Upgrade to Kotlin 2.1.0 #45486
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theme: major-upgrade
Issues relating to the major upgrades in 4.0.0
type: dependency-upgrade
A dependency upgrade
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philwebb
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type: dependency-upgrade
philwebb
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May 10, 2025
This commit upgrades to Kotlin 2.1.0. Two related dependencies have been updated as well: Kotlin Coroutines to 1.10, and Kotlin Serialization to 1.8. As of Kotlin 2, it is no longer possible to have a Java type and a Kotlin type with the same name. As our code samples follow that unfortunate pattern, this commit makes sure that the Kotlin sample code does not depend on any of the Java counterpart and configure the kotlin compilation plugin to ignore Java sources. The minimum version of Gradle is 7.6.4. It bundles a version of Kotlin that cannot compile a Kotlin build script when spring-core, compiled with Kotlin 2.1, is on the classpath. Using Gradle 8.12 to run the DSL tests avoids the problem. Closes gh-45486 Co-authored-by: Andy Wilkinson <[email protected]>
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