make the mod 1.12 compatible

build.gradle

@@ -4,32 +4,32 @@ buildscript {
         maven { url = "http://files.minecraftforge.net/maven" }
     }
     dependencies {
-        classpath 'net.minecraftforge.gradle:ForgeGradle:2.2-SNAPSHOT'
+        classpath 'net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT'
     }
 }
 apply plugin: 'net.minecraftforge.gradle.forge'
 //Only edit below this line, the above code adds and enables the necessary things for Forge to be setup.
 
 
-version = "1.1.0"
+version = "1.12-1.1.0"
 group = "de.guntram.mcmod.easiervillagertrading" // http://maven.apache.org/guides/mini/guide-naming-conventions.html
 archivesBaseName = "easiervillagertrading"
 
-sourceCompatibility = targetCompatibility = "1.6" // Need this here so eclipse task generates correctly.
+sourceCompatibility = targetCompatibility = "1.8" // Need this here so eclipse task generates correctly.
 compileJava {
-    sourceCompatibility = targetCompatibility = "1.6"
+    sourceCompatibility = targetCompatibility = "1.8"
 }
 
 minecraft {
-    version = "1.11.2-13.20.0.2231"
+    version = "1.12-14.21.0.2335"
     runDir = "run"
 
     // the mappings can be changed at any time, and must be in the following format.
     // snapshot_YYYYMMDD   snapshot are built nightly.
     // stable_#            stables are built at the discretion of the MCP team.
     // Use non-default mappings at your own risk. they may not always work.
     // simply re-run your setup task after changing the mappings to update your workspace.
-    mappings = "snapshot_20170222"
+    mappings = "snapshot_20170618"
     // makeObfSourceJar = false // an Srg named sources jar is made by default. uncomment this to disable.
 }
 

src/main/java/de/guntram/mcmod/easiervillagertrading/EasierVillagerTrading.java

@@ -11,7 +11,7 @@
         version = EasierVillagerTrading.VERSION,
 	clientSideOnly = true, 
 	guiFactory = "de.guntram.mcmod.easiervillagertrading.GuiFactory",
-	acceptedMinecraftVersions = "[1.11.2]",
+	acceptedMinecraftVersions = "[1.12]",
         dependencies = "after:jei"
 )
 

src/main/java/de/guntram/mcmod/easiervillagertrading/GuiFactory.java

@@ -6,6 +6,12 @@
 import net.minecraftforge.fml.client.IModGuiFactory;
 
 public class GuiFactory implements IModGuiFactory {
+
+    @Override
+    public boolean hasConfigGui() {
+        return true;
+    }
+
     @Override
     public void initialize(final Minecraft minecraftInstance) {
     }
@@ -15,6 +21,11 @@ public Class<? extends GuiScreen> mainConfigGuiClass() {
         return de.guntram.mcmod.easiervillagertrading.GuiConfig.class;
     }
 
+    @Override
+    public GuiScreen createConfigGui(GuiScreen parentScreen) {
+        return new GuiConfig(parentScreen);
+    }
+
     @Override
     public Set<IModGuiFactory.RuntimeOptionCategoryElement> runtimeGuiCategories() {
         return null;