src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Target.java

rev 3444 : Only use IndyStringConcat for JDK >= 9

@@ -133,6 +133,12 @@
      */
     public boolean hasMethodHandles() {
         return hasInvokedynamic();
     }
 
+    /** Does the target JDK contain StringConcatFactory class?
+     */
+    public boolean hasStringConcatFactory() {
+        return compareTo(JDK1_9) >= 0;
+    }
+
 }