From 2b878f863c2124faa1e6582e01b9366590ed05f9 Mon Sep 17 00:00:00 2001
From: Alexander Udalov <Alexander.Udalov@jetbrains.com>
Date: Thu, 1 Jun 2017 00:49:46 +0300
Subject: [PATCH] CLI: report error if kotlinc is invoked on Java 6 or 7

 #KT-17297 Fixed
---
 .../src/org/jetbrains/kotlin/preloading/Preloader.java     | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/compiler/preloader/src/org/jetbrains/kotlin/preloading/Preloader.java b/compiler/preloader/src/org/jetbrains/kotlin/preloading/Preloader.java
index 901d3c89472..4b3baf9f834 100644
--- a/compiler/preloader/src/org/jetbrains/kotlin/preloading/Preloader.java
+++ b/compiler/preloader/src/org/jetbrains/kotlin/preloading/Preloader.java
@@ -32,6 +32,13 @@ public class Preloader {
     public static final int DEFAULT_CLASS_NUMBER_ESTIMATE = 4096;
 
     public static void main(String[] args) throws Exception {
+        String javaVersion = System.getProperty("java.specification.version");
+        if (javaVersion.equals("1.6") || javaVersion.equals("1.7")) {
+            System.err.println("error: running the Kotlin compiler under Java " + javaVersion + " is not supported. " +
+                               "Java 1.8 or later is required");
+            System.exit(1);
+        }
+
         try {
             run(args);
         }