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fixes:#25841 Improve-error-messages-for-the-validateStateApplicableForInput-method… #25843

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Original file line number Diff line number Diff line change
Expand Up @@ -446,8 +446,8 @@ private static void validateStateApplicableForInput(PCollection<?> input) {
} catch (Coder.NonDeterministicException exc) {
throw new IllegalArgumentException(
String.format(
"%s requires a deterministic key coder in order to use state and timers",
ParDo.class.getSimpleName()));
"%s requires a deterministic key coder in order to use state and timers, the reason is:\n\t %s",
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ParDo.class.getSimpleName(), exc.getMessage()));
}
}

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