From 16e48850ed2c0ebcf8b66b0588927c1df34e3aae Mon Sep 17 00:00:00 2001
From: Ry Biesemeyer <ry.biesemeyer@elastic.co>
Date: Sun, 20 Jan 2019 18:07:39 +0000
Subject: [PATCH] add Java 9+ support to ChildProcess dependency

this can safely be removed when the childprocess gem supports Java9+
https://github.com/enkessler/childprocess/pull/141
---
 .../patch/childprocess-modern-java.rb         | 23 +++++++++++++++++++
 qa/integration/services/logstash_service.rb   |  1 +
 2 files changed, 24 insertions(+)
 create mode 100644 qa/integration/patch/childprocess-modern-java.rb

diff --git a/qa/integration/patch/childprocess-modern-java.rb b/qa/integration/patch/childprocess-modern-java.rb
new file mode 100644
index 00000000000..7a2125d3769
--- /dev/null
+++ b/qa/integration/patch/childprocess-modern-java.rb
@@ -0,0 +1,23 @@
+# encoding: utf-8
+
+# Implementation of ChildProcess::JRuby::Process#pid depends heavily on
+# what Java SDK is being used; here, we look it up once at load, then
+# override that method with an implementation that works on modern Javas
+# if necessary.
+#
+# This patch can be removed when the upstream childprocess gem supports Java 9+
+# https://github.com/enkessler/childprocess/pull/141
+normalised_java_version_major = java.lang.System.get_property("java.version")
+                                    .slice(/^(1\.)?([0-9]+)/, 2)
+                                    .to_i
+
+if normalised_java_version_major >= 9
+  $stderr.puts("patching childprocess for Java9+ support...")
+  ChildProcess::JRuby::Process.class_exec do
+    def pid
+      @process.pid
+    rescue java.lang.UnsupportedOperationException => e
+      raise NotImplementedError, "pid is not supported on this platform: #{e.message}"
+    end
+  end
+end
\ No newline at end of file
diff --git a/qa/integration/services/logstash_service.rb b/qa/integration/services/logstash_service.rb
index 5f0f603cfb8..ca1729787c1 100644
--- a/qa/integration/services/logstash_service.rb
+++ b/qa/integration/services/logstash_service.rb
@@ -1,6 +1,7 @@
 require_relative "monitoring_api"
 
 require "childprocess"
+require_relative "../patch/childprocess-modern-java"
 require "bundler"
 require "socket"
 require "tempfile"