diff --git a/pmd-core/src/main/java/net/sourceforge/pmd/util/ClasspathClassLoader.java b/pmd-core/src/main/java/net/sourceforge/pmd/util/ClasspathClassLoader.java
index 3360d9258c..d5324bcb50 100644
--- a/pmd-core/src/main/java/net/sourceforge/pmd/util/ClasspathClassLoader.java
+++ b/pmd-core/src/main/java/net/sourceforge/pmd/util/ClasspathClassLoader.java
@@ -49,7 +49,7 @@ public class ClasspathClassLoader extends URLClassLoader {
         List<URL> urlList = new ArrayList<>();
 
         for (File f : files) {
-            addFileURLs(urlList, f.toURI().toURL());
+            urlList.add(f.toURI().toURL());
         }
         return urlList.toArray(new URL[urlList.size()]);
     }
diff --git a/pmd-ui/src/main/java/net/sourceforge/pmd/util/fxdesigner/SourceEditorController.java b/pmd-ui/src/main/java/net/sourceforge/pmd/util/fxdesigner/SourceEditorController.java
index b637438371..f63a20e5e2 100644
--- a/pmd-ui/src/main/java/net/sourceforge/pmd/util/fxdesigner/SourceEditorController.java
+++ b/pmd-ui/src/main/java/net/sourceforge/pmd/util/fxdesigner/SourceEditorController.java
@@ -78,7 +78,7 @@ public class SourceEditorController implements Initializable, SettingsOwner {
     private Var<List<File>> auxclasspathFiles = Var.newSimpleVar(Collections.emptyList());
     private final Val<ClassLoader> auxclasspathClassLoader = auxclasspathFiles.map(files -> {
         try {
-            new ClasspathClassLoader(files, SourceEditorController.class.getClassLoader());
+            return new ClasspathClassLoader(files, SourceEditorController.class.getClassLoader());
         } catch (IOException e) {
             e.printStackTrace();
         }
@@ -192,7 +192,7 @@ public class SourceEditorController implements Initializable, SettingsOwner {
     }
 
 
-    public void setAuxClassPathFiles(String files) {
+    public void setAuxclasspathFiles(String files) {
         List<File> newVal = Arrays.asList(files.split(File.pathSeparator)).stream().map(File::new).collect(Collectors.toList());
         auxclasspathFiles.setValue(newVal);
     }