diff --git a/forge-core/src/main/java/forge/card/CardDb.java b/forge-core/src/main/java/forge/card/CardDb.java
index 17ada0b5f5b..a3e05f60feb 100644
--- a/forge-core/src/main/java/forge/card/CardDb.java
+++ b/forge-core/src/main/java/forge/card/CardDb.java
@@ -218,7 +218,7 @@ public final class CardDb implements ICardDatabase, IDeckGenPool {
                     CardRequest request = fromPreferredArtEntry(preferredArt, isFoil);
                     if (request != null)  // otherwise, simply discard it and go on.
                         return request;
-                    System.err.println(String.format("[LOG]: Faulty Entry in Preferred Art for Card %s - Please check!", cardName));
+                    System.err.printf("[LOG]: Faulty Entry in Preferred Art for Card %s - Please check!%n", cardName);
                 }
             }
             // finally, check whether any between artIndex and CollectorNumber has been set
diff --git a/forge-gui-desktop/src/main/java/forge/control/FControl.java b/forge-gui-desktop/src/main/java/forge/control/FControl.java
index e82a3fc7629..6ebdbb2783b 100644
--- a/forge-gui-desktop/src/main/java/forge/control/FControl.java
+++ b/forge-gui-desktop/src/main/java/forge/control/FControl.java
@@ -234,7 +234,7 @@ public enum FControl implements KeyEventDispatcher {
                 FModel.getQuest().load(QuestDataIO.loadData(data));
             } catch(IOException ex) {
                 ex.printStackTrace();
-                System.out.println(String.format("Error loading quest data (%s).. skipping for now..", questname));
+                System.err.printf("Error loading quest data (%s).. skipping for now..%n", questname);
             }
         }
 
diff --git a/forge-gui-desktop/src/main/java/forge/screens/home/quest/CSubmenuQuestLoadData.java b/forge-gui-desktop/src/main/java/forge/screens/home/quest/CSubmenuQuestLoadData.java
index 955b4c46d51..102d41bc70e 100644
--- a/forge-gui-desktop/src/main/java/forge/screens/home/quest/CSubmenuQuestLoadData.java
+++ b/forge-gui-desktop/src/main/java/forge/screens/home/quest/CSubmenuQuestLoadData.java
@@ -60,11 +60,11 @@ public enum CSubmenuQuestLoadData implements ICDoc {
         arrQuests.clear();
         for (final File f : arrFiles) {
             try {
-                System.out.println(String.format("About to load quest (%s)... ", f.getName()));
+                System.out.printf("About to load quest (%s)... %n", f.getName());
                 arrQuests.put(f.getName(), QuestDataIO.loadData(f));
             } catch(IOException ex) {
                 ex.printStackTrace();
-                System.out.println(String.format("Error loading quest data (%s).. skipping for now..", f.getName()));
+                System.err.printf("Error loading quest data (%s).. skipping for now..%n", f.getName());
                 restorableQuests.add(f.getName());
             }
         }
diff --git a/forge-gui-mobile/src/forge/Graphics.java b/forge-gui-mobile/src/forge/Graphics.java
index 8da9f8d73d3..36b1089954d 100644
--- a/forge-gui-mobile/src/forge/Graphics.java
+++ b/forge-gui-mobile/src/forge/Graphics.java
@@ -1371,7 +1371,7 @@ public class Graphics {
         Dtransforms.removeFirst();
         transformCount--;
         if (transformCount != Dtransforms.size()) {
-            System.err.println(String.format("Stack count: %d, transformCount: %d", Dtransforms.size(), transformCount));
+            System.err.printf("Stack count: %d, transformCount: %d%n", Dtransforms.size(), transformCount);
             transformCount = 0;
             Dtransforms.clear();
         }
diff --git a/forge-gui-mobile/src/forge/screens/quest/LoadQuestScreen.java b/forge-gui-mobile/src/forge/screens/quest/LoadQuestScreen.java
index c763a731236..46b7478a2ae 100644
--- a/forge-gui-mobile/src/forge/screens/quest/LoadQuestScreen.java
+++ b/forge-gui-mobile/src/forge/screens/quest/LoadQuestScreen.java
@@ -85,7 +85,7 @@ public class LoadQuestScreen extends LaunchScreen {
                 try {
                     arrQuests.put(f.getName(), QuestDataIO.loadData(f));
                 } catch (IOException e) {
-                    System.err.println(String.format("Failed to load quest '%s'", f.getName()));
+                    System.err.printf("Failed to load quest '%s'%n", f.getName());
                     // Failed to load last quest, don't continue with quest loading stuff
                     return;
                 }
diff --git a/forge-gui-mobile/src/forge/screens/quest/QuestMenu.java b/forge-gui-mobile/src/forge/screens/quest/QuestMenu.java
index 8d5a79fe466..f080d2608d3 100644
--- a/forge-gui-mobile/src/forge/screens/quest/QuestMenu.java
+++ b/forge-gui-mobile/src/forge/screens/quest/QuestMenu.java
@@ -127,7 +127,7 @@ public class QuestMenu extends FPopupMenu implements IVQuestStats {
                 try {
                     FModel.getQuest().load(QuestDataIO.loadData(data));
                 } catch (IOException e) {
-                    System.err.println(String.format("Failed to load quest '%s'", questname));
+                    System.err.printf("Failed to load quest '%s'%n", questname);
                     // Failed to load last quest, don't continue with quest loading stuff
                     return;
                 }
diff --git a/forge-gui/src/main/java/forge/gamemodes/match/input/InputSelectEntitiesFromList.java b/forge-gui/src/main/java/forge/gamemodes/match/input/InputSelectEntitiesFromList.java
index 7cfc7461889..340c43ce2b3 100644
--- a/forge-gui/src/main/java/forge/gamemodes/match/input/InputSelectEntitiesFromList.java
+++ b/forge-gui/src/main/java/forge/gamemodes/match/input/InputSelectEntitiesFromList.java
@@ -44,7 +44,7 @@ public class InputSelectEntitiesFromList<T extends GameEntity> extends InputSele
         super(controller, Math.min(min, validChoices0.size()), Math.min(max, validChoices0.size()), sa0, tallyType0, tally0);
         validChoices = validChoices0;
         if (min > validChoices.size()) { // pfps does this really do anything useful??
-            System.out.println(String.format("Trying to choose at least %d things from a list with only %d things!", min, validChoices.size()));
+            System.out.printf("Trying to choose at least %d things from a list with only %d things!%n", min, validChoices.size());
         }
         ArrayList<CardView> vCards = new ArrayList<>();
         for (T c : validChoices0) {
diff --git a/forge-gui/src/main/java/forge/gamemodes/net/CompatibleObjectDecoder.java b/forge-gui/src/main/java/forge/gamemodes/net/CompatibleObjectDecoder.java
index 2af0a82aa28..3b70145ddc8 100644
--- a/forge-gui/src/main/java/forge/gamemodes/net/CompatibleObjectDecoder.java
+++ b/forge-gui/src/main/java/forge/gamemodes/net/CompatibleObjectDecoder.java
@@ -37,7 +37,7 @@ public class CompatibleObjectDecoder extends LengthFieldBasedFrameDecoder {
         try {
             var5 = ois.readObject();
         } catch (StreamCorruptedException e) {
-            System.err.println(String.format("Version Mismatch: %s", e.getMessage()));
+            System.err.printf("Version Mismatch: %s%n", e.getMessage());
         } finally {
             ois.close();
         }
diff --git a/forge-gui/src/main/java/forge/gamemodes/net/GameProtocolHandler.java b/forge-gui/src/main/java/forge/gamemodes/net/GameProtocolHandler.java
index 8673cc5c5c6..5fd23a11af5 100644
--- a/forge-gui/src/main/java/forge/gamemodes/net/GameProtocolHandler.java
+++ b/forge-gui/src/main/java/forge/gamemodes/net/GameProtocolHandler.java
@@ -41,7 +41,7 @@ public abstract class GameProtocolHandler<T> extends ChannelInboundHandlerAdapte
             if (method == null) {
                 //throw new IllegalStateException(String.format("Method %s not found", protocolMethod.name()));
                 catchedError[0] += String.format("IllegalStateException: Method %s not found (GameProtocolHandler.java Line 43)\n", protocolMethod.name());
-                System.err.println(String.format("Method %s not found", protocolMethod.name()));
+                System.err.printf("Method %s not found%n", protocolMethod.name());
             }
 
             final Object[] args = event.getObjects();
@@ -58,7 +58,7 @@ public abstract class GameProtocolHandler<T> extends ChannelInboundHandlerAdapte
                     try {
                         method.invoke(toInvoke, args);
                     } catch (final IllegalAccessException | IllegalArgumentException e) {
-                        System.err.println(String.format("Unknown protocol method %s with %d args", methodName, args == null ? 0 : args.length));
+                        System.err.printf("Unknown protocol method %s with %d args%n", methodName, args == null ? 0 : args.length);
                     } catch (final InvocationTargetException e) {
                         //throw new RuntimeException(e.getTargetException());
                         catchedError[0] += (String.format("RuntimeException: %s (GameProtocolHandler.java Line 65)\n", e.getTargetException().toString()));
@@ -72,10 +72,10 @@ public abstract class GameProtocolHandler<T> extends ChannelInboundHandlerAdapte
                             protocolMethod.checkReturnValue(theReply);
                             reply = (Serializable) theReply;
                         } else if (theReply != null) {
-                            System.err.println(String.format("Non-serializable return type %s for method %s, returning null", returnType.getName(), methodName));
+                            System.err.printf("Non-serializable return type %s for method %s, returning null%n", returnType.getName(), methodName);
                         }
                     } catch (final IllegalAccessException | IllegalArgumentException e) {
-                        System.err.println(String.format("Unknown protocol method %s with %d args, replying with null", methodName, args == null ? 0 : args.length));
+                        System.err.printf("Unknown protocol method %s with %d args, replying with null%n", methodName, args == null ? 0 : args.length);
                     } catch (final NullPointerException | InvocationTargetException e) {
                         //throw new RuntimeException(e.getTargetException());
                         catchedError[0] += e.toString();
diff --git a/forge-gui/src/main/java/forge/gamemodes/net/ProtocolMethod.java b/forge-gui/src/main/java/forge/gamemodes/net/ProtocolMethod.java
index 805a5792517..dc768de2cd8 100644
--- a/forge-gui/src/main/java/forge/gamemodes/net/ProtocolMethod.java
+++ b/forge-gui/src/main/java/forge/gamemodes/net/ProtocolMethod.java
@@ -138,7 +138,7 @@ public enum ProtocolMethod {
             }
             return candidate;
         } catch (final NoSuchMethodException | SecurityException e) {
-            System.err.println(String.format("Warning: class contains no accessible method named %s", name()));
+            System.err.printf("Warning: class contains no accessible method named %s%n", name());
             return getMethodNoArgs();
         }
     }
@@ -147,7 +147,7 @@ public enum ProtocolMethod {
         try {
             return mode.toInvoke.getMethod(name(), (Class<?>[]) null);
         } catch (final NoSuchMethodException | SecurityException e) {
-            System.err.println(String.format("Warning: class contains no accessible arg-less method named %s", name()));
+            System.err.printf("Warning: class contains no accessible arg-less method named %s%n", name());
             return null;
         }
     }
@@ -168,7 +168,7 @@ public enum ProtocolMethod {
                 final Class<?> type = this.args[iArg];
                 if (!ReflectionUtil.isInstance(arg, type)) {
                     //throw new InternalError(String.format("Protocol method %s: illegal argument (%d) of type %s, %s expected", name(), iArg, arg.getClass().getName(), type.getName()));
-                    System.err.println(String.format("InternalError: Protocol method %s: illegal argument (%d) of type %s, %s expected (ProtocolMethod.java)", name(), iArg, arg.getClass().getName(), type.getName()));
+                    System.err.printf("InternalError: Protocol method %s: illegal argument (%d) of type %s, %s expected (ProtocolMethod.java)%n", name(), iArg, arg.getClass().getName(), type.getName());
                 }
             }
         } catch (Exception e) {
@@ -183,7 +183,7 @@ public enum ProtocolMethod {
         }
         if (!ReflectionUtil.isInstance(value, returnType)) {
             //throw new IllegalStateException(String.format("Protocol method %s: illegal return object type %s returned by client, expected %s", name(), value.getClass().getName(), getReturnType().getName()));
-            System.err.println(String.format("IllegalStateException: Protocol method %s: illegal return object type %s returned by client, expected %s  (ProtocolMethod.java)", name(), value.getClass().getName(), getReturnType().getName()));
+            System.err.printf("IllegalStateException: Protocol method %s: illegal return object type %s returned by client, expected %s  (ProtocolMethod.java)%n", name(), value.getClass().getName(), getReturnType().getName());
         }
     }
 }
diff --git a/forge-gui/src/main/java/forge/gui/download/GuiDownloadService.java b/forge-gui/src/main/java/forge/gui/download/GuiDownloadService.java
index 1ae2637f4c0..8f82b609ccc 100644
--- a/forge-gui/src/main/java/forge/gui/download/GuiDownloadService.java
+++ b/forge-gui/src/main/java/forge/gui/download/GuiDownloadService.java
@@ -338,7 +338,7 @@ public abstract class GuiDownloadService implements Runnable {
             }
             catch (final FileNotFoundException fnfe) {
                 String formatStr = "  Error - the LQ picture %s could not be found on the server. [%s] - %s";
-                System.out.println(String.format(formatStr, fileDest.getName(), url, fnfe.getMessage()));
+                System.out.printf((formatStr) + "%n", fileDest.getName(), url, fnfe.getMessage());
             }
             catch (final Exception ex) {
                 Log.error("LQ Pictures", "Error downloading pictures", ex);