Exposed a new method to create a TopLevelItem under arbitrary ItemGroup.

core/src/main/java/hudson/matrix/MatrixProject.java

@@ -653,8 +653,8 @@ public class MatrixProject extends AbstractProject<MatrixProject,MatrixBuild> im
             return Messages.MatrixProject_DisplayName();
         }
 
-        public MatrixProject newInstance(String name) {
-            return new MatrixProject(name);
+        public MatrixProject newInstance(ItemGroup parent, String name) {
+            return new MatrixProject(parent,name);
         }
 
         /**

core/src/main/java/hudson/model/ExternalJob.java

@@ -118,8 +118,8 @@ public class ExternalJob extends ViewJob<ExternalJob,ExternalRun> implements Top
             return Messages.ExternalJob_DisplayName();
         }
 
-        public ExternalJob newInstance(String name) {
-            return new ExternalJob(name);
+        public ExternalJob newInstance(ItemGroup parent, String name) {
+            return new ExternalJob(parent,name);
         }
     }
 }

core/src/main/java/hudson/model/FreeStyleProject.java

@@ -111,8 +111,8 @@ public class FreeStyleProject extends Project<FreeStyleProject,FreeStyleBuild> i
             return Messages.FreeStyleProject_DisplayName();
         }
 
-        public FreeStyleProject newInstance(String name) {
-            return new FreeStyleProject(Hudson.getInstance(),name);
+        public FreeStyleProject newInstance(ItemGroup parent, String name) {
+            return new FreeStyleProject(parent,name);
         }
     }
 }

core/src/main/java/hudson/model/TopLevelItemDescriptor.java

@@ -81,9 +81,21 @@ public abstract class TopLevelItemDescriptor extends Descriptor<TopLevelItem> {
     }
 
     /**
-     * Creates a new {@link Job}.
+     * Creates a new {@link TopLevelItem}.
+     *
+     * @deprecated as of 1.390
+     *      Use {@link #newInstance(ItemGroup, String)}
+     */
+    public TopLevelItem newInstance(String name) {
+        return newInstance(Hudson.getInstance(), name);
+    }
+
+    /**
+     * Creates a new {@link TopLevelItem} for the specified parent.
+     *
+     * @since 1.390
      */
-    public abstract TopLevelItem newInstance(String name);
+    public abstract TopLevelItem newInstance(ItemGroup parent, String name);
 
     /**
      * Returns all the registered {@link TopLevelItem} descriptors.

maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java

@@ -902,8 +902,8 @@ public final class MavenModuleSet extends AbstractMavenProject<MavenModuleSet,Ma
             return Messages.MavenModuleSet_DiplayName();
         }
 
-        public MavenModuleSet newInstance(String name) {
-            return new MavenModuleSet(name);
+        public MavenModuleSet newInstance(ItemGroup parent, String name) {
+            return new MavenModuleSet(parent,name);
         }
 
         public Maven.DescriptorImpl getMavenDescriptor() {