old_id is null natuurlijk....

gistfile1.txt

org.netbeans.modules.viewmodel.TreeModelNode@77e48879[Name=, displayName=attributes]	Map<String,Map<String,Object>>	"size = 3"	

org.netbeans.modules.viewmodel.TreeModelNode@1ce25976[Name=, displayName=[0]]	HashMap$Entry	"buz_t_name => {name=buz_t_name, value=[a*], label=name, type=class java.lang.String}"	

org.netbeans.modules.viewmodel.TreeModelNode@505f60ca[Name=, displayName=[1]]	HashMap$Entry	"buz_t_email => {name=buz_t_email, label=email, type=class java.lang.String}"	

org.netbeans.modules.viewmodel.TreeModelNode@25cb96ff[Name=, displayName=[2]]	HashMap$Entry	"old_id => null"	

public class SolrHelper {
.....
public static SolrQuery generateSolrQuery(Map<String, Map<String, Object>> attributes) {
SolrQuery result = new SolrQuery();

StringBuilder query = new StringBuilder();
List<String> fields = new ArrayList<String>();
boolean firstEmitted = false;
for (String attributeId : attributes.keySet()) {
  fields.add(attributeId);
  Map<String, Object> attribute = attributes.get(attributeId);
  if (attribute.get(Constants.getInstance().ATTRIBUTE_VALUE) != null) {
    query.append(generateSolrQueryAttribute(attribute, firstEmitted));
    firstEmitted = true;
  }
}

....