We use internal tools to detect null safety issues earlier, and we rigorously annotate our code as part of our work to detect such issues in Java earlier. We are very good at fixing them before releasing our apps, but dealing with those issues is still time-consuming. Nullability: Null pointer exceptions are a common problem at Meta, as everywhere else.We also compared the latest Kotlin version with Java 11, which is the latest version that can be used for Android development.Īside from its popularity, Kotlin holds some major advantages: Kotlin is generally regarded as a better language than Java, with higher favorability ratings than Java in the yearly Stack Overflow developer survey. Why we’re converting our codebase to Kotlin Shifting away from Java, which we currently use for Android development, and over to Kotlin is not a trivial task. Meta’s Android repository is very large and reaches across our family of apps and technologies, including Facebook, Instagram, Messenger, Portal, and the Quest. So it only makes sense that we would shift our Android development at Meta to Kotlin as we work to make our development workflows more efficient. In recent years, Kotlin has become a popular language for Android development. We’re open sourcing various examples and utilities we used to manipulate Kotlin code as part of this migration.As of today, our Android codebase contains over 10 million lines of Kotlin code.Kotlin is a popular language for Android development and offers some key advantages over Java.We’re sharing lessons learned from shifting our Android development from Java to Kotlin.

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