diff --git a/src/main/java/de/ids_mannheim/korap/KorapCollection.java b/src/main/java/de/ids_mannheim/korap/KorapCollection.java
index bebd668..49b0aed 100644
--- a/src/main/java/de/ids_mannheim/korap/KorapCollection.java
+++ b/src/main/java/de/ids_mannheim/korap/KorapCollection.java
@@ -83,20 +83,7 @@
 	this.filter = new ArrayList<FilterOperation>(5);
     };
 
-    // Create a collection based on UIDs
-    public KorapCollection (String ... uids) {
-	this.filter = new ArrayList<FilterOperation>(5);
-	BooleanFilter filter = new BooleanFilter();
-	if (DEBUG)
-	    log.debug("UID based collection: {},{}", uids[0], uids[1]);
-	filter.or("UID", uids);
-	if (DEBUG)
-	    log.debug("UID based filter: {}", filter.toString());
-	this.filter(filter);
-    };
-
-
-    public void fromJSON(JsonNode json) throws QueryException {
+    public void fromJSON (JsonNode json) throws QueryException {
 	String type = json.get("@type").asText();
 
 	if (type.equals("korap:meta-filter")) {
@@ -124,10 +111,12 @@
     public KorapCollection filter (BooleanFilter filter) {
 	if (DEBUG)
 	    log.trace("Added filter: {}", filter.toString());
+
 	if (filter == null) {
 	    log.warn("No filter is given");
 	    return this;
 	};
+
 	Filter f = (Filter) new QueryWrapperFilter(filter.toQuery());
 	if (f == null) {
 	    log.warn("Filter can't be wrapped");
@@ -143,6 +132,16 @@
 	return this;
     };
 
+    // Filter based on UIDs
+    public KorapCollection filterUIDs (String ... uids) {
+	BooleanFilter filter = new BooleanFilter();
+	filter.or("UID", uids);
+	if (DEBUG)
+	    log.debug("UID based filter: {}", filter.toString());
+	return this.filter(filter);
+    };
+
+
     public KorapCollection filter (KorapFilter filter) {
 	return this.filter(filter.toBooleanFilter());
     };
diff --git a/src/main/java/de/ids_mannheim/korap/KorapFilter.java b/src/main/java/de/ids_mannheim/korap/KorapFilter.java
index f9052d9..17a5dd4 100644
--- a/src/main/java/de/ids_mannheim/korap/KorapFilter.java
+++ b/src/main/java/de/ids_mannheim/korap/KorapFilter.java
@@ -88,14 +88,10 @@
 	filter = new BooleanFilter();
     };
 
-
     public KorapFilter (JsonNode json) throws QueryException {
 	filter = this.fromJSON(json, "tokens");
     };
 
-
-    /*
-    */
 	/*
 	String type = json.get("@type").asText();
 	String field = _getField(json);
diff --git a/src/main/java/de/ids_mannheim/korap/KorapIndex.java b/src/main/java/de/ids_mannheim/korap/KorapIndex.java
index f99da41..d95919f 100644
--- a/src/main/java/de/ids_mannheim/korap/KorapIndex.java
+++ b/src/main/java/de/ids_mannheim/korap/KorapIndex.java
@@ -1079,9 +1079,10 @@
 
 	this.termContexts = new HashMap<Term, TermContext>();
 
+	// Get the spanquery from the KorapSearch object
 	SpanQuery query = ks.getQuery();
 
-	// Get the field of textual data and annotations
+	// Get the field of textual data and annotations ("tokens")
 	String field = query.getField();
 
 	// Todo: Make kr subclassing ks - so ks has a method for a new KorapResult!
@@ -1092,36 +1093,37 @@
 	    ks.getContext()
 	);
 
+	// Set version info to result
 	if (this.getVersion() != null)
 	    kr.setVersion(this.getVersion());
 
+	// The following fields should be lifted for matches
 	HashSet<String> fieldsToLoadLocal = new HashSet<>(fieldsToLoad);
 	fieldsToLoadLocal.add(field);
 
-	int i                  = 0;
-	long t1                = 0,
-	     t2                = 0;
-	int startIndex         = kr.getStartIndex();
-	int count              = kr.getItemsPerPage();
-	int hits               = kr.itemsPerPage() + startIndex;
-	int limit              = ks.getLimit();
-	boolean cutoff         = ks.doCutOff();
-	short itemsPerResource = ks.getItemsPerResource();
+	// Some initializations ...
+	int i                       = 0,
+  	    startIndex              = kr.getStartIndex(),
+	    count                   = kr.getItemsPerPage(),
+	    hits                    = kr.itemsPerPage() + startIndex,
+	    limit                   = ks.getLimit(),
+	    itemsPerResourceCounter = 0;
+	boolean cutoff              = ks.doCutOff();
+	short itemsPerResource      = ks.getItemsPerResource();
 
 	// Check if there is work to do at all
 	if (limit > 0) {
 	    if (hits > limit)
 		hits = limit;
 
-	    // Nah - nothing to do! \o/
+	    // Nah - nothing to do! Let's go shopping!
 	    if (limit < startIndex)
 		return kr;
 	};
 
+	// Collect matches from atomic readers
 	ArrayList<KorapMatch> atomicMatches = new ArrayList<KorapMatch>(kr.itemsPerPage());
 
-	int itemsPerResourceCounter = 0;
-
 	try {
 
 	    // Rewrite query (for regex and wildcard queries)
@@ -1131,6 +1133,9 @@
 		query = (SpanQuery) rewrittenQuery;
 	    };
 
+	    // See: http://www.ibm.com/developerworks/java/library/j-benchmark1/index.html
+	    long t1 = System.nanoTime();
+
 	    for (AtomicReaderContext atomic : this.reader().leaves()) {
 
 		int oldLocalDocID = -1;
@@ -1150,16 +1155,13 @@
 
 		// TODO: Get document information from Cache!
 
-		// See: http://www.ibm.com/developerworks/java/library/j-benchmark1/index.html
-		t1 = System.nanoTime();
-
-		for (; i < hits; i++) {
+		for (; i < hits;i++) {
 
 		    if (DEBUG)
 			log.trace("Match Nr {}/{}", i, count);
 
 		    // There are no more spans to find
-		    if (spans.next() != true)
+		    if (!spans.next())
 			break;
 
 		    int localDocID = spans.doc();
@@ -1218,12 +1220,6 @@
 		    atomicMatches.add(match);
 		};
 
-		// Benchmark till now
-		if (kr.getBenchmarkSearchResults() == null) {
-		    t2 = System.nanoTime();
-		    kr.setBenchmarkSearchResults(t1, t2);
-		};
-
 		// Can be disabled TEMPORARILY
 		while (!cutoff && spans.next()) {
 		    if (limit > 0 && i >= limit)
@@ -1232,17 +1228,23 @@
 		    // Count hits per resource
 		    if (itemsPerResource > 0) {
 			int localDocID = spans.doc();
+
+			if (localDocID == DocIdSetIterator.NO_MORE_DOCS)
+			    break;
 			
 			// IDS are identical
 			if (localDocID == oldLocalDocID || oldLocalDocID == -1) {
-			    if (itemsPerResourceCounter++ >= itemsPerResource)
+			    if (localDocID == -1)
+				break;
+
+			    if (itemsPerResourceCounter++ >= itemsPerResource) {
 				if (spans.skipTo(localDocID + 1) != true) {
 				    break;
-				}
-				else {
-				    itemsPerResourceCounter = 1;
-				    localDocID = spans.doc();
 				};
+				itemsPerResourceCounter = 1;
+				localDocID = spans.doc();
+				// continue;
+			    };
 			}
 
 			// Reset counter
@@ -1251,17 +1253,12 @@
 
 			oldLocalDocID = localDocID;
 		    };
-
 		    i++;
 		};
 		atomicMatches.clear();
 	    };
 
-	    t1 = System.nanoTime();
-	    kr.setBenchmarkHitCounter(t2, t1);
-	    if (kr.getBenchmarkSearchResults() == null) {
-		kr.setBenchmarkSearchResults(t2, t1);
-	    };
+	    kr.setBenchmark(t1, System.nanoTime());
 
 	    if (itemsPerResource > 0)
 		kr.setItemsPerResource(itemsPerResource);
@@ -1269,7 +1266,7 @@
 	    kr.setTotalResults(cutoff ? -1 : i);
 	}
 	catch (IOException e) {
-	    kr.setError("There was an IO error");
+	    kr.setError(600, e.getLocalizedMessage());
 	    log.warn( e.getLocalizedMessage() );
 	};
 
@@ -1379,11 +1376,11 @@
 		};
 	    };
 
-	    mc.setBenchmarkHitCounter(System.nanoTime(), t1);
+	    mc.setBenchmark(t1, System.nanoTime());
 	}
 	catch (IOException e) {
-	    mc.setError("There was an IO error");
-	    log.warn( e.getLocalizedMessage() );
+	    mc.setError(600, e.getLocalizedMessage());
+	    log.warn(e.getLocalizedMessage());
 	};
 
 	mc.commit();
diff --git a/src/main/java/de/ids_mannheim/korap/KorapResult.java b/src/main/java/de/ids_mannheim/korap/KorapResult.java
index fd70547..852710c 100644
--- a/src/main/java/de/ids_mannheim/korap/KorapResult.java
+++ b/src/main/java/de/ids_mannheim/korap/KorapResult.java
@@ -1,12 +1,16 @@
 package de.ids_mannheim.korap;
 
-import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+
 import de.ids_mannheim.korap.index.PositionsToOffset;
 import de.ids_mannheim.korap.index.SearchContext;
+import de.ids_mannheim.korap.server.KorapResponse;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -16,16 +20,18 @@
 /*
 TODO: Reuse the KorapSearch code for data serialization!
 */
-
-public class KorapResult {
+@JsonInclude(Include.NON_NULL)
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class KorapResult extends KorapResponse {
     ObjectMapper mapper = new ObjectMapper();
 
+    @JsonIgnore
     public static final short ITEMS_PER_PAGE = 25;
+
     private String query;
 
     private List<KorapMatch> matches;
 
-    private int totalResults = 0;
     private int startIndex = 0;
 
     private SearchContext context;
@@ -37,7 +43,6 @@
             benchmarkHitCounter;
     private String error = null;
     private String warning = null;
-    private String version;
 
     private JsonNode request;
 
@@ -46,7 +51,9 @@
     private final static Logger log = LoggerFactory.getLogger(KorapMatch.class);
 
     // Empty result
-    public KorapResult() {}
+    public KorapResult() {
+        mapper.enable(SerializationFeature.INDENT_OUTPUT);
+    };
 
     public KorapResult(String query,
                        int startIndex,
@@ -55,7 +62,7 @@
 
         mapper.enable(SerializationFeature.INDENT_OUTPUT);
         // mapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
-        mapper.disable(SerializationFeature.WRITE_NULL_MAP_VALUES);
+        // mapper.disable(SerializationFeature.WRITE_NULL_MAP_VALUES);
 
         this.matches = new ArrayList<>(itemsPerPage);
         this.query = query;
@@ -97,37 +104,11 @@
         return km;
     }
 
-
-    public void setTotalResults(int i) {
-        this.totalResults = i;
-    }
-
-
-    public int getTotalResults() {
-        return this.totalResults;
-    }
-
-
     @Deprecated
     public int totalResults() {
-        return this.totalResults;
+        return this.getTotalResults();
     }
 
-
-    @JsonIgnore
-    public void setVersion(String version) {
-        this.version = version;
-    }
-
-
-    @JsonIgnore
-    public String getVersion() {
-        if (this.version == null)
-            return null;
-        return "lucene-backend-" + this.version;
-    }
-
-
     public short getItemsPerPage() {
         return this.itemsPerPage;
     }
@@ -158,7 +139,11 @@
 	    this.warning += "; " + warning;
     };
 
+    public void setWarning (String warning) {
+	this.warning = warning;
+    };
 
+    @JsonIgnore
     public void setRequest(JsonNode request) {
         this.request = request;
     }
@@ -168,25 +153,33 @@
         return this.request;
     }
 
-
+    /*
+    @JsonIgnore
     public void setBenchmarkSearchResults(long t1, long t2) {
         this.benchmarkSearchResults =
                 (t2 - t1) < 100_000_000 ? (((double) (t2 - t1) * 1e-6) + " ms") :
                         (((double) (t2 - t1) / 1000000000.0) + " s");
-    }
+    };
 
+    public void setBenchmarkSearchResults(String bm) {
+	this.benchmarkSearchResults = bm;
+    };
 
     public String getBenchmarkSearchResults() {
         return this.benchmarkSearchResults;
     }
+    */
 
-
+    @JsonIgnore
     public void setBenchmarkHitCounter(long t1, long t2) {
         this.benchmarkHitCounter =
                 (t2 - t1) < 100_000_000 ? (((double) (t2 - t1) * 1e-6) + " ms") :
                         (((double) (t2 - t1) / 1000000000.0) + " s");
-    }
+    };
 
+    public void setBenchmarkHitCounter(String bm) {
+	this.benchmarkHitCounter = bm;
+    };
 
     public String getBenchmarkHitCounter() {
         return this.benchmarkHitCounter;
@@ -196,22 +189,25 @@
 	this.itemsPerResource = value;
     };
 
-    @JsonIgnore
+    public void setItemsPerResource (int value) {
+	this.itemsPerResource = (short) value;
+    };
+
+    // @JsonIgnore
     public short getItemsPerResource () {
 	return this.itemsPerResource;
     };
 
-
     public String getQuery() {
         return this.query;
     }
 
-
+    @JsonIgnore
     public KorapMatch getMatch(int index) {
         return this.matches.get(index);
     }
 
-
+    @JsonIgnore
     public List<KorapMatch> getMatches() {
         return this.matches;
     }
@@ -228,6 +224,7 @@
     }
 
 
+    @JsonIgnore
     public KorapResult setContext(SearchContext context) {
         this.context = context;
         return this;
@@ -250,8 +247,8 @@
 	if (this.itemsPerResource > 0)
 	    json.put("itemsPerResource", this.itemsPerResource);
 
-        if (this.version != null)
-            json.put("version", this.version);
+        if (this.getVersion() != null)
+            json.put("version", this.getVersion());
 
         try {
             return mapper.writeValueAsString(json);
@@ -261,7 +258,5 @@
 
 
         return "{}";
-    }
-
-
+    };
 };
diff --git a/src/main/java/de/ids_mannheim/korap/index/MatchCollector.java b/src/main/java/de/ids_mannheim/korap/index/MatchCollector.java
index 8c2faaf..e1e93e3 100644
--- a/src/main/java/de/ids_mannheim/korap/index/MatchCollector.java
+++ b/src/main/java/de/ids_mannheim/korap/index/MatchCollector.java
@@ -1,9 +1,32 @@
 package de.ids_mannheim.korap.index;
 import de.ids_mannheim.korap.KorapMatch;
+import de.ids_mannheim.korap.server.KorapResponse;
 import java.util.*;
 
-public interface MatchCollector {
-    public void add (int uniqueDocID, int matchcount);
+public class MatchCollector extends KorapResponse {
+    public int totalResultDocs = 0;
+
+    public void add (int uniqueDocID, int matchcount) {
+	this.totalResultDocs++;
+	this.incrTotalResults(matchcount);
+    };
+
+    public MatchCollector setTotalResultDocs (int i) {
+	this.totalResultDocs = i;
+	return this;
+    };
+
+    public MatchCollector incrTotalResultDocs (int i) {
+	this.totalResultDocs += i;
+	return this;
+    };
+
+    public int getTotalResultDocs () {
+	return totalResultDocs;
+    };
+
+    public void commit() {};
+
 
     /*
      * The following methods are shared and should be used from KorapResult
@@ -11,11 +34,4 @@
      * getQueryHash
      * getNode
      */
-
-    public void setError(String s);
-    public void setBenchmarkHitCounter(long t1, long t2);
-    public int getMatchCount ();
-    public int getDocumentCount ();
-    public String toJSON();
-    public void commit();
 };
diff --git a/src/main/java/de/ids_mannheim/korap/index/collector/MatchCollectorDB.java b/src/main/java/de/ids_mannheim/korap/index/collector/MatchCollectorDB.java
index 9c35b6f..b7d212e 100644
--- a/src/main/java/de/ids_mannheim/korap/index/collector/MatchCollectorDB.java
+++ b/src/main/java/de/ids_mannheim/korap/index/collector/MatchCollectorDB.java
@@ -3,20 +3,15 @@
 import de.ids_mannheim.korap.index.MatchCollector;
 import java.util.*;
 
-public class MatchCollectorDB implements MatchCollector {
+public class MatchCollectorDB extends MatchCollector {
 
     /*
       Todo: In case there are multiple threads searching,
       the list should be synchrinized Collections.synchronizedList()
      */
-
-    private String error;
-    private int doccount = 0;
-    private int matchcount = 0;
-    private int doccollect = 0;
-
     private List matchCollector;
     private int bufferSize;
+    private int doccollect;
 
     private String tableName;
 
@@ -33,33 +28,13 @@
      * Add matches till the bufferSize exceeds - then commit to the database.
      */
     public void add (int uniqueDocID, int matchcount) {
-	this.doccount++;
-	this.matchcount += matchcount;
+	this.incrTotalResultDocs(1);
+	this.incrTotalResults(matchcount);
 	this.matchCollector.add(new int[]{uniqueDocID, matchcount});
 	if (this.doccollect++ > bufferSize)
 	    this.commit();
     };
 
-    public void setError(String msg) {
-        this.error = msg;
-    };
-
-    public void setBenchmarkHitCounter(long t1, long t2) {
-    };
-
-    public int getMatchCount () {
-	return matchcount;
-    };
-
-    public int getDocumentCount () {
-	return doccount;
-    };
-
-    public String toJSON () {
-	// This may also be a commit!
-	return "{ \"documents\" : " + doccount + ", \"matches\" : " + matchcount + " }";
-    };
-
     public void commit () {
 	
 	this.matchCollector.clear();
diff --git a/src/main/java/de/ids_mannheim/korap/index/collector/MatchCollectorTest.java b/src/main/java/de/ids_mannheim/korap/index/collector/MatchCollectorTest.java
deleted file mode 100644
index 9935919..0000000
--- a/src/main/java/de/ids_mannheim/korap/index/collector/MatchCollectorTest.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package de.ids_mannheim.korap.index.collector;
-import de.ids_mannheim.korap.index.MatchCollector;
-import de.ids_mannheim.korap.KorapMatch;
-import java.util.*;
-
-public class MatchCollectorTest implements MatchCollector {
-
-    private String error;
-    private int doccount = 0;
-    private int matchcount = 0;
-
-    public void add (int uniqueDocID, int matchcount) {
-	this.doccount++;
-	this.matchcount += matchcount;
-    };
-
-    public void setError(String msg) {
-        this.error = msg;
-    };
-
-    public void setBenchmarkHitCounter(long t1, long t2) {
-    };
-
-    public int getMatchCount () {
-	return matchcount;
-    };
-
-    public int getDocumentCount () {
-	return doccount;
-    };
-
-    public String toJSON () {
-	// This is also a commit!
-	return "{ \"documents\" : " + doccount + ", \"matches\" : " + matchcount + " }";
-    };
-
-    public void commit() {
-    };
-};
diff --git a/src/main/java/de/ids_mannheim/korap/server/KorapResponse.java b/src/main/java/de/ids_mannheim/korap/server/KorapResponse.java
index 63e55bd..ccca3bd 100644
--- a/src/main/java/de/ids_mannheim/korap/server/KorapResponse.java
+++ b/src/main/java/de/ids_mannheim/korap/server/KorapResponse.java
@@ -1,4 +1,5 @@
 package de.ids_mannheim.korap.server;
+
 import java.util.*;
 import java.io.*;
 
@@ -15,11 +16,14 @@
 */
 
 @JsonInclude(Include.NON_NULL)
+@JsonIgnoreProperties(ignoreUnknown = true)
 public class KorapResponse {
     ObjectMapper mapper = new ObjectMapper();
 
     private String errstr, msg, version, node;
-    private int err, unstaged = 0;
+    private int err, unstaged;
+    private int totalResults = 0;
+    private String benchmark;
 
     public KorapResponse (String node, String version) {
 	this.setNode(node);
@@ -28,6 +32,11 @@
 
     public KorapResponse () {};
 
+    @JsonIgnore
+    public KorapResponse setError (int code, String msg) {
+	return this.setErrstr(msg).setErr(code);
+    };
+
     public KorapResponse setErrstr (String msg) {
 	this.errstr = msg;
 	return this;
@@ -82,6 +91,39 @@
 	return this;
     };
 
+    public KorapResponse setTotalResults (int i) {
+        this.totalResults = i;
+	return this;
+    };
+
+    public KorapResponse incrTotalResults (int i) {
+        this.totalResults += i;
+	return this;
+    };
+
+
+    public int getTotalResults() {
+        return this.totalResults;
+    };
+
+    @JsonIgnore
+    public KorapResponse setBenchmark (long t1, long t2) {
+        this.benchmark =
+                (t2 - t1) < 100_000_000 ? (((double) (t2 - t1) * 1e-6) + " ms") :
+                        (((double) (t2 - t1) / 1000000000.0) + " s");
+	return this;
+    };
+
+    public KorapResponse setBenchmark (String bm) {
+	this.benchmark = bm;
+	return this;
+    };
+
+    public String getBenchmark () {
+        return this.benchmark;
+    };
+
+
     // Serialize
     public String toJSON () {
 	ObjectNode json =  (ObjectNode) mapper.valueToTree(this);
diff --git a/src/main/java/de/ids_mannheim/korap/server/Resource.java b/src/main/java/de/ids_mannheim/korap/server/Resource.java
index 0577d93..94e72e5 100644
--- a/src/main/java/de/ids_mannheim/korap/server/Resource.java
+++ b/src/main/java/de/ids_mannheim/korap/server/Resource.java
@@ -169,20 +169,26 @@
 	    // Get query parameters
 	    MultivaluedMap<String,String> qp = uri.getQueryParameters();
 
-	    // Build Collection based on a list of uids
-	    KorapCollection kc = new KorapCollection(
-	      qp.get("uid").toArray(new String[0])
-            );
+	    if (qp.get("uid") != null) {
 
-	    // TODO: RESTRICT COLLECTION TO ONLY RESPECT SELF DOCS (REPLICATION)
+		// Build Collection based on a list of uids
+		List<String> uids = qp.get("uid");
+		KorapCollection kc = new KorapCollection();
+		kc.filterUIDs(uids.toArray(new String[uids.size()]));
 
-	    // Override old collection
-	    ks.setCollection(kc);
+		// TODO: RESTRICT COLLECTION TO ONLY RESPECT SELF DOCS (REPLICATION)
 
-	    // Only return the first match per text
-	    ks.setItemsPerResource(1);
+		// Override old collection
+		ks.setCollection(kc);
 
-            return ks.run(index).toJSON();
+		// Only return the first match per text
+		ks.setItemsPerResource(1);
+
+		return ks.run(index).toJSON();
+	    };
+	    KorapResult kr = new KorapResult();
+	    kr.setError("No UUIDs given");
+	    return kr.toJSON();
 	};
 	// Response with error message
         KorapResult kr = new KorapResult();
diff --git a/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java b/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java
index ba62e86..3fa1ea9 100644
--- a/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java
+++ b/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java
@@ -17,7 +17,6 @@
 
 import static org.junit.Assert.*;
 import org.junit.Test;
-import org.junit.Ignore;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
@@ -42,10 +41,11 @@
 	// Create Virtual collections:
 	KorapCollection kc = new KorapCollection(ki);
 
-	// The virtual collection consists of all documents that have the textClass "reisen" and "freizeit"
-
 	assertEquals("Documents", 7, kc.numberOf("documents"));
 
+	// The virtual collection consists of all documents that have
+	// the textClass "reisen" and "freizeit"
+
 	kc.filter( kf.and("textClass", "reisen").and("textClass", "freizeit-unterhaltung") );
 
 	assertEquals("Documents", 5, kc.numberOf("documents"));
@@ -73,7 +73,6 @@
 	SpanQuery query = kq.seg("opennlp/p:NN").with("tt/p:NN").toQuery();
 
 	KorapResult kr = kc.search(query);
-
 	assertEquals(70, kr.totalResults());
 
 	kc.extend( kf.and("textClass", "uninteresting") );
@@ -96,7 +95,13 @@
 	// Construct index
 	KorapIndex ki = new KorapIndex();
 	// Indexing test files
-	for (String i : new String[] {"00001", "00002", "00003", "00004", "00005", "00006", "02439"}) {
+	for (String i : new String[] {"00001",
+				      "00002",
+				      "00003",
+				      "00004",
+				      "00005",
+				      "00006",
+				      "02439"}) {
 	    ki.addDocFile(
 	      getClass().getResource("/wiki/" + i + ".json.gz").getFile(), true
             );
@@ -110,17 +115,16 @@
 
 	assertEquals("Documents", 7, kc.numberOf("documents"));
 
-	/*
-	  If this is set - everything is fine automatically ...
+	// If this is set - everything is fine automatically ...
 	kc.filter(kf.and("corpusID", "WPD"));
 	assertEquals("Documents", 7, kc.numberOf("documents"));
-	*/
+
 
 	// The virtual collection consists of all documents that have the textClass "reisen" and "freizeit"
+
 	kc.filter( kf.and("textClass", "reisen").and("textClass", "freizeit-unterhaltung") );
 
 	assertEquals("Documents", 5, kc.numberOf("documents"));
-
 	assertEquals("Tokens", 1678, kc.numberOf("tokens"));
 	assertEquals("Sentences", 194, kc.numberOf("sentences"));
 	assertEquals("Paragraphs", 139, kc.numberOf("paragraphs"));
@@ -133,6 +137,7 @@
 	assertEquals("Sentences", 75, kc.numberOf("sentences"));
 	assertEquals("Paragraphs", 48, kc.numberOf("paragraphs"));
 
+	// This is already filtered though ...
 	kc.filter(kf.and("corpusID", "WPD"));
 
 	assertEquals("Documents", 1, kc.numberOf("documents"));
@@ -153,12 +158,9 @@
 	kc.extend( kf.and("textClass", "wissenschaft") );
 
 	assertEquals("Documents", 3, kc.numberOf("documents"));
-	/*
 	assertEquals("Tokens", 1669, kc.numberOf("tokens"));
 	assertEquals("Sentences", 188, kc.numberOf("sentences"));
 	assertEquals("Paragraphs", 130, kc.numberOf("paragraphs"));
-	// System.err.println(kr.toJSON());
-	*/
     };
 
 
@@ -169,7 +171,13 @@
 	// Construct index
 	KorapIndex ki = new KorapIndex();
 	// Indexing test files
-	for (String i : new String[] {"00001", "00002", "00003", "00004", "00005", "00006", "02439"}) {
+	for (String i : new String[] {"00001",
+				      "00002",
+				      "00003",
+				      "00004",
+				      "00005",
+				      "00006",
+				      "02439"}) {
 	  ki.addDocFile(
 	      getClass().getResource("/wiki/" + i + ".json.gz").getFile(), true
             );
@@ -197,8 +205,6 @@
 	assertEquals("Sentences", 40, kc.numberOf("sentences"));
 	assertEquals("Paragraphs", 2, kc.numberOf("paragraphs"));
 
-	//	assertEquals("Documents", 1, kc.numberOf("documents"));
-
 	// Create a query
 	KorapQuery kq = new KorapQuery("tokens");
 	SpanQuery query = kq.seg("opennlp/p:NN").with("tt/p:NN").toQuery();
@@ -232,23 +238,26 @@
 	};
 	ki.commit();
 
-	assertEquals("Documents", 7, ki.numberOf("documents"));
-	assertEquals("Sentences", 281, ki.numberOf("sentences"));
+	assertEquals("Documents",    7, ki.numberOf("documents"));
+	assertEquals("Paragraphs", 174, ki.numberOf("paragraphs"));
+	assertEquals("Sentences",  281, ki.numberOf("sentences"));
+	assertEquals("Tokens",    2661, ki.numberOf("tokens"));
 
 	SpanQuery sq = new SpanTermQuery(new Term("tokens", "s:der"));
 	KorapResult kr = ki.search(sq, (short) 10);
         assertEquals(86,kr.getTotalResults());
 
 	// Create Virtual collections:
-	KorapCollection kc = new KorapCollection(new String[]{"2", "3", "4"});
+	KorapCollection kc = new KorapCollection();
+	kc.filterUIDs(new String[]{"2", "3", "4"});
 	kc.setIndex(ki);
 	assertEquals("Documents", 3, kc.numberOf("documents"));
 
+	assertEquals("Paragraphs", 46, kc.numberOf("paragraphs"));
+	assertEquals("Sentences", 103, kc.numberOf("sentences"));
+	assertEquals("Tokens",   1229, kc.numberOf("tokens"));
+
 	kr = kc.search(sq);
         assertEquals(39,kr.getTotalResults());
     };
 };
-
-
-
-// kc.filter( kf.and("textClass", "kultur").or("textClass", "wissenschaft") );
diff --git a/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java b/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java
index c06592d..e4dccc4 100644
--- a/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java
+++ b/src/test/java/de/ids_mannheim/korap/search/TestKorapSearch.java
@@ -363,6 +363,49 @@
 	assertEquals((short) 1, kr.getItemsPerResource());
     };
 
+    @Test
+    public void searchJSONitemsPerResourceServer () throws IOException {
+
+	/*
+	 * This test is a server-only implementation of
+	 * TestResource#testCollection
+	 */
+
+
+	// Construct index
+	KorapIndex ki = new KorapIndex();
+	// Indexing test files
+	int uid = 1;
+	for (String i : new String[] {"00001",
+				      "00002",
+				      "00003",
+				      "00004",
+				      "00005",
+				      "00006",
+				      "02439"}) {
+	    ki.addDocFile(
+	        uid++,
+		getClass().getResource("/wiki/" + i + ".json.gz").getFile(),
+		true
+            );
+	};
+	ki.commit();
+
+	String json = getString(getClass().getResource("/queries/bsp-uid-example.jsonld").getFile());
+
+	KorapSearch ks = new KorapSearch(json);
+	ks.setItemsPerResource(1);
+	KorapCollection kc = new KorapCollection();
+	kc.filterUIDs(new String[]{"1", "4"});
+	kc.setIndex(ki);
+	ks.setCollection(kc);
+
+	KorapResult kr = ks.run(ki);
+
+	assertEquals(2, kr.getTotalResults());
+	assertEquals(0, kr.getStartIndex());
+	assertEquals(25, kr.getItemsPerPage());
+    };
     
 
     @Test
diff --git a/src/test/java/de/ids_mannheim/korap/server/DBTest.java b/src/test/java/de/ids_mannheim/korap/server/TestDatabase.java
similarity index 93%
rename from src/test/java/de/ids_mannheim/korap/server/DBTest.java
rename to src/test/java/de/ids_mannheim/korap/server/TestDatabase.java
index 11f3a23..04e7603 100644
--- a/src/test/java/de/ids_mannheim/korap/server/DBTest.java
+++ b/src/test/java/de/ids_mannheim/korap/server/TestDatabase.java
@@ -19,7 +19,7 @@
 import org.junit.Test;
 import static org.junit.Assert.assertEquals;
 
-public class DBTest {
+public class TestDatabase {
 
     private Connection conn;
     private Statement stat;
@@ -73,8 +73,8 @@
 	mc.add(9,10);
 	mc.add(16,90);
 	mc.commit();
-	assertEquals(mc.getMatchCount(), 109);
-	assertEquals(mc.getDocumentCount(), 4);
+	assertEquals(mc.getTotalResults(), 109);
+	assertEquals(mc.getTotalResultDocs(), 4);
     };
 
     @After
diff --git a/src/test/java/de/ids_mannheim/korap/server/ResourceTest.java b/src/test/java/de/ids_mannheim/korap/server/TestResource.java
similarity index 70%
rename from src/test/java/de/ids_mannheim/korap/server/ResourceTest.java
rename to src/test/java/de/ids_mannheim/korap/server/TestResource.java
index ee84419..08ae610 100644
--- a/src/test/java/de/ids_mannheim/korap/server/ResourceTest.java
+++ b/src/test/java/de/ids_mannheim/korap/server/TestResource.java
@@ -4,6 +4,9 @@
   http://harryjoy.com/2012/09/08/simple-rest-client-in-java/
 */
 import java.io.*;
+import java.util.ArrayList;
+import java.util.List;
+
 
 import javax.ws.rs.client.Client;
 import javax.ws.rs.client.ClientBuilder;
@@ -12,18 +15,19 @@
 
 import org.glassfish.grizzly.http.server.HttpServer;
 
+import static org.junit.Assert.*;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import static org.junit.Assert.assertEquals;
 
 import java.io.FileInputStream;
 
 import de.ids_mannheim.korap.KorapNode;
+import de.ids_mannheim.korap.KorapResult;
 import de.ids_mannheim.korap.server.KorapResponse;
 import static de.ids_mannheim.korap.util.KorapString.*;
 
-public class ResourceTest {
+public class TestResource {
 
     private HttpServer server;
     private WebTarget target;
@@ -76,12 +80,8 @@
 		put(Entity.json(json), KorapResponse.class);
 
 	    assertEquals(kresp.getNode(), "milena");
-	    /*
-	    assertNull(kresp.getErr());
-	    assertNull(kresp.getErrstr());
-	    */
+	    assertEquals(kresp.getErr(), 0);
 	    assertEquals(kresp.getUnstaged(), unstaged++);
-	    assertEquals(kresp.getVersion(), "0.42");
 	};
 
 	KorapResponse kresp = target.path("/index").
@@ -90,4 +90,38 @@
 	assertEquals(kresp.getNode(), "milena");
 	assertEquals(kresp.getMsg(), "Unstaged data was committed");	
     };
+
+    @Test
+    public void testCollection() throws IOException {
+
+	String json = getString(
+	    getClass().getResource("/queries/bsp-uid-example.jsonld").getFile()
+        );
+
+	 KorapResponse kresp
+	    = target.path("/").
+	    queryParam("uid", "1").
+	    queryParam("uid", "4").
+	    request("application/json").
+	    post(Entity.json(json), KorapResponse.class);
+
+	 assertEquals(2, kresp.getTotalResults());
+	 assertEquals(0, kresp.getErr());
+    };
+
+    public static String getString (String path) {
+	StringBuilder contentBuilder = new StringBuilder();
+	try {
+	    BufferedReader in = new BufferedReader(new FileReader(path));
+	    String str;
+	    while ((str = in.readLine()) != null) {
+		contentBuilder.append(str);
+	    };
+	    in.close();
+	} catch (IOException e) {
+	    fail(e.getMessage());
+	}
+	return contentBuilder.toString();
+    };
+
 };
diff --git a/src/test/resources/queries/bsp-uid-example.jsonld b/src/test/resources/queries/bsp-uid-example.jsonld
new file mode 100644
index 0000000..72f1c53
--- /dev/null
+++ b/src/test/resources/queries/bsp-uid-example.jsonld
@@ -0,0 +1,13 @@
+{
+  "@context": "http://ids-mannheim.de/ns/KorAP/json-ld/v0.1/context.jsonld",
+  "query": {
+    "@type": "korap:token", 
+    "wrap": {
+      "@type": "korap:term", 
+      "foundry": "mate",
+      "layer" : "lemma",
+      "key":"sein", 
+      "match": "match:eq"
+    }
+  }
+}