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[aspectj-users] AspectJ 1.9.21 with Java 21 support
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Dear AspectJ users,
we are pleased to announce the AspectJ bugfix release 1.9.21 supporting Java 21. Please note that since 1.9.19, the minor-minor version indicates the corresponding latest Java release (byte code version) supported by the AspectJ compiler and weaver. I.e., 1.9.21 → Java 21.
Sorry for the delay. Actually, there was a Java 21 snapshot version early after the Java release. But unfortunately, even after holding back the AspectJ release for 3 months after JDK 21 general availability, waiting for Eclipse JDT Core and the Eclipse Java Compiler (ECJ) to catch up with Java 21 language features, even with Java 21 officially supported in Eclipse 2023-12, some preview features are still unimplemented in ECJ. Today, I decided to release anyway, because users have been asking for it. See release notes link below.
Please note:
- Since 1.9.21, the AspectJ compiler AJC (contained in the aspectjtools library) no longer works on JDKs 11 to 16. The minimum compile-time requirement is now JDK 17 due to upstream changes in the Eclipse Java Compiler (subset of JDT Core), which AspectJ is a fork of. You can still compile to legacy target versions as low as Java 1.3 when compiling plain Java code or using plain Java ITD constructs which do not require the AspectJ runtime aspectjrt, but the compiler itself needs JDK 17+. Just like in previous AspectJ versions, both the runtime aspectjrt and the load-time weaver aspectjweaver still only require JRE 8+.
- History: Since 1.9.7, the AspectJ compiler AJC needed JDK 11+, before then JDK 8+.
Other resources:
- For more detailed release information, please read the release notes.
- The current artifacts (runtime, weaver, compiler, matcher) are available on Maven Central.
- The AspectJ installer can be found on GitHub.
- There is also an AJDT update site for Eclipse 4.30 (2023-12). Unfortunately, updates sites for previous Eclipse versions , e.g. 4.26 (2022-12) and 4.23 (2022-03) are no longer compatible with AspectJ 1.9.21, because the latter dependes on upstream Eclipse changes. So if you want to use ADJT builds with Eclipse IDE, you need to upgrade to 2023-12. Otherwise, you can only use AspectJ 1.9.21 via Maven build, not via direct IDE. On top of that, you also need an extra update site for Eclipse 2023-12 itself. The IDE guide explains, why this is necessary.
- On GitHub, there also is a short guide describing options for setting up a development environment.
- See AspectJ GitHub issue #95 for more information and for an example project showing how to upgrade to the latest AspectJ version when using dev.aspectj:aspectj-maven-plugin:1.13.1.
Enjoy AspectJ!
The AspectJ team
