steveniemitz edited a comment on issue #11154: [BEAM-1819] Key should be available in @OnTimer methods URL: https://github.com/apache/beam/pull/11154#issuecomment-601243984 seems like this is broken/unsupported in dataflow: ``` java.lang.ClassCastException: java.lang.String cannot be cast to WindowedKey CombinerDoFn$OnTimerInvoker$t$dA.invokeOnTimer(Unknown Source) org.apache.beam.sdk.transforms.reflect.ByteBuddyDoFnInvokerFactory$DoFnInvokerBase.invokeOnTimer(ByteBuddyDoFnInvokerFactory.java:229) org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner.onTimer(SimpleDoFnRunner.java:221) org.apache.beam.runners.dataflow.worker.SimpleParDoFn.processUserTimer(SimpleParDoFn.java:373) org.apache.beam.runners.dataflow.worker.SimpleParDoFn.access$600(SimpleParDoFn.java:74) org.apache.beam.runners.dataflow.worker.SimpleParDoFn$TimerType$1.processTimer(SimpleParDoFn.java:458) org.apache.beam.runners.dataflow.worker.SimpleParDoFn.processTimers(SimpleParDoFn.java:487) org.apache.beam.runners.dataflow.worker.SimpleParDoFn.processTimers(SimpleParDoFn.java:365) org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoOperation.finish(ParDoOperation.java:52) org.apache.beam.runners.dataflow.worker.util.common.worker.MapTaskExecutor.execute(MapTaskExecutor.java:85) ``` (the generic parameter for my key isn't a string either). I'm using a build of the dataflow worker jar from this branch as well, not the one bundled w/ the docker image. edit: ah, I see [here](runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFn.java) you're just passing an empty string in for the key.
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