From b765ef344a970e3e12974cf161fe31bee60ce8ca Mon Sep 17 00:00:00 2001
From: Jan Lahoda <jlahoda@openjdk.org>
Date: Tue, 11 Oct 2016 12:33:15 +0200
Subject: [PATCH] 8166890: JShell: locks forever when input is piped

Only read cursor position if connected to a terminal.

Reviewed-by: rfield, shinyafox
---
 .../share/classes/jdk/internal/jline/console/ConsoleReader.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jdk/src/jdk.internal.le/share/classes/jdk/internal/jline/console/ConsoleReader.java b/jdk/src/jdk.internal.le/share/classes/jdk/internal/jline/console/ConsoleReader.java
index 84341e1e181..999b0f7bd91 100644
--- a/jdk/src/jdk.internal.le/share/classes/jdk/internal/jline/console/ConsoleReader.java
+++ b/jdk/src/jdk.internal.le/share/classes/jdk/internal/jline/console/ConsoleReader.java
@@ -2339,7 +2339,7 @@ public class ConsoleReader
 
             Stack<Character> pushBackChar = new Stack<Character>();
 
-            if (terminal.isAnsiSupported()) {
+            if (terminal.isAnsiSupported() && System.console() != null) {
                 //detect the prompt length by reading the cursor position from the terminal
                 //the real prompt length could differ from the simple prompt length due to
                 //use of escape sequences: