• 39 Posts
  • 31 Comments
Joined 1 year ago
cake
Cake day: November 6th, 2025

help-circle














  • JADEx is a solution designed to enhance null-safety in Java. Its key advantage is that existing Java developers can gain null-safety and immutability without any learning curve. As a result, compared to migrating to Kotlin, JADEx offers a much more cost-effective way to significantly improve the stability of the legacy Java codebases that many companies continue to operate.

    In addition, JADEx provides immutability, allowing developers to strengthen immutability without the verbose use of the final keyword.




  • Let me correct a misunderstanding. JADEx was created as a Java superset language to strengthen Java’s insufficient null-related type system. In JADEx, Java’s reference types are assumed to be non-null by default, and through the nullability static analysis results provided by JADEx, developers can explicitly choose to mark types as nullable. Because of this, there is no problem using null-safe access operators and the Elvis operator.

    To summarize:

    • Java: All types are nullable; there is no non-null type. Therefore, Elvis operators and null-safe access operators cannot be used.
    • JADEx: Both nullable and non-null types exist. Therefore, Elvis operators and null-safe access operators can be used.















  • Thank you for the excellent question.

    1. How does JPlus handle null safety in Java library interfaces?

    • JPlus is currently implemented at the MVP level. Therefore, all Java library interfaces are treated as non-null by default. As a result, developers need to manually check for nullability when interacting with Java libraries.

    • When referencing Java library objects, always declare the variables as nullable (type?) and use the null-safe operator (?.) when accessing them to prevent null pointer exceptions (NPEs).

    • In future implementations, we plan to leverage nullability annotations in Java library code to add null-checking logic. However, since not all Java libraries include such annotations, developers will still need to manually handle null checks. The same applies to Kotlin: platform types are used, so developers are responsible for performing null checks.


    2. If nullability information is a type metadata extension for compile-time checking, does that inevitably break on library interfaces when I create both library and consuming app with JPlus?

    • In the current JPlus MVP, when converting to Java code, nullability information specified in the JPlus files is not converted into @Nullable/@Nonnull annotations.

    • Therefore, using static analysis tools that rely on these annotations may cause issues at compile time.

    • This feature will be supported in the next version, which will include conversion to @Nullable/@Nonnull. Thank you for your valuable feedback.


    Finally, for faster responses, please post any future questions on the JPlus GitHub Discussions page: https://github.com/nieuwmijnleven/JPlus/discussions.