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Add JVM --add-opens flags for Flink PVR on Java 21#39303

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Abacn merged 1 commit into
apache:masterfrom
aIbrahiim:fix-java21-flink-jvm-args
Jul 13, 2026
Merged

Add JVM --add-opens flags for Flink PVR on Java 21#39303
Abacn merged 1 commit into
apache:masterfrom
aIbrahiim:fix-java21-flink-jvm-args

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@aIbrahiim

@aIbrahiim aIbrahiim commented Jul 13, 2026

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Fixes: #39264

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aIbrahiim marked this pull request as ready for review July 13, 2026 12:04
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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces configuration changes to ensure compatibility with Java 21 for Flink Portable Runner (PVR) tests. By dynamically adding required JVM module-opening flags and security manager settings, it resolves runtime issues encountered when executing these tests on newer Java versions.

Highlights

  • JVM Compatibility: Added necessary --add-opens flags and security manager configuration to support running Flink PVR on Java 21.
  • Gradle Configuration: Updated flink_job_server.gradle to dynamically inject JVM arguments into portable runner tasks based on the detected Java version.
  • Script Integration: Modified the flinkJobServerSetup task to pass the required JVM arguments to the job server startup script.
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Code Review

This pull request configures JVM arguments (such as --add-opens and security manager permissions) for Flink Job Server tasks when running on Java 17 or higher, and updates the setup task to pass these arguments. The review feedback suggests using Gradle's built-in JavaVersion.toVersion() helper for a more robust Java version check, and using the standard jvmArgs(...) method instead of the += operator to safely append JVM arguments to tasks.

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Comment on lines +243 to +244
def testJavaVer = project.findProperty('testJavaVersion') ? (project.property('testJavaVersion') as int) : JavaVersion.current().majorVersion.toInteger()
if (testJavaVer >= 17) {

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medium

Instead of manually parsing the Java version string to an integer (which can be fragile depending on the format of testJavaVersion), you can use Gradle's built-in JavaVersion.toVersion() helper. This is much more robust and idiomatic.

  def javaVersion = JavaVersion.toVersion(project.findProperty('testJavaVersion') ?: JavaVersion.current())
  if (javaVersion.isJava17Compatible()) {


[validatesPortableRunnerDocker, validatesPortableRunnerBatchDataSet, validatesPortableRunnerBatch, validatesPortableRunnerStreaming, validatesPortableRunnerStreamingCheckpoint].each { task ->
task.configure {
jvmArgs += flinkJobServerJvmArgs()

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medium

Using jvmArgs(...) is the standard and safer Gradle DSL method to append JVM arguments to a task, rather than using the += operator which can fail if jvmArgs is not pre-initialized.

    jvmArgs(flinkJobServerJvmArgs())

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R: @Abacn

Would you mind taking a look here?

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@Abacn
Abacn merged commit f20fca2 into apache:master Jul 13, 2026
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The PostCommit Java PVR Flink Streaming job is flaky

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