Fix IllegalAccessException in MongoDbAtlasLocalContainerConnectionDetails.getSslBundle()

[markpollack]

Summary

Fixes the IllegalAccessException introduced by the StackOverflowError fix in commit 03d475e by replacing complex MethodHandles reflection with simple interface delegation.

Problem

The original fix used MethodHandles.unreflectSpecial() incorrectly for interface default methods, causing:

IllegalAccessException: no private access for invokespecial: interface 
org.springframework.boot.autoconfigure.mongo.MongoConnectionDetails

Root Cause

• unreflectSpecial() is designed for superclass method calls, not interface default methods
• The lookup context lacked the required private access for invokespecial calls
• Access privilege conflict between interface public method and parent class method

Solution

Replaced 24 lines of complex reflection code with 3 lines of elegant interface delegation:

@Override
public SslBundle getSslBundle() {
    return MongoConnectionDetails.super.getSslBundle();
}

Benefits

• ✅ Eliminates IllegalAccessException by properly overriding with public access
• ✅ Avoids the original 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

Test Results

• ✅ MongoDbAtlasLocalContainerConnectionDetailsFactoryIT.addAndSearch passes
• ✅ All testcontainer module tests pass
• ✅ No regressions introduced

Fixes

• CI Failure: https://github.com/spring-projects/spring-ai/actions/runs/16981113833
• Original StackOverflowError issue from commit 03d475e

[markpollack]

this is on top of an old base it seems, i'm creating a new PR.