From 921a5d1aa8898c8c6f0e75abe8d8e43b95d7062b Mon Sep 17 00:00:00 2001
From: Sean Gilligan <sean@msgilligan.com>
Date: Tue, 2 Jul 2019 21:08:27 -0700
Subject: [PATCH] Fix NPE in o.b.c.Utils runtime and os detection
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If getProperty returns null calling toLowerCase results in NPE. Instead
we’ll use a default value and check for .equals(“”) in the following if.
---
 core/src/main/java/org/bitcoinj/core/Utils.java | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/core/src/main/java/org/bitcoinj/core/Utils.java b/core/src/main/java/org/bitcoinj/core/Utils.java
index 7dfab6f8..a28c4e66 100644
--- a/core/src/main/java/org/bitcoinj/core/Utils.java
+++ b/core/src/main/java/org/bitcoinj/core/Utils.java
@@ -561,8 +561,8 @@ public class Utils {
     private static Runtime runtime = null;
     private static OS os = null;
     static {
-        String runtimeProp = System.getProperty("java.runtime.name").toLowerCase(Locale.US);
-        if (runtimeProp == null)
+        String runtimeProp = System.getProperty("java.runtime.name", "").toLowerCase(Locale.US);
+        if (runtimeProp.equals(""))
             runtime = null;
         else if (runtimeProp.contains("android"))
             runtime = Runtime.ANDROID;
@@ -573,8 +573,8 @@ public class Utils {
         else
             log.info("Unknown java.runtime.name '{}'", runtimeProp);
 
-        String osProp = System.getProperty("os.name").toLowerCase(Locale.US);
-        if (osProp == null)
+        String osProp = System.getProperty("os.name", "").toLowerCase(Locale.US);
+        if (osProp.equals(""))
             os = null;
         else if (osProp.contains("linux"))
             os = OS.LINUX;