src/jdk.compiler/share/classes/com/sun/tools/javac/code/Source.java

@@ -77,11 +77,14 @@
 
     /** 1.9 modularity. */
     JDK9("9"),
 
     /** 1.10 covers the to be determined language features that will be added in JDK 10. */
-    JDK10("10");
+    JDK10("10"),
+
+    /** 1.11 covers the to be determined language features that will be added in JDK 11. */
+    JDK11("11");
 
     private static final Context.Key<Source> sourceKey = new Context.Key<>();
 
     public static Source instance(Context context) {
         Source instance = context.get(sourceKey);

@@ -106,10 +109,11 @@
         tab.put("1.6", JDK6); // Make 6 an alias for 1.6
         tab.put("1.7", JDK7); // Make 7 an alias for 1.7
         tab.put("1.8", JDK8); // Make 8 an alias for 1.8
         tab.put("1.9", JDK9); // Make 9 an alias for 1.9
         tab.put("1.10", JDK10); // Make 10 an alias for 1.10
+        // Decline to make 1.11 an alias for 11.
     }
 
     private Source(String name) {
         this.name = name;
     }

@@ -123,10 +127,11 @@
     public static Source lookup(String name) {
         return tab.get(name);
     }
 
     public Target requiredTarget() {
+        if (this.compareTo(JDK11) >= 0) return Target.JDK1_11;
         if (this.compareTo(JDK10) >= 0) return Target.JDK1_10;
         if (this.compareTo(JDK9) >= 0) return Target.JDK1_9;
         if (this.compareTo(JDK8) >= 0) return Target.JDK1_8;
         if (this.compareTo(JDK7) >= 0) return Target.JDK1_7;
         if (this.compareTo(JDK6) >= 0) return Target.JDK1_6;

@@ -245,10 +250,12 @@
             return RELEASE_8;
         case JDK9:
             return RELEASE_9;
         case JDK10:
             return RELEASE_10;
+        case JDK11:
+            return RELEASE_11;
         default:
             return null;
         }
     }
 }