Fix J13 ambiguous reference and JenkinsFile skipping a step.

Jenkinsfile

@@ -18,11 +18,13 @@ pipeline {
     }
 
     stages {
+        /* This resets the checkout on jenkins, but doesn't take branch into account... 
         stage('fetch') {
             steps {
                 checkout scm
             }
         }
+        */
         stage('notify_start') {
             when {
                 not {
@@ -49,6 +51,14 @@ pipeline {
                 }
             }
         }
+        stage('setup') {
+            steps {
+                sh './gradlew ${GRADLE_ARGS} --refresh-dependencies --continue setup'
+                script {
+                    env.MYVERSION = sh(returnStdout: true, script: './gradlew :forge:properties -q | grep "version:" | awk \'{print $2}\'').trim()
+                }
+            }
+        }
         stage('changelog') {
             when {
                 not {

src/main/java/net/minecraftforge/common/crafting/CraftingHelper.java

@@ -654,7 +654,7 @@ public class CraftingHelper {
 
             if (mod.getSource().isFile())
             {
-                fs = FileSystems.newFileSystem(mod.getSource().toPath(), null);
+                fs = FileSystems.newFileSystem(mod.getSource().toPath(), (ClassLoader)null);
                 fPath = fs.getPath("/" + base, "_factories.json");
             }
             else if (mod.getSource().isDirectory())
@@ -791,7 +791,7 @@ public class CraftingHelper {
             {
                 try
                 {
-                    fs = FileSystems.newFileSystem(source.toPath(), null);
+                    fs = FileSystems.newFileSystem(source.toPath(), (ClassLoader)null);
                     root = fs.getPath("/" + base);
                 }
                 catch (IOException e)
@@ -885,7 +885,7 @@ public class CraftingHelper {
         Path fPath = null;
         if(mod.getSource().isFile())
         {
-            try(FileSystem fs = FileSystems.newFileSystem(mod.getSource().toPath(), null))
+            try(FileSystem fs = FileSystems.newFileSystem(mod.getSource().toPath(), (ClassLoader)null))
             {
                 fPath = fs.getPath("assets", path.getResourceDomain(), path.getResourcePath());
             }