayers.ProxyHost = '../../servlet/proxy?url=';
    	</script>

More Information in FAQ Proxy