In today's ever-evolving software landscape, developers seek innovative solutions to seamlessly integrate the power of different programming languages within their projects. The package:jni offers a gateway for smooth interaction between Dart and Java through JNI (Java Native Interface). This talk aims to introduce developers to the transformative capabilities of JniGen, a powerful tool that automates the generation of Dart bindings for a given Java API, eliminating the need for manual boilerplate code. Beyond Java, package:jnigen goes the extra mile by compiling Kotlin to Java bytecode, thereby extending its capacity to generate bindings for Kotlin as well. This streamlines the process of integrating Kotlin code with Dart, making it more efficient and developer-friendly. During the session, we will explore the performance benefits of JniGen, showcasing how it empowers developers to optimize native code execution and elevate app performance to new heights. With JniGen's ability to seamlessly integrate with frameworks like Flutter, attendees will learn how to create cross-platform applications that leverage the full potential of Java's extensive libraries and Kotlin's expressive syntax. By the end of this session, developers will possess a comprehensive understanding of package:jnigen's potential, inspiring them to embrace a more efficient and developer-friendly approach to Java and Kotlin interop in their Dart projects.