1 files changed, 80 insertions, 0 deletions
diff --git a/archived/projt-launcher/launcher/minecraft/launch/VerifyJavaInstall.cpp b/archived/projt-launcher/launcher/minecraft/launch/VerifyJavaInstall.cpp
new file mode 100644
index 0000000000..18c6d0efca
--- /dev/null
+++ b/archived/projt-launcher/launcher/minecraft/launch/VerifyJavaInstall.cpp
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: 2026 Project Tick
+// SPDX-FileContributor: Project Tick Team
+/*
+ *  ProjT Launcher - Minecraft Launcher
+ *  Copyright (C) 2026 Project Tick
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, write to the Free Software Foundation,
+ *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "VerifyJavaInstall.hpp"
+#include <memory>
+
+#include "Application.h"
+#include "MessageLevel.h"
+#include "java/core/RuntimeVersion.hpp"
+#include "minecraft/MinecraftInstance.h"
+#include "minecraft/PackProfile.h"
+
+void VerifyJavaInstall::executeTask()
+{
+	auto instance			 = m_flow->instance();
+	auto packProfile		 = instance->getPackProfile();
+	auto settings			 = instance->settings();
+	auto storedVersion		 = settings->get("JavaVersion").toString();
+	auto ignoreCompatibility = settings->get("IgnoreJavaCompatibility").toBool();
+	auto javaArchitecture	 = settings->get("JavaArchitecture").toString();
+	auto maxMemAlloc		 = settings->get("MaxMemAlloc").toInt();
+
+	if (javaArchitecture == "32" && maxMemAlloc > 2048)
+	{
+		emit logLine(tr("Max memory allocation exceeds the supported value.\n"
+						"The selected installation of Java is 32-bit and doesn't support more than 2048MiB of RAM.\n"
+						"The instance may not start due to this."),
+					 MessageLevel::Error);
+	}
+
+	auto compatibleMajors = packProfile->getProfile()->getCompatibleJavaMajors();
+
+	projt::java::RuntimeVersion javaVersion(storedVersion);
+
+	if (compatibleMajors.isEmpty() || compatibleMajors.contains(javaVersion.major()))
+	{
+		emitSucceeded();
+		return;
+	}
+
+	if (ignoreCompatibility)
+	{
+		emit logLine(tr("Java major version is incompatible. Things might break."), MessageLevel::Warning);
+		emitSucceeded();
+		return;
+	}
+
+	emit logLine(tr("This instance is not compatible with Java version %1.\n"
+					"Please switch to one of the following Java versions for this instance:")
+					 .arg(javaVersion.major()),
+				 MessageLevel::Error);
+	for (auto major : compatibleMajors)
+	{
+		emit logLine(tr("Java version %1").arg(major), MessageLevel::Error);
+	}
+	emit logLine(tr("Go to instance Java settings to change your Java version or disable the Java compatibility check "
+					"if you know what "
+					"you're doing."),
+				 MessageLevel::Error);
+
+	emitFailed(QString("Incompatible Java major version"));
+}