fidzu : programming

This is the third follow-up to Friday's release post. Saturday's was about how you iterate; yesterday's was about new platform APIs in the core; today's is about a run of pieces that change how you write the structural parts of an app.

The pieces are an OpenAPI client generator, a SQLite ORM, JSON and XML mappers, a component binder with validation, build-time SVG and Lottie transcoders, and a declarative router with deep links. All ride on a single build-time codegen pipeline: a Maven-plugin pass that reads annotations or declarative source files at build time and emits typed Java that compiles into your binary. No reflection, no service loader, no Class.forName. The "How it works" section at the end of this post covers the codegen plumbing once you have seen what it powers.

17 Jun 2026 7:00pm GMT

This is the first follow-up to Friday's release post, and it covers the two changes from this release that affect how you iterate on a Codename One app rather than what the app itself does. On-device debugging that treats Java as Java on a real iPhone or a real Android device, and standard JUnit 5 against the JavaSE simulator. The first is the one we have been wanting for a long time, and is the one that takes the most explaining, so most of the post is about it.

On-Device Debugging That Treats Java as Java

Codename One has always supported on-device debugging in the strict technical sense. You could attach Xcode to a .ipa, you could attach Android Studio to a running APK, you could read the native call stack, you could step through Objective-C or the C that ParparVM emits. What you could not do was set a breakpoint in MyForm.java, hit it on a real iPhone, and inspect a Java field on a Java object as a Java object. You also could not debug an iOS app without a Mac in the loop somewhere, because the only debugger that understood the binary was Xcode. The translation step between the Java you wrote and the C that ParparVM produces left no way back across the gap on the device.

17 Jun 2026 3:00pm GMT

The MovieManager project has been updated to use JDK 25 and the AOT cache from project Leyden. Project Leyden is part of the OpenJDK project and provides cached linking and cached performance statistics. That means the time spent linking at startup is moved to build time, and the statistics are created during a test run at build time as well.

Because of that, the JVM loads the needed classes already linked and starts compiling the hot code paths immediately. The MovieManager application starts in less than half the time with these optimizations without any code changes.

12 Jun 2026 4:00pm GMT