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[FLINK-21672][test][BP-1.20] Amend unit test so it works with IBM java (#27515) #27547

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Merged
RocMarshal merged 1 commit into from
Feb 7, 2026
Merged

[FLINK-21672][test][BP-1.20] Amend unit test so it works with IBM java (#27515) #27547

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33 changes: 27 additions & 6 deletions ...c/main/java/org/apache/flink/streaming/tests/StickyAllocationAndLocalRecoveryTestJob.java
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Original file line number Diff line number Diff line change
Expand Up @@ -413,13 +413,34 @@ private boolean isScheduledToCorrectAllocation(
private static int getJvmPid() throws Exception {
java.lang.management.RuntimeMXBean runtime =
java.lang.management.ManagementFactory.getRuntimeMXBean();
java.lang.reflect.Field jvm = runtime.getClass().getDeclaredField("jvm");
jvm.setAccessible(true);
sun.management.VMManagement mgmt = (sun.management.VMManagement) jvm.get(runtime);
java.lang.reflect.Method pidMethod = mgmt.getClass().getDeclaredMethod("getProcessId");
pidMethod.setAccessible(true);

return (int) (Integer) pidMethod.invoke(mgmt);
// Try to use reflection to access sun.management.VMManagement
// This avoids compile-time dependency on internal JDK classes
try {
java.lang.reflect.Field jvm = runtime.getClass().getDeclaredField("jvm");
jvm.setAccessible(true);
Object mgmt = jvm.get(runtime);

// Check if the class exists (it may not in some JDK distributions like IBM Semeru)
if (mgmt != null) {
java.lang.reflect.Method pidMethod =
mgmt.getClass().getDeclaredMethod("getProcessId");
pidMethod.setAccessible(true);
return (int) (Integer) pidMethod.invoke(mgmt);
}
} catch (NoSuchFieldException | NoSuchMethodException | ClassCastException e) {
// Fall through to alternative method
}

// Fallback: parse PID from RuntimeMXBean name (format: "pid@hostname")
String jvmName = runtime.getName();
int atIndex = jvmName.indexOf('@');
if (atIndex > 0) {
return Integer.parseInt(jvmName.substring(0, atIndex));
}

throw new UnsupportedOperationException(
"Unable to determine JVM PID. This JDK distribution may not support the required internal APIs.");
}

/** Records the information required to check sticky scheduling after a restart. */
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