Migrate Spring Boot Banking Application from Java 17 to Java 21 #11
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- Update Java version property in pom.xml from 17 to 21 - Fix Maven compiler plugin configuration from Java 1.8 to Java 21 - Update Docker build stage base image to maven:3.8.3-openjdk-21 - Update Docker runtime stage base image to openjdk:21-alpine - Update Jenkins installation docs from openjdk-17-jre to openjdk-21-jre in both README files - Verified Spring Boot 3.3.3 compatibility with Java 21 Co-Authored-By: jia.wu@codeium.com <jia_wu@hotmail.ca>
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Migrate Spring Boot Banking Application from Java 17 to Java 21
Summary
Comprehensive migration of the Spring Boot banking application from Java 17 to Java 21, addressing all Java version references across the project:
java.versionproperty from 17 to 21 and fixed Maven compiler plugin inconsistency (was targeting Java 1.8, now properly targets Java 21)maven:3.8.3-openjdk-21) and runtime stage (openjdk:21-alpine) base imagesopenjdk-21-jreThis migration resolves the previous inconsistency where the project declared Java 17 as the target version but the Maven compiler was still targeting Java 1.8.
Review & Testing Checklist for Human
The following items require verification before merging (4 critical items):
mvn clean compile) to ensure all code compiles successfullydocker build .) to confirm the new base images are available and the containerized application builds successfullyNotes