Put API and implementation in seperate modules

api/pom.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>de.epiceric.shopchest</groupId>
+    <artifactId>shopchest-api</artifactId>
+    <version>1.13-SNAPSHOT</version>
+
+    <name>ShopChest-API</name>
+
+    <parent>
+        <groupId>de.epiceric.shopchest</groupId>
+        <artifactId>shopchest-parent</artifactId>
+        <version>1.13-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>3.1.1</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

api/src/main/java/de/epiceric/shopchest/api/ShopChest.java

@@ -1,20 +1,21 @@
 package de.epiceric.shopchest.api;
 
 import org.bukkit.OfflinePlayer;
+import org.bukkit.plugin.java.JavaPlugin;
 
 /**
  * The plugin's main entry point
  * 
  * @since 1.13
  */
-public interface ShopChest {
-
+public abstract class ShopChest extends JavaPlugin {
+    
     /**
      * Gets an instance of the shop manager
      * 
      * @return the shop manager
      */
-    ShopManager getShopManager();
+    public abstract ShopManager getShopManager();
 
     /**
      * Gets the amount of shops the given player is allowed to have
@@ -24,6 +25,6 @@ public interface ShopChest {
      * @param player the player
      * @return the shop limit
      */
-    int getShopLimit(OfflinePlayer player);
+    public abstract int getShopLimit(OfflinePlayer player);
     
 }

api/src/main/java/de/epiceric/shopchest/api/event/ShopRemoveAllEvent.java

@@ -1,6 +1,6 @@
 package de.epiceric.shopchest.api.event;
 
-import de.epiceric.shopchest.shop.Shop;
+import de.epiceric.shopchest.api.shop.Shop;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.command.CommandSender;
 import org.bukkit.event.Cancellable;

implementation/pom.xml

@@ -0,0 +1,181 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>de.epiceric.shopchest</groupId>
+    <artifactId>shopchest</artifactId>
+    <version>1.13-SNAPSHOT</version>
+
+    <name>ShopChest</name>
+    <url>https://www.spigotmc.org/resources/shopchest.11431/</url>
+    <description>Let your players create their own nice-looking shops to sell their stuff to other players!</description>
+
+    <parent>
+        <groupId>de.epiceric.shopchest</groupId>
+        <artifactId>shopchest-parent</artifactId>
+        <version>1.13-SNAPSHOT</version>
+    </parent>
+
+    <repositories>
+        <repository>
+            <id>vault-repo</id>
+            <url>http://nexus.hc.to/content/repositories/pub_releases/</url>
+        </repository>
+        <repository>
+            <id>codemc-repo</id>
+            <url>https://repo.codemc.org/repository/maven-public/</url>
+        </repository>
+        <repository>
+            <id>sk89q-repo</id>
+            <url>http://maven.sk89q.com/artifactory/repo/</url>
+        </repository>
+        <repository>
+            <id>athion-repo</id>
+            <url>http://ci.athion.net/job/PlotSquared-Releases/ws/mvn/</url>
+        </repository>
+        <repository>
+            <id>uskyblock-repo</id>
+            <url>https://raw.github.com/rlf/uSkyBlock/mvn-repo/</url>
+        </repository>
+        <repository>
+            <id>tastybento-repo</id>
+            <url>http://dl.bintray.com/tastybento/maven-repo</url>
+        </repository>
+        <repository>
+            <id>jitpack-repo</id>
+            <url>https://jitpack.io</url>
+        </repository>
+        <repository>
+            <id>nlthijs48-repo</id>
+            <url>http://maven.wiefferink.me</url>
+        </repository>
+    </repositories>
+
+    <dependencies>
+        <dependency>
+            <groupId>net.milkbowl.vault</groupId>
+            <artifactId>VaultAPI</artifactId>
+            <version>1.7</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>fr.xephi</groupId>
+            <artifactId>authme</artifactId>
+            <version>5.4.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.intellectualsites.plotsquared</groupId>
+            <artifactId>PlotSquared-API</artifactId>
+            <version>4.226</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.rlf</groupId>
+            <artifactId>uSkyBlock-API</artifactId>
+            <version>2.6.4</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.wasteofplastic</groupId>
+            <artifactId>askyblock</artifactId>
+            <version>3.0.6.2</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.TechFortress</groupId>
+            <artifactId>GriefPrevention</artifactId>
+            <version>16.11.6</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>me.wiefferink</groupId>
+            <artifactId>areashop</artifactId>
+            <version>2.6.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.palmergames</groupId>
+            <artifactId>Towny</artifactId>
+            <version>0.93.1.0</version>
+            <scope>system</scope>
+            <systemPath>${project.basedir}/lib/Towny-0.93.1.0.jar</systemPath>
+        </dependency>
+        <dependency>
+            <groupId>pl.gnacik</groupId>
+            <artifactId>IslandWorld</artifactId>
+            <version>8.5</version>
+            <scope>system</scope>
+            <systemPath>${project.basedir}/lib/IslandWorld-8.5.jar</systemPath>
+        </dependency>
+        
+        <!-- Shaded dependencies -->
+        <dependency>
+            <groupId>de.epiceric.shopchest</groupId>
+            <artifactId>shopchest-api</artifactId>
+            <version>1.13-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codemc.worldguardwrapper</groupId>
+            <artifactId>worldguardwrapper</artifactId>
+            <version>1.1.6-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>org.bstats</groupId>
+            <artifactId>bstats-bukkit</artifactId>
+            <version>1.5</version>
+        </dependency>
+        <dependency>
+            <groupId>com.zaxxer</groupId>
+            <artifactId>HikariCP</artifactId>
+            <version>3.3.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-jdk14</artifactId>
+            <version>1.7.26</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.1.1</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <createDependencyReducedPom>false</createDependencyReducedPom>
+                    <relocations>
+                        <relocation>
+                            <pattern>org.bstats.bukkit</pattern>
+                            <shadedPattern>de.epiceric.shopchest.dependencies.bstats</shadedPattern>
+                        </relocation>
+                        <relocation>
+                            <pattern>org.codemc.worldguardwrapper</pattern>
+                            <shadedPattern>de.epiceric.shopchest.dependencies.worldguardwrapper</shadedPattern>
+                        </relocation>
+                        <relocation>
+                            <pattern>com.zaxxer.hikari</pattern>
+                            <shadedPattern>de.epiceric.shopchest.dependencies.hikari</shadedPattern>
+                        </relocation>
+                        <relocation>
+                            <pattern>org.slf4j</pattern>
+                            <shadedPattern>de.epiceric.shopchest.dependencies.slf4j</shadedPattern>
+                        </relocation>
+                    </relocations>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

implementation/src/main/java/de/epiceric/shopchest/command/ShopCommandExecutor.java

@@ -150,7 +150,7 @@ class ShopCommandExecutor implements CommandExecutor {
 
         sender.sendMessage(LanguageUtils.getMessage(Message.UPDATE_CHECKING));
 
-        UpdateChecker uc = new UpdateChecker(ShopChest.getInstance());
+        UpdateChecker uc = new UpdateChecker(plugin);
         UpdateChecker.UpdateCheckerResult result = uc.check();
 
         if (result == UpdateChecker.UpdateCheckerResult.TRUE) {

implementation/src/main/java/de/epiceric/shopchest/external/PlotSquaredShopFlag.java

@@ -43,7 +43,7 @@ public class PlotSquaredShopFlag {
     public static boolean isFlagAllowedOnPlot(Plot plot, GroupFlag flag, Player p) {
         if (plot != null && flag != null) {
             Group group = plot.getFlag(flag, PlotSquaredShopFlag.Group.NONE);
-            ShopChest.getInstance().debug("Flag " + flag.getName() + " is set to " + group);
+            //ShopChest.getInstance().debug("Flag " + flag.getName() + " is set to " + group);
 
             switch (group) {
                 case OWNERS:
@@ -59,7 +59,7 @@ public class PlotSquaredShopFlag {
             }
         }
 
-        ShopChest.getInstance().debug("Flag or plot is null, or value of flag is not a group");
+        //ShopChest.getInstance().debug("Flag or plot is null, or value of flag is not a group");
 
         return true;
     }