[PR] Camel 22996 drop java17 [camel-spring-boot-examples]

["apupier (via GitHub)" <gi...@apache.org>]

apupier opened a new pull request, #221:
URL: https://github.com/apache/camel-spring-boot-examples/pull/221

   ## Summary
   
   Java 17 support has been dropped in Camel core. This repository already builds on Java 21 (`javaVersion` in the root `pom.xml`, the CI workflows, `AGENTS.md`), so this PR only removes the leftover Java 17 references.
   
   JIRA: https://issues.apache.org/jira/browse/CAMEL-22996
   
   ## Changes
   
   One commit per change:
   
   1. **Use Java 21 base image for JKube builds**
      The root `pom.xml` set `jkube.generator.from` to `registry.access.redhat.com/ubi9/openjdk-17:latest`. It now uses `ubi9/openjdk-21:latest`, so container images built by the examples no longer run on a JDK older than the baseline. No module overrides this property.
   
   2. **Remove hardcoded Java 17 release from loggingtracer**
      `observation/loggingtracer` was the only module that set `maven.compiler.release` to 17. The property is removed.
   
   3. **Update README prerequisites to Java 21**
      `salesforce`, `genai-observability` and `aot-basic` (GraalVM download instructions) now say Java 21 instead of Java 17.
   
   ## Notes for reviewers
   
   - `observation/loggingtracer` has no `<parent>`, so it does not inherit `javaVersion` (21). Without the property, the compiler level falls back to the `maven-compiler-plugin` default. The module still compiles, but the classes are now Java 8 bytecode (class file major version 52). If you prefer Java 21 bytecode there, the module can either get the `examples` parent or set the release explicitly. I can add that if you want it in this PR.
   - I left `azure/pom.xml` unchanged. It sets `maven.compiler.source/target` to 8, which is not a Java 17 reference, and the build passes.
   - A repo-wide search for Java 17 / JDK 17 / `openjdk-17` finds no remaining references.
   
   ## Testing
   
   On JDK 21.0.9 (Temurin):
   
   - `./mvnw -V --no-transfer-progress clean install -DskipTests`: BUILD SUCCESS, all 102 modules, including `loggingtracer`.
   - `./mvnw -V --no-transfer-progress test`: BUILD SUCCESS, no test failures.
   
   I did not build or run any container image with the new `openjdk-21` base image. I only confirmed that the image exists in the Red Hat catalog.
   
   ---
   _Claude Code on behalf of Aurélien Pupier_


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