Gradle: Versions, Compatibility & Release History

import org.gradle.util.GradleVersion

// Fail early, with a readable message, when the wrapper is older than the build expects
require(GradleVersion.current() >= GradleVersion.version("9.0")) {
    "This build needs Gradle 9.0 or newer, but it runs on ${GradleVersion.current()}"
}

tasks.register("versions") {
    // Read everything at configuration time so the task action touches no Project state
    val gradleVersion = GradleVersion.current().version
    val jvmVersion = JavaVersion.current().toString()
    val kotlinVersion = KotlinVersion.CURRENT.toString()
    val groovyVersion = groovy.lang.GroovySystem.getVersion()
    doLast {
        println("Gradle $gradleVersion, JVM $jvmVersion, embedded Kotlin $kotlinVersion, embedded Groovy $groovyVersion")
    }
}

import org.gradle.util.GradleVersion

// Fail early, with a readable message, when the wrapper is older than the build expects
if (GradleVersion.current() < GradleVersion.version('9.0')) {
    throw new GradleException("This build needs Gradle 9.0 or newer, but it runs on ${GradleVersion.current()}")
}

tasks.register('versions') {
    // Read everything at configuration time so the task action touches no Project state
    def gradleVersion = GradleVersion.current().version
    def jvmVersion = JavaVersion.current().toString()
    def kotlinVersion = kotlin.KotlinVersion.CURRENT.toString()
    def groovyVersion = GroovySystem.version
    doLast {
        println "Gradle $gradleVersion, JVM $jvmVersion, embedded Kotlin $kotlinVersion, embedded Groovy $groovyVersion"
    }
}

./gradlew --configuration-cache versions
./gradlew --configuration-cache versions

Calculating task graph as no cached configuration is available for tasks: versions

> Task :versions
Gradle 9.8.1, JVM 26, embedded Kotlin 2.4.10, embedded Groovy 4.0.33

BUILD SUCCESSFUL in 424ms
1 actionable task: 1 executed
Configuration cache entry stored.

Reusing configuration cache.

> Task :versions
Gradle 9.8.1, JVM 26, embedded Kotlin 2.4.10, embedded Groovy 4.0.33

BUILD SUCCESSFUL in 444ms
1 actionable task: 1 executed
Configuration cache entry reused.

------------------------------------------------------------
Gradle 9.8.1
------------------------------------------------------------

Build time:    2026-10-07 16:57:46 UTC
Revision:      39daf39feb60a18b1b6ddccde53366522fef516f

Kotlin:        2.4.10
Groovy:        4.0.33
Ant:           Apache Ant(TM) version 1.10.17 compiled on April 6 2026
Launcher JVM:  26 (Oracle Corporation 26+35-2893)
Daemon JVM:    /Library/Java/JavaVirtualMachines/jdk-26.jdk/Contents/Home (no Daemon JVM specified, using current Java home)
OS:            Mac OS X 27.0.1 aarch64

FAILURE: Build failed with an exception.

* Where:
Build file '<work>/kts-guard/build.gradle.kts' line: 4

* What went wrong:
This build needs Gradle 9.9 or newer, but it runs on Gradle 9.8.1

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.

BUILD FAILED in 408ms

FAILURE: Build failed with an exception.

* Where:
Build file '<work>/groovy-guard/build.gradle' line: 5

* What went wrong:
A problem occurred evaluating root project 'tidepool'.
> This build needs Gradle 9.9 or newer, but it runs on Gradle 9.8.1

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.

BUILD FAILED in 319ms

Gradle 9.8.1
Kotlin:        2.4.10
Launcher JVM:  17.0.14 (JetBrains s.r.o. 17.0.14+1-b1367.22)
Gradle 9.8.1
Kotlin:        2.4.10
Launcher JVM:  21.0.10 (JetBrains s.r.o. 21.0.10+7-b1163.110)

./gradlew -q javaToolchains

 + Options
     | Auto-detection:     Enabled
     | Auto-download:      Enabled

 + JetBrains JDK 17 (17.0.14+1-b1367.22)
     | Location:           <home>/Library/Java/JavaVirtualMachines/jbr-17.0.14/Contents/Home
     | Language Version:   17
     | Vendor:             JetBrains
     | Architecture:       aarch64
     | Is JDK:             true
     | Detected by:        IntelliJ

 + JetBrains JDK 21 (21.0.10+7-b1163.110)
     | Location:           <home>/Library/Java/JavaVirtualMachines/jbr-21.0.10/Contents/Home
     | Language Version:   21
     | Vendor:             JetBrains
     | Architecture:       aarch64
     | Is JDK:             true
     | Detected by:        IntelliJ

 + Oracle JDK 26 (26+35-2893)
     | Location:           /Library/Java/JavaVirtualMachines/jdk-26.jdk/Contents/Home
     | Language Version:   26
     | Vendor:             Oracle
     | Architecture:       aarch64
     | Is JDK:             true
     | Detected by:        Current JVM

./gradlew --help | grep -i incubating

  --non-interactive                  Do not do interactive prompting. [incubating]
  --configure-on-demand              Configures necessary projects only. Gradle will attempt to reduce configuration time for large multi-project builds. [incubating]
  --no-configure-on-demand           Disables the use of configuration on demand. [incubating]
  --isolated-projects                Enables Isolated Projects. Projects are configured in parallel. Implies `--configuration-cache`. [incubating]
  --no-isolated-projects             Disables Isolated Projects. [incubating]
  --update-locks                     Performs a partial update of the dependency lock. Allows passed-in module notations to change version. [incubating]
  --problems-report                  Enables the HTML problems report. [incubating]
  --no-problems-report               Disables the HTML problems report. [incubating]
  --property-upgrade-report          Runs the build with the experimental property upgrade report. [incubating]

// The Kotlin DSL has no implicit lookup: the root project's property is read explicitly
val tideVersion = rootProject.extra["tideVersion"] as String
println("tidepool-engine uses tide data $tideVersion")

// tideVersion is defined in the root project; this is an implicit lookup in a parent project
println "tidepool-engine uses tide data ${tideVersion}"

> Configure project :tidepool-engine
Build file '<work>/groovy-dep/tidepool-engine/build.gradle': line 2
Implicit lookup of properties in parent projects has been deprecated. This will fail with an error in Gradle 10. Property 'tideVersion' was not declared in project ':tidepool-engine' and was resolved from root project 'tidepool'. This lookup was initiated by a dynamic invocation in the build script. Consult the upgrading guide for further information: https://docs.gradle.org/9.8.1/userguide/upgrading_version_9.html#deprecated_implicit_lookup_in_parent_projects
	at build_5jtgaiczg906awysza6zeqgda.run(<work>/groovy-dep/tidepool-engine/build.gradle:2)
	(Run with --stacktrace to get the full stack trace of this deprecation warning.)
tidepool-engine uses tide data 1.0
:help SKIPPED

[Incubating] Problems report is available at: file://<work>/groovy-dep/build/reports/problems/problems-report.html

BUILD SUCCESSFUL in 260ms
Consider enabling configuration cache to speed up this build: https://docs.gradle.org/9.8.1/userguide/configuration_cache_enabling.html

// Gradle 9.6: opt in to the Gradle 10 behavior now
enableFeaturePreview("NO_IMPLICIT_LOOKUP_IN_PARENT_PROJECTS")

// Gradle 9.6: opt in to the Gradle 10 behavior now
enableFeaturePreview 'NO_IMPLICIT_LOOKUP_IN_PARENT_PROJECTS'

FAILURE: Build failed with an exception.

* Where:
Build file '<work>/groovy-pre/tidepool-engine/build.gradle' line: 2

* What went wrong:
A problem occurred evaluating project ':tidepool-engine'.
> Could not get unknown property 'tideVersion' for project ':tidepool-engine' of type org.gradle.api.Project.

* Try:
> Run with --stacktrace to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.

BUILD FAILED in 300ms

> Configure project :tidepool-engine
tidepool-engine uses tide data 1.0
:help SKIPPED

BUILD SUCCESSFUL in 261ms
Consider enabling configuration cache to speed up this build: https://docs.gradle.org/9.8.1/userguide/configuration_cache_enabling.html