PR: MNG-374

don't let the original plugin configuration get polluted during goal attainment

git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@169485 13f79535-47bb-0310-9956-ffa450edef68

maven-project/src/main/java/org/apache/maven/project/MavenProject.java

@@ -847,6 +847,13 @@ public class MavenProject
                 }
             }
         }
+
+        if ( dom != null )
+        {
+            // make a copy so the original in the POM doesn't get messed with
+            dom = new Xpp3Dom( dom );
+        }
+
         return dom;
     }