Amount must be greater than 0

src/main/java/de/epiceric/shopchest/ShopCommand.java

@@ -264,6 +264,11 @@ class ShopCommand extends BukkitCommand {
             return;
         }
 
+        if (amount <= 0) {
+            p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.AMOUNT_IS_ZERO));
+            return;
+        }
+
         plugin.debug(p.getName() + " has entered numbers as prices and amount");
 
         if (!plugin.getShopChestConfig().allow_decimals_in_price && (buyPrice != (int) buyPrice || sellPrice != (int) sellPrice)) {

src/main/java/de/epiceric/shopchest/language/LanguageUtils.java

@@ -879,6 +879,7 @@ public class LanguageUtils {
         messages.add(new LocalizedMessage(LocalizedMessage.Message.OUT_OF_STOCK, langConfig.getString("message.out-of-stock", "&cShop out of stock.")));
         messages.add(new LocalizedMessage(LocalizedMessage.Message.ERROR_OCCURRED, langConfig.getString("message.error-occurred", "&cAn error occurred: %ERROR%"), Regex.ERROR));
         messages.add(new LocalizedMessage(LocalizedMessage.Message.AMOUNT_PRICE_NOT_NUMBER, langConfig.getString("message.amount-and-price-not-number", "&cAmount and price must be a number.")));
+        messages.add(new LocalizedMessage(LocalizedMessage.Message.AMOUNT_IS_ZERO, langConfig.getString("message.amount-is-zero", "&cAmount must be greater than 0.")));
         messages.add(new LocalizedMessage(LocalizedMessage.Message.PRICES_CONTAIN_DECIMALS, langConfig.getString("message.prices-contain-decimals", "&cPrices must not contain decimals.")));
         messages.add(new LocalizedMessage(LocalizedMessage.Message.NO_ITEM_IN_HAND, langConfig.getString("message.no-item-in-hand", "&cNo item in hand")));
         messages.add(new LocalizedMessage(LocalizedMessage.Message.CLICK_CHEST_CREATE, langConfig.getString("message.click-chest-to-create-shop", "&aClick a chest to create a shop.")));

src/main/java/de/epiceric/shopchest/language/LocalizedMessage.java

@@ -76,6 +76,7 @@ public class LocalizedMessage {
         OUT_OF_STOCK,
         ERROR_OCCURRED,
         AMOUNT_PRICE_NOT_NUMBER,
+        AMOUNT_IS_ZERO,
         PRICES_CONTAIN_DECIMALS,
         NO_ITEM_IN_HAND,
         CLICK_CHEST_CREATE,

src/main/resources/lang/de_DE.lang

@@ -32,6 +32,7 @@ message.vendor-not-enough-money=&cVerkäufer hat nicht genug Geld.
 message.out-of-stock=&cShop ausverkauft.
 message.error-occurred=&cEin Fehler ist aufgetreten: %ERROR%
 message.amount-and-price-not-number=&cAnzahl und Preise müssen Zahlen sein.
+message.amount-is-zero=&cAnzahl muss größer als 0 sein.
 message.prices-contain-decimals=&cPreise dürfen keine Dezimalen enthalten.
 message.no-item-in-hand=&cKein Item in der Hand.
 message.click-chest-to-create-shop=&aKlicke auf eine Truhe, um einen Shop zu erstellen.

src/main/resources/lang/en_US.lang

@@ -118,6 +118,9 @@ message.error-occurred=&cAn error occurred: %ERROR%
 # Set the message when the arguments <AMOUNT>, <BUY-PRICE> and/or <SELL-PRICE> of '/shop create' are not a number.
 message.amount-and-price-not-number=&cAmount and prices must be numbers.
 
+# Set the message when the argument <AMOUNT> is zero
+message.amount-is-zero=&cAmount must be greater than 0.
+
 # Set the message when the config value "allow-decimals-in-prices" is set to false
 # and a player enters a price with decimals
 message.prices-contain-decimals=&cPrices must not contain decimals.