diff --git a/src/main/java/de/thm/arsnova/dao/CouchDBDao.java b/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
index 17e9c133aec5faee031a06853217b513ad254295..9b60c208a479e1a308400580a3d8851bdf0838db 100644
--- a/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
+++ b/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
@@ -27,17 +27,12 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Date;
-import java.util.HashMap;
-import java.util.HashSet;
 import java.util.List;
-import java.util.Map;
-import java.util.Set;
 
 import net.sf.ezmorph.Morpher;
 import net.sf.ezmorph.MorpherRegistry;
 import net.sf.ezmorph.bean.BeanMorpher;
 import net.sf.json.JSONArray;
-import net.sf.json.JSONException;
 import net.sf.json.JSONObject;
 import net.sf.json.util.JSONUtils;