471362 Fix basic Java 9 support

Signed-off-by: Fred Bricon <fbricon@gmail.com>
diff --git a/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java b/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java
index cbbf0c1..c43bd0f 100644
--- a/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java
+++ b/org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java
@@ -548,11 +548,13 @@
 
   private String sanitizeJavaVersion(String version) {
     switch(version) {
+      case "1.9":
+        version = version.substring(2);
+        break;
       case "5":
       case "6":
       case "7":
       case "8":
-      case "9":
         version = "1." + version;
         break;
       default: