fix: handle null bounds in WindowLocation to prevent NPE on dialog dispose (PR #2826)

* fix: handle null bounds in WindowLocation to prevent NPE on dialog dispose

The equals(), hashCode(), and toString() methods in WindowLocation
could throw NullPointerException when bounds is null. This happens
when a dialog window is disposed before its bounds are fully
initialized (e.g., on macOS when closing the search dialog).

Use Objects.equals()/Objects.hashCode() for null-safe comparisons
and add a null guard in toString().

Fixes #2571

* additional null checks and null annotations

---------

Co-authored-by: easonysliu <easonysliu@tencent.com>
Co-authored-by: Skylot <118523+skylot@users.noreply.github.com>

Author: 3 people

jadx-gui/src/main/java/jadx/gui/settings/JadxSettings.java

@@ -220,38 +220,49 @@ public void removeRecentProject(Path projectPath) {
 		recentProjects.remove(projectPath);
 	}
 
+	private static String makeWindowId(Window window) {
+		return window.getClass().getSimpleName();
+	}
+
+	@SuppressWarnings("ConstantValue")
 	public void saveWindowPos(Window window) {
+		if (window == null) {
+			return;
+		}
 		synchronized (dataWriteSync) {
-			WindowLocation pos = new WindowLocation(window.getClass().getSimpleName(), window.getBounds());
-			settingsData.getWindowPos().put(pos.getWindowId(), pos);
+			Rectangle bounds = window.getBounds();
+			if (bounds != null) {
+				WindowLocation pos = new WindowLocation(makeWindowId(window), bounds);
+				settingsData.getWindowPos().put(pos.getWindowId(), pos);
+			}
 		}
 	}
 
 	public boolean loadWindowPos(Window window) {
-		Map<String, WindowLocation> windowPos = settingsData.getWindowPos();
-		WindowLocation pos = windowPos.get(window.getClass().getSimpleName());
-		if (pos == null || pos.getBounds() == null) {
+		String windowId = makeWindowId(window);
+		WindowLocation pos = settingsData.getWindowPos().get(windowId);
+		if (pos == null) {
 			return false;
 		}
-		if (!isAccessibleInAnyScreen(pos)) {
+		Rectangle bounds = pos.getBounds();
+		if (bounds == null || !isAccessibleInAnyScreen(windowId, bounds)) {
 			return false;
 		}
-		window.setBounds(pos.getBounds());
+		window.setBounds(bounds);
 		if (window instanceof MainWindow) {
 			((JFrame) window).setExtendedState(getMainWindowExtendedState());
 		}
 		return true;
 	}
 
-	private static boolean isAccessibleInAnyScreen(WindowLocation pos) {
-		Rectangle windowBounds = pos.getBounds();
+	private static boolean isAccessibleInAnyScreen(String windowId, Rectangle windowBounds) {
 		for (GraphicsDevice gd : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()) {
 			Rectangle screenBounds = gd.getDefaultConfiguration().getBounds();
 			if (screenBounds.intersects(windowBounds)) {
 				return true;
 			}
 		}
-		LOG.debug("Window saved position was ignored: {}", pos);
+		LOG.debug("Window saved position was ignored: {}, bounds: {}", windowId, windowBounds);
 		return false;
 	}
 

jadx-gui/src/main/java/jadx/gui/settings/WindowLocation.java

@@ -1,16 +1,20 @@
 package jadx.gui.settings;
 
 import java.awt.Rectangle;
+import java.util.Objects;
 
+import org.jetbrains.annotations.Nullable;
+
+@SuppressWarnings("unused")
 public class WindowLocation {
 	private String windowId;
-	private Rectangle bounds;
+	private @Nullable Rectangle bounds;
 
-	// Don't remove. Used in json serialization
+	// Don't remove. Used in JSON serialization
 	public WindowLocation() {
 	}
 
-	public WindowLocation(String windowId, Rectangle bounds) {
+	public WindowLocation(String windowId, @Nullable Rectangle bounds) {
 		this.windowId = windowId;
 		this.bounds = bounds;
 	}
@@ -23,37 +27,31 @@ public void setWindowId(String windowId) {
 		this.windowId = windowId;
 	}
 
-	public Rectangle getBounds() {
+	public @Nullable Rectangle getBounds() {
 		return bounds;
 	}
 
-	public void setBounds(Rectangle bounds) {
+	public void setBounds(@Nullable Rectangle bounds) {
 		this.bounds = bounds;
 	}
 
 	@Override
 	public int hashCode() {
-		return windowId.hashCode();
+		return Objects.hashCode(windowId);
 	}
 
 	@Override
 	public final boolean equals(Object o) {
 		if (o instanceof WindowLocation) {
 			WindowLocation that = (WindowLocation) o;
-			return windowId.equals(that.windowId) && bounds.equals(that.bounds);
+			return Objects.equals(windowId, that.windowId)
+					&& Objects.equals(bounds, that.bounds);
 		}
 		return false;
-
 	}
 
 	@Override
 	public String toString() {
-		return "WindowLocation{"
-				+ "id='" + windowId + '\''
-				+ ", x=" + bounds.getX()
-				+ ", y=" + bounds.getY()
-				+ ", width=" + bounds.getWidth()
-				+ ", height=" + bounds.getHeight()
-				+ '}';
+		return "WindowLocation{id=" + windowId + ", bounds=" + bounds + '}';
 	}
 }