Tree.java

public void mouseClicked(MouseEvent mouseEvent) {
        FilePathTreeItem item = (FilePathTreeItem) treeView.getSelectionModel().getSelectedItem();
        System.out.println(item.getAbsolutePath());
        showItems(item);
}


public class FilePathTreeItem extends TreeItem<String>{
  private final File file;
   @Override
    public ObservableList<TreeItem<String>> getChildren(){
        //System.out.println("Getting Children for "+file.toString());
        if(isFirstTimeChildren){
            isFirstTimeChildren=false;
            super.getChildren().setAll(buildChildren(this));
        }
        return(super.getChildren());
    }
}