CIS-3896 Upgrade to Spring Boot 4 and Java 21 - #64
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Upgrade to Spring Boot 4 using OpenRewrite and bump the Java version to Java 21.
heathharrelson
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Oct 2, 2026
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| if (value instanceof LocalDate date) { | ||
| return dateFormatter.print(date); | ||
| } else if (value instanceof LocalDateTime time) { | ||
| return dateTimeFormatter.print(time); |
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This is new syntax as of Java 16 that allows using the value checked by instanceof without a cast.
saligiad
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Oct 2, 2026
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Are the updated artifact IDs here (spring-boot-starter-webmvc and webjars-locator-lite) something you had to do manually, or was that handled by OpenRewrite?
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This was handled by OpenRewrite. Spring Boot's packages were made more granular, and the OpenRewrite recipe knows what transformations to make.
saligiad
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Oct 2, 2026
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Overview
Upgrade to Spring Boot 4 using OpenRewrite and bump the Java version to Java 21.
Issues
CIS-3896
[X] Added to CHANGELOG.md