diff --git a/src/main/java/de/gwdg/metadataqa/api/calculator/AnnotationCalculator.java b/src/main/java/de/gwdg/metadataqa/api/calculator/AnnotationCalculator.java
index 9afd75d2..d7f6ace9 100644
--- a/src/main/java/de/gwdg/metadataqa/api/calculator/AnnotationCalculator.java
+++ b/src/main/java/de/gwdg/metadataqa/api/calculator/AnnotationCalculator.java
@@ -8,7 +8,6 @@
 
 import java.io.Serializable;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
diff --git a/src/main/java/de/gwdg/metadataqa/api/configuration/MeasurementConfiguration.java b/src/main/java/de/gwdg/metadataqa/api/configuration/MeasurementConfiguration.java
index 4d5cc397..0761fbae 100644
--- a/src/main/java/de/gwdg/metadataqa/api/configuration/MeasurementConfiguration.java
+++ b/src/main/java/de/gwdg/metadataqa/api/configuration/MeasurementConfiguration.java
@@ -676,7 +676,7 @@ public MeasurementConfiguration withAnnotationColumns(String jsonString) {
     ObjectMapper mapper = new ObjectMapper();
     annottaionColumns = new LinkedHashMap<>();
     try {
-      Map<String, Object> map = (Map<String, Object>) mapper.readValue(jsonString, Map.class);
+      Map<String, Object> map = mapper.readValue(jsonString, Map.class);
       for (Map.Entry<String, Object> entry : map.entrySet()) {
         Object value = entry.getValue();
         if (value instanceof String || value instanceof Integer || value instanceof Double)
diff --git a/src/main/java/de/gwdg/metadataqa/api/json/DataElement.java b/src/main/java/de/gwdg/metadataqa/api/json/DataElement.java
index cfd95a0b..162557da 100644
--- a/src/main/java/de/gwdg/metadataqa/api/json/DataElement.java
+++ b/src/main/java/de/gwdg/metadataqa/api/json/DataElement.java
@@ -2,7 +2,6 @@
 
 import de.gwdg.metadataqa.api.configuration.schema.Rule;
 import de.gwdg.metadataqa.api.model.Category;
-import de.gwdg.metadataqa.api.rule.singlefieldchecker.MinCountChecker;
 import de.gwdg.metadataqa.api.schema.Format;
 import de.gwdg.metadataqa.api.schema.Schema;
 import org.apache.commons.lang3.SerializationUtils;
@@ -254,12 +253,12 @@ public String toString() {
   }
 
   public static DataElement copy(DataElement other) throws CloneNotSupportedException {
-    DataElement cloned = (DataElement) SerializationUtils.clone(other);
+    DataElement cloned = SerializationUtils.clone(other);
 
     if (other.children != null && !other.children.isEmpty()) {
       List<DataElement> clonedChildren = new ArrayList<>();
       for (DataElement child : other.children) {
-        DataElement clonedChild = (DataElement) SerializationUtils.clone(child);
+        DataElement clonedChild = SerializationUtils.clone(child);
         clonedChild.parent = cloned;
         clonedChildren.add(clonedChild);
       }
diff --git a/src/main/java/de/gwdg/metadataqa/api/model/selector/SelectorFactory.java b/src/main/java/de/gwdg/metadataqa/api/model/selector/SelectorFactory.java
index dcb8fe4e..86810575 100644
--- a/src/main/java/de/gwdg/metadataqa/api/model/selector/SelectorFactory.java
+++ b/src/main/java/de/gwdg/metadataqa/api/model/selector/SelectorFactory.java
@@ -1,10 +1,6 @@
 package de.gwdg.metadataqa.api.model.selector;
 
 import de.gwdg.metadataqa.api.model.XmlFieldInstance;
-import de.gwdg.metadataqa.api.model.selector.CsvSelector;
-import de.gwdg.metadataqa.api.model.selector.JsonSelector;
-import de.gwdg.metadataqa.api.model.selector.Selector;
-import de.gwdg.metadataqa.api.model.selector.XmlSelector;
 import de.gwdg.metadataqa.api.schema.Format;
 
 import java.util.Map;
diff --git a/src/main/java/de/gwdg/metadataqa/api/util/Converter.java b/src/main/java/de/gwdg/metadataqa/api/util/Converter.java
index ef524ae5..8eeb63a3 100644
--- a/src/main/java/de/gwdg/metadataqa/api/util/Converter.java
+++ b/src/main/java/de/gwdg/metadataqa/api/util/Converter.java
@@ -68,13 +68,13 @@ public static Integer asInteger(Object value) {
         intValue = (Integer) value;
         break;
       case "java.lang.Double":
-        intValue = (Integer) ((Long) Math.round((Double) value)).intValue();
+        intValue = ((Long) Math.round((Double) value)).intValue();
         break;
       case "java.lang.Long":
-        intValue = (Integer) ((Long) value).intValue();
+        intValue = ((Long) value).intValue();
         break;
       case "java.lang.Float":
-        intValue = (Integer) Math.round((float)value);
+        intValue = Math.round((float)value);
         break;
       case "java.lang.String":
         intValue = asInteger(Double.parseDouble((String)value));
diff --git a/src/test/java/de/gwdg/metadataqa/api/calculator/CompletenessCalculatorLimitedTest.java b/src/test/java/de/gwdg/metadataqa/api/calculator/CompletenessCalculatorLimitedTest.java
index d95ccaff..9da67bd2 100644
--- a/src/test/java/de/gwdg/metadataqa/api/calculator/CompletenessCalculatorLimitedTest.java
+++ b/src/test/java/de/gwdg/metadataqa/api/calculator/CompletenessCalculatorLimitedTest.java
@@ -155,6 +155,13 @@ public void testExistenceMap() throws URISyntaxException, IOException {
       if (existing)
         existingFieldCounter++;
     assertEquals(14, existingFieldCounter);
+  }
+
+  @Test
+  public void testExistenceMap_2() throws URISyntaxException, IOException {
+    calculator.collectFields(true);
+    calculator.measure(cache);
+    Map<String, Boolean> existenceMap = calculator.getExistenceMap();
 
     assertTrue(existenceMap.get("edm:ProvidedCHO/@about"));
     assertTrue(existenceMap.get("Proxy/dc:title"));