--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Target.java	2016-01-15 13:30:55.907357761 +0300
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Target.java	2016-01-15 13:30:55.787358364 +0300
@@ -135,4 +135,10 @@
         return hasInvokedynamic();
     }
 
+    /** Does the target JDK contain StringConcatFactory class?
+     */
+    public boolean hasStringConcatFactory() {
+        return compareTo(JDK1_9) >= 0;
+    }
+
 }