diff --git a/arduino-core/src/processing/app/debug/LegacyTargetBoard.java b/arduino-core/src/processing/app/debug/LegacyTargetBoard.java
index 9481e48b9..16770a635 100644
--- a/arduino-core/src/processing/app/debug/LegacyTargetBoard.java
+++ b/arduino-core/src/processing/app/debug/LegacyTargetBoard.java
@@ -20,27 +20,21 @@
  */
 package processing.app.debug;
 
-import static processing.app.I18n.tr;
-import static processing.app.I18n.format;
+import processing.app.helpers.PreferencesMap;
 
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
 
-import processing.app.helpers.PreferencesMap;
-
 public class LegacyTargetBoard implements TargetBoard {
 
-  private String id;
-  private PreferencesMap prefs;
-  private Map<String, PreferencesMap> menuOptions = new LinkedHashMap<String, PreferencesMap>();
-  private TargetPlatform containerPlatform;
+  private final String id;
+  private final PreferencesMap prefs;
+  private Map<String, PreferencesMap> menuOptions = new LinkedHashMap<>();
+  private final TargetPlatform containerPlatform;
 
   /**
    * Create a TargetBoard based on preferences passed as argument.
-   * 
-   * @param _prefs
-   * @return
    */
   public LegacyTargetBoard(String _id, PreferencesMap _prefs,
                            TargetPlatform parent) {
@@ -58,10 +52,6 @@ public class LegacyTargetBoard implements TargetBoard {
       String board = containerPlatform.getId() + "_" + id;
       board = board.toUpperCase();
       prefs.put("build.board", board);
-      System.err
-          .println(format(tr("Board {0}:{1}:{2} doesn''t define a ''build.board'' preference. Auto-set to: {3}"),
-                          containerPlatform.getContainerPackage().getId(),
-                          containerPlatform.getId(), id, board));
     }
   }
 
diff --git a/arduino-core/src/processing/app/debug/LegacyTargetPlatform.java b/arduino-core/src/processing/app/debug/LegacyTargetPlatform.java
index 036860832..65e4d4fdc 100644
--- a/arduino-core/src/processing/app/debug/LegacyTargetPlatform.java
+++ b/arduino-core/src/processing/app/debug/LegacyTargetPlatform.java
@@ -21,7 +21,6 @@
 package processing.app.debug;
 
 import processing.app.BaseNoGui;
-import processing.app.I18n;
 import processing.app.helpers.PreferencesMap;
 
 import java.io.File;
@@ -30,24 +29,24 @@ import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
 
-import static processing.app.I18n.tr;
 import static processing.app.I18n.format;
+import static processing.app.I18n.tr;
 
 public class LegacyTargetPlatform implements TargetPlatform {
 
-  private String id;
-  private File folder;
+  private final String id;
+  private final File folder;
 
-  private TargetPackage containerPackage;
-  protected PreferencesMap preferences = new PreferencesMap();
+  private final TargetPackage containerPackage;
+  private final PreferencesMap preferences = new PreferencesMap();
 
-  private Map<String, TargetBoard> boards = new LinkedHashMap<String, TargetBoard>();
+  private final Map<String, TargetBoard> boards = new LinkedHashMap<>();
   private TargetBoard defaultBoard;
 
   /**
    * Contains preferences for every defined programmer
    */
-  private Map<String, PreferencesMap> programmers = new LinkedHashMap<String, PreferencesMap>();
+  private Map<String, PreferencesMap> programmers = new LinkedHashMap<>();
 
   /**
    * Contains labels for top level menus
@@ -162,15 +161,9 @@ public class LegacyTargetPlatform implements TargetPlatform {
     PreferencesMap oldProps = platformRewriteProps.subTree("old");
     PreferencesMap newProps = platformRewriteProps.subTree("new");
 
-    String platformName = preferences.get("name");
-    if (platformName == null) {
-      platformName = folder.getAbsolutePath();
-    }
-
     for (Map.Entry<String, String> entry : oldProps.entrySet()) {
       String preferencesKey = entry.getKey().substring(entry.getKey().indexOf(".") + 1);
       if (preferences.containsKey(preferencesKey) && entry.getValue().equals(preferences.get(preferencesKey))) {
-        System.err.println(I18n.format(tr("Warning: platform.txt from core '{0}' contains deprecated {1}, automatically converted to {2}. Consider upgrading this core."), platformName, preferencesKey + "=" + entry.getValue(), preferencesKey + "=" + newProps.get(entry.getKey())));
         preferences.put(preferencesKey, newProps.get(entry.getKey()));
       }
     }
@@ -182,7 +175,6 @@ public class LegacyTargetPlatform implements TargetPlatform {
       String keyToAddFirstLevel = keyToAddParts[0];
       String keyToAddSecondLevel = keyToAddParts[0] + "." + keyToAddParts[1];
       if (!preferences.subTree(keyToAddFirstLevel).isEmpty() && !preferences.subTree(keyToAddSecondLevel).isEmpty() && !preferences.containsKey(keyToAdd)) {
-        System.err.println(I18n.format(tr("Warning: platform.txt from core '{0}' misses property {1}, automatically set to {2}. Consider upgrading this core."), platformName, keyToAdd, entry.getValue()));
         preferences.put(keyToAdd, entry.getValue());
       }
     }
diff --git a/arduino-core/src/processing/app/packages/UserLibrary.java b/arduino-core/src/processing/app/packages/UserLibrary.java
index 10d5d64e6..c621a6e17 100644
--- a/arduino-core/src/processing/app/packages/UserLibrary.java
+++ b/arduino-core/src/processing/app/packages/UserLibrary.java
@@ -31,7 +31,6 @@ package processing.app.packages;
 import cc.arduino.Constants;
 import cc.arduino.contributions.libraries.ContributedLibrary;
 import cc.arduino.contributions.libraries.ContributedLibraryReference;
-import processing.app.helpers.FileUtils;
 import processing.app.helpers.PreferencesMap;
 
 import java.io.File;
@@ -91,11 +90,6 @@ public class UserLibrary extends ContributedLibrary {
     if (srcFolder.exists() && srcFolder.isDirectory()) {
       // Layout with a single "src" folder and recursive compilation
       layout = LibraryLayout.RECURSIVE;
-
-      File utilFolder = new File(libFolder, "utility");
-      if (utilFolder.exists() && utilFolder.isDirectory()) {
-        throw new IOException("Library can't use both 'src' and 'utility' folders.");
-      }
     } else {
       // Layout with source code on library's root and "utility" folders
       layout = LibraryLayout.FLAT;
@@ -106,13 +100,6 @@ public class UserLibrary extends ContributedLibrary {
     if (files == null) {
       throw new IOException("Unable to list files of library in " + libFolder);
     }
-    for (File file : files) {
-      if (file.isDirectory() && FileUtils.isSCCSOrHiddenFile(file)) {
-        if (!FileUtils.isSCCSFolder(file) && FileUtils.isHiddenFile(file)) {
-          System.out.println("WARNING: Spurious " + file.getName() + " folder in '" + properties.get("name") + "' library");
-        }
-      }
-    }
 
     // Extract metadata info
     String architectures = properties.get("architectures");
@@ -123,10 +110,10 @@ public class UserLibrary extends ContributedLibrary {
       archs.add(arch.trim());
 
     String category = properties.get("category");
-    if (category == null)
+    if (category == null) {
       category = "Uncategorized";
+    }
     if (!Constants.LIBRARY_CATEGORIES.contains(category)) {
-      System.out.println("WARNING: Category '" + category + "' in library " + properties.get("name") + " is not valid. Setting to 'Uncategorized'");
       category = "Uncategorized";
     }