Fix IllegalAccessException in MongoDbAtlasLocalContainerConnectionDetails.getSslBundle()

The original fix in commit 03d475e introduced a MethodHandles.unreflectSpecial()
approach to resolve a StackOverflowError, but this caused IllegalAccessException
due to incorrect usage of unreflectSpecial() for interface default methods.

The unreflectSpecial() method is designed for superclass method calls, not
interface default methods, and requires private access which caused:
"IllegalAccessException: no private access for invokespecial: interface
org.springframework.boot.autoconfigure.mongo.MongoConnectionDetails"

This fix replaces the complex reflection approach with simple interface
delegation using 'MongoConnectionDetails.super.getSslBundle()'. This solution:

- Eliminates IllegalAccessException by properly overriding with public access
- Avoids StackOverflowError by delegating to interface default method
- Removes all reflection code, making it simpler and more maintainable
- Works across all Spring Boot versions without version-specific checks
- Resolves access privilege conflict between interface and parent class

The interface default method returns null, which is the desired behavior
for SSL configuration when no custom SSL bundle is provided.

Fixes: https://github.com/spring-projects/spring-ai/actions/runs/16981113833

Signed-off-by: Mark Pollack <[email protected]>

Author: markpollack

spring-ai-spring-boot-testcontainers/src/main/java/org/springframework/ai/testcontainers/service/connection/mongo/MongoDbAtlasLocalContainerConnectionDetailsFactory.java

@@ -16,17 +16,13 @@
 
 package org.springframework.ai.testcontainers.service.connection.mongo;
 
-import java.lang.invoke.MethodHandles;
-import java.lang.reflect.Method;
-
 import com.mongodb.ConnectionString;
 import org.testcontainers.mongodb.MongoDBAtlasLocalContainer;
 
 import org.springframework.boot.autoconfigure.mongo.MongoConnectionDetails;
 import org.springframework.boot.ssl.SslBundle;
 import org.springframework.boot.testcontainers.service.connection.ContainerConnectionDetailsFactory;
 import org.springframework.boot.testcontainers.service.connection.ContainerConnectionSource;
-import org.springframework.util.ReflectionUtils;
 
 /**
  * A {@link ContainerConnectionDetailsFactory} implementation that provides
@@ -51,12 +47,6 @@
 class MongoDbAtlasLocalContainerConnectionDetailsFactory
 		extends ContainerConnectionDetailsFactory<MongoDBAtlasLocalContainer, MongoConnectionDetails> {
 
-	private static final Method GET_SSL_BUNDLE_METHOD;
-
-	static {
-		GET_SSL_BUNDLE_METHOD = ReflectionUtils.findMethod(MongoConnectionDetails.class, "getSslBundle");
-	}
-
 	@Override
 	protected MongoConnectionDetails getContainerConnectionDetails(
 			ContainerConnectionSource<MongoDBAtlasLocalContainer> source) {
@@ -79,21 +69,10 @@ public ConnectionString getConnectionString() {
 			return new ConnectionString(getContainer().getConnectionString());
 		}
 
-		// Conditional implementation based on whether the method exists
+		@Override
 		public SslBundle getSslBundle() {
-			if (GET_SSL_BUNDLE_METHOD != null) { // Boot 3.5.x+
-				try {
-					return (SslBundle) MethodHandles.lookup()
-						.in(GET_SSL_BUNDLE_METHOD.getDeclaringClass())
-						.unreflectSpecial(GET_SSL_BUNDLE_METHOD, GET_SSL_BUNDLE_METHOD.getDeclaringClass())
-						.bindTo(this)
-						.invokeWithArguments();
-				}
-				catch (Throwable e) {
-					throw new RuntimeException(e);
-				}
-			}
-			return null; // Boot 3.4.x (No-Op)
+			// Delegate to the interface default method by calling it explicitly
+			return MongoConnectionDetails.super.getSslBundle();
 		}
 
 	}