List can be reordered , I'll update the UI by day's end.

I need to still test the classPathLoader @jsotuyod some guidance needed here.

pmd-ui/src/main/java/net/sourceforge/pmd/util/fxdesigner/AuxClassPathController.java

@@ -6,10 +6,13 @@
 package net.sourceforge.pmd.util.fxdesigner;
 
 import java.io.File;
+import java.io.IOException;
 import java.net.URL;
 import java.util.List;
 import java.util.ResourceBundle;
 
+import net.sourceforge.pmd.PMDConfiguration;
+import net.sourceforge.pmd.util.ClasspathClassLoader;
 import net.sourceforge.pmd.util.fxdesigner.util.DesignerUtil;
 import net.sourceforge.pmd.util.fxdesigner.util.beans.SettingsOwner;
 
@@ -27,29 +30,43 @@ import javafx.stage.Stage;
 public class AuxClassPathController implements Initializable, SettingsOwner {
 
     private final DesignerRoot designerRoot;
-
-    @FXML
-    private Button removeFiles;
-    @FXML
-    private Button selectFile;
-    @FXML
-    private ListView<File> fileList;
-    @FXML
-    private final MainDesignerController parent;
+    private ClassLoader classLoader = getClass().getClassLoader();
 
 
-    public AuxClassPathController(DesignerRoot designerRoot, MainDesignerController parent) {
+
+    @FXML
+    private Button removeFileButton;
+    @FXML
+    private Button selectFilesButton;
+    @FXML
+    private ListView<File> fileListView;
+    @FXML
+    private Button moveItemUpButton;
+    @FXML
+    private Button moveItemDownButton;
+    @FXML
+    private Button setClassPathButton;
+
+
+    public AuxClassPathController(DesignerRoot designerRoot) {
         this.designerRoot = designerRoot;
-        this.parent = parent;
     }
 
 
     @Override
     public void initialize(URL location, ResourceBundle resources) {
 
-        selectFile.setOnAction(e -> onSelectFileClicked());
-        removeFiles.setOnAction(e -> onRemoveFileClicked());
-
+        selectFilesButton.setOnAction(e -> onSelectFileClicked());
+        removeFileButton.setOnAction(e -> onRemoveFileClicked());
+        setClassPathButton.setOnAction(e -> {
+            try {
+                setClassPath(classPathGenerator());
+            } catch (IOException e1) {
+                e1.printStackTrace();
+            }
+        });
+        moveItemUpButton.setOnAction(e -> moveUp());
+        moveItemDownButton.setOnAction(e -> moveDown());
     }
 
 
@@ -62,19 +79,86 @@ public class AuxClassPathController implements Initializable, SettingsOwner {
             new FileChooser.ExtensionFilter("Java EARs", "*.ear"),
             new FileChooser.ExtensionFilter("Java class files", "*.class")
         );
-        List<File> file = chooser.showOpenMultipleDialog((designerRoot.getMainStage()));
+        List<File> file = chooser.showOpenMultipleDialog(designerRoot.getMainStage());
         for (File f : file) {
-            fileList.getItems().add(f);
+            fileListView.getItems().add(f);
         }
     }
 
 
     private void onRemoveFileClicked() {
-        File f = fileList.getSelectionModel().getSelectedItem();
-        fileList.getItems().remove(f);
+        File f = fileListView.getSelectionModel().getSelectedItem();
+        fileListView.getItems().remove(f);
     }
 
 
+    private void moveUp() {
+        moveItem(-1);
+    }
+
+
+    private void moveDown() {
+        moveItem(1);
+    }
+
+
+    public void moveItem(int direction) {
+        // Checking selected item
+        if (fileListView.getSelectionModel().getSelectedItem() == null) {
+            return;
+        }
+
+        // Calculate new index using move direction
+        int newIndex = fileListView.getSelectionModel().getSelectedIndex() + direction;
+
+        if (newIndex < 0 || newIndex >= fileListView.getItems().size()) {
+            return;
+        }
+
+        File selected = fileListView.getSelectionModel().getSelectedItem();
+
+        // Removing removable element
+        fileListView.getItems().remove(selected);
+        // Insert it in new position
+        fileListView.getItems().add(newIndex, selected);
+        //Restore Selection
+        fileListView.scrollTo(newIndex);
+        fileListView.getSelectionModel().select(newIndex);
+
+    }
+
+
+    private String classPathGenerator() throws IOException {
+
+        String classPath = "";
+
+        for (File f : fileListView.getItems()) {
+            classPath = classPath + ";" + f.getAbsolutePath();
+        }
+
+        setClassPath(classPath);
+        return classPath;
+    }
+
+
+    public void setClassPath(String classPath) throws IOException {
+
+        if (classLoader == null) {
+            classLoader = PMDConfiguration.class.getClassLoader();
+        }
+        if (classPath != null) {
+            classLoader = new ClasspathClassLoader(classPath, classLoader);
+        }
+
+        closePopup();
+    }
+
+
+    private void closePopup() {
+        Stage stage = (Stage) setClassPathButton.getScene().getWindow();
+        stage.close();
+    }
+
     public void showAuxPathWizard() throws Exception {
 
         FXMLLoader fxmlLoader = new FXMLLoader(DesignerUtil.getFxml("auxclasspath-setup-popup.fxml"));

pmd-ui/src/main/java/net/sourceforge/pmd/util/fxdesigner/MainDesignerController.java

@@ -126,7 +126,7 @@ public class MainDesignerController implements Initializable, SettingsOwner {
 
     public MainDesignerController(DesignerRoot owner) {
         this.designerRoot = owner;
-        this.auxClassPathController = new AuxClassPathController(designerRoot, this);
+        this.auxClassPathController = new AuxClassPathController(designerRoot);
     }