From 27e3d4a96d4bf4bf7c8c9e0e13b7c9f3ea663277 Mon Sep 17 00:00:00 2001
From: Gerwin Kuijntjes <administratie@gerwinkuijntjes.nl>
Date: Mon, 6 Apr 2026 07:48:32 +0200
Subject: [PATCH] Fix crash on Add Connection: use JavaCast for Android trust
 manager lookup

OfType<IX509TrustManager>() returns empty on Android because CLR type
checking does not work against Java proxy objects. JavaCast<> is the
correct API for casting Java-backed objects in MAUI Android bindings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../Xamarin.Neo4j.Android/Security/NativeTrustManager.cs    | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Xamarin.Neo4j/Xamarin.Neo4j/Xamarin.Neo4j.Android/Security/NativeTrustManager.cs b/Xamarin.Neo4j/Xamarin.Neo4j/Xamarin.Neo4j.Android/Security/NativeTrustManager.cs
index d8a1d1e..5ac6cf5 100644
--- a/Xamarin.Neo4j/Xamarin.Neo4j/Xamarin.Neo4j.Android/Security/NativeTrustManager.cs
+++ b/Xamarin.Neo4j/Xamarin.Neo4j/Xamarin.Neo4j.Android/Security/NativeTrustManager.cs
@@ -9,6 +9,7 @@ using System.IO;
 using System.Linq;
 using System.Net.Security;
 using System.Security.Cryptography.X509Certificates;
+using Android.Runtime;
 using Java.Security;
 using Java.Security.Cert;
 using Javax.Net.Ssl;
@@ -25,8 +26,9 @@ namespace Xamarin.Neo4j
             var factory = TrustManagerFactory.GetInstance(TrustManagerFactory.DefaultAlgorithm);
             factory.Init((KeyStore)null);
             _androidTrustManager = factory.GetTrustManagers()
-                .OfType<IX509TrustManager>()
-                .First();
+                .OfType<Java.Lang.Object>()
+                .Select(m => m.JavaCast<IX509TrustManager>())
+                .First(m => m != null);
         }
 
         public override bool ValidateServerCertificate(Uri uri, X509Certificate2 certificate, X509Chain chain,