Gradle: Support installation of JDK version requested by Gradle Daemon JVM Discovery

[rarkins]

Discussed in #30164

^{Originally posted by davidburstrom July 13, 2024}

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Mend Renovate hosted app on github.com

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Please tell us more about your question or problem

The JDK that gets installed in order to run Gradle is resolved by Renovate based on the Gradle version in use (source). There is a new Gradle feature, Daemon JVM discovery, that dictates which (installed) JDK the daemon should be launched with.

By inspecting the gradle/gradle-daemon-jvm.properties file (if present), Renovate can resolve which JDK version it should install.

The reason I discovered this was because the job to update the Gradle wrapper (davidburstrom/contester#111) failed to run ./gradlew :wrapper, and while investigating the job logs, I found that it installed JDK 17 whereas Gradle requested JDK 21.

JDK selection is necessary to support cases where any applied Gradle plugins require a more modern JDK than Gradle itself requires.

Logs (if relevant)

Logs

DEBUG: Using containerbase dynamic installs (branch="renovate/gradle-8.x")
DEBUG: Resolved stable matching version (branch="renovate/gradle-8.x")
{
  "toolName": "java"
  "constraint": "^17.0.0"
  "resolvedVersion": "17.0.11+9"
}

DEBUG: Executing command (branch="renovate/gradle-8.x")
{
  "command": "install-tool java 17.0.11+9"
}

DEBUG: exec completed (branch="renovate/gradle-8.x")
{
  "durationMs": 8002
  "stdout": "[10:50:18.078] INFO (62): Installing tool java@17.0.11+9...\nopenjdk version \"17.0.11\" 2024-04-16\nOpenJDK Runtime Environment Temurin-17.0.11+9 (build 17.0.11+9)\nOpenJDK 64-Bit Server VM Temurin-17.0.11+9 (build 17.0.11+9, mixed mode, sharing)\n[10:50:25.190] INFO (62): Installed tool java in 7.1s.\n"
  "stderr": ""
}

DEBUG: Executing command (branch="renovate/gradle-8.x")
{
  "command": "./gradlew :wrapper --gradle-distribution-url https://services.gradle.org/distributions/gradle-8.9-bin.zip --gradle-distribution-sha256-sum d725d707bfabd4dfdc958c624003b3c80accc03f7037b5122c4b1d0ef15cecab"
}

DEBUG: rawExec err (branch="renovate/gradle-8.x")
{
  "err": {
    "cmd": "/bin/sh -c ./gradlew :wrapper --gradle-distribution-url https://services.gradle.org/distributions/gradle-8.9-bin.zip --gradle-distribution-sha256-sum d725d707bfabd4dfdc958c624003b3c80accc03f7037b5122c4b1d0ef15cecab",
    "stderr": "\nFAILURE: Build failed with an exception.\n\n* What went wrong:\nCannot find a Java installation on your machine (Linux 5.15.0-1058-aws amd64) matching the Daemon JVM defined requirements: Compatible with Java 21 (from gradle/gradle-daemon-jvm.properties).\n\n* Try:\n> Run with --stacktrace option to get the stack trace.\n> Run with --info or --debug option to get more log output.\n> Run with --scan to get full insights.\n> Get more help at https://help.gradle.org.\n",```

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