From 8608c38c114cb59b20acff01c4184cb6afe5eae2 Mon Sep 17 00:00:00 2001
From: Fox2Code <fox2code@gmail.com>
Date: Wed, 3 Jun 2026 16:43:26 +0200
Subject: [PATCH] [Build] Auto select java21 as a java home on Linux if
 available;

---
 Engine/build_linux.sh | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Engine/build_linux.sh b/Engine/build_linux.sh
index 851cae11..8f7f030c 100755
--- a/Engine/build_linux.sh
+++ b/Engine/build_linux.sh
@@ -1,5 +1,25 @@
 #!/bin/sh
 
+STAPLE_REQUIRED_JDK_VERSION="21"
+STAPLE_JDK_CHECK_PASSED=""
+
+check_jvm() {
+	if [ -d "$1" ] && [ -f "$1/bin/java" ] && ("$1/bin/java" --version |& grep "build $STAPLE_REQUIRED_JDK_VERSION." &> /dev/null); then
+		STAPLE_JDK_CHECK_PASSED="yes"
+		export JAVA_HOME="$1"
+	fi
+}
+
+if [ -n "$JAVA_HOME" ]; then
+	check_jvm "$JAVA_HOME"
+fi
+for candidate in /usr/lib/jvm/*; do
+	if [ -n "$STAPLE_JDK_CHECK_PASSED" ]; then
+		break
+	fi
+	check_jvm "$candidate"
+done
+
 dotnet build Engine.sln -c Debug
 dotnet build Engine.sln -c Release