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diff --git a/meshmc/launcher/JavaCommon.h b/meshmc/launcher/JavaCommon.h
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+++ b/meshmc/launcher/JavaCommon.h
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+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   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, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <java/JavaChecker.h>
+
+class QWidget;
+
+/**
+ * Common UI bits for the java pages to use.
+ */
+namespace JavaCommon
+{
+	bool checkJVMArgs(QString args, QWidget* parent);
+
+	// Show a dialog saying that the Java binary was not usable
+	void javaBinaryWasBad(QWidget* parent, JavaCheckResult result);
+	// Show a dialog saying that the Java binary was not usable because of bad
+	// options
+	void javaArgsWereBad(QWidget* parent, JavaCheckResult result);
+	// Show a dialog saying that the Java binary was usable
+	void javaWasOk(QWidget* parent, JavaCheckResult result);
+
+	class TestCheck : public QObject
+	{
+		Q_OBJECT
+	  public:
+		TestCheck(QWidget* parent, QString path, QString args, int minMem,
+				  int maxMem, int permGen)
+			: m_parent(parent), m_path(path), m_args(args), m_minMem(minMem),
+			  m_maxMem(maxMem), m_permGen(permGen)
+		{
+		}
+		virtual ~TestCheck() {};
+
+		void run();
+
+	  signals:
+		void finished();
+
+	  private slots:
+		void checkFinished(JavaCheckResult result);
+		void checkFinishedWithArgs(JavaCheckResult result);
+
+	  private:
+		std::shared_ptr<JavaChecker> checker;
+		QWidget* m_parent = nullptr;
+		QString m_path;
+		QString m_args;
+		int m_minMem = 0;
+		int m_maxMem = 0;
+		int m_permGen = 64;
+	};
+} // namespace JavaCommon