[java] correct Java version in .class file editor notification (IDEA-156371)

java/idea-ui/src/com/intellij/codeInsight/daemon/impl/AttachSourcesNotificationProvider.java

@@ -175,7 +175,9 @@ public class AttachSourcesNotificationProvider extends EditorNotifications.Provi
             int major = stream.readUnsignedShort();
             StringBuilder info = new StringBuilder().append("bytecode version: ").append(major).append('.').append(minor);
             LanguageLevel level = ClsParsingUtil.getLanguageLevelByVersion(major);
-            if (level != null) info.append(" (").append(level.getName()).append(')');
+            if (level != null) {
+              info.append(" (").append(level == LanguageLevel.JDK_1_3 ? level.getName() + " or older" : level.getName()).append(')');
+            }
             return info.toString();
           }
         }

java/java-psi-impl/src/com/intellij/psi/impl/compiled/ClsParsingUtil.java

@@ -200,6 +200,9 @@ public class ClsParsingUtil {
       case Opcodes.V1_8:
         return LanguageLevel.JDK_1_8;
 
+      case Opcodes.V1_8 + 1:
+        return LanguageLevel.JDK_1_9;
+
       default:
         return null;
     }