RSocket revolutionizes app communication in Spring Boot, offering seamless interaction, backpressure handling, and scalability. It supports various protocols and interaction models, making it ideal for real-time, high-throughput applications. Despite a learning curve, its benefits are significant.

Java's Foreign Function Interface simplifies native code integration, replacing JNI. It offers safer memory management and easier C/C++ library usage. FFI opens new possibilities for Java developers, combining Java's ease with C++'s performance.

API gateways control access, enhance security, and optimize performance. Advanced techniques include authentication, rate limiting, request aggregation, caching, circuit breaking, and versioning. These features streamline architecture and improve user experience.

Java performance tuning optimizes code efficiency through profiling, algorithm selection, collection usage, memory management, multithreading, database optimization, caching, I/O operations, and JVM tuning. Measure, optimize, and repeat for best results.

Java's Reflection API enables runtime inspection and manipulation of classes, methods, and fields. It allows dynamic object creation, method invocation, and access to private members, enhancing flexibility in coding and framework development.

Advanced Java optimizes Big Data processing with Hadoop, Spark, streams, and concurrency. It offers efficient data manipulation, parallel processing, and scalable solutions for handling massive datasets effectively.

Java's modern features enhance coding efficiency: diamond operator, try-with-resources, Optional, method references, immutable collections, enhanced switch, time manipulation, ForkJoinPool, advanced enums, and Stream API.

Java socket programming enables network communication. It's crucial for creating chat apps, games, and distributed systems. Mastering sockets allows building robust networked applications using Java's java.net package.

Java's var keyword for local variable type inference sparks debate. Proponents praise conciseness, critics worry about readability. Usage requires balance between convenience and clarity in coding practices.

Java evolves with var keyword, Stream API, CompletableFuture, Optional class, and switch expressions. These features enhance readability, functionality, asynchronous programming, null handling, and code expressiveness, improving overall development experience.

Advanced Java debugging techniques: conditional breakpoints, logging frameworks, thread dumps, memory profilers, remote debugging, exception breakpoints, and diff debugging. These tools help identify and fix complex issues efficiently.

Micronaut, Prometheus, and Grafana form a powerful monitoring solution for cloud applications. Custom metrics, visualizations, and alerting provide valuable insights into application performance and user behavior.