tvalentyn commented on PR #35647:
URL: https://github.com/apache/beam/pull/35647#issuecomment-3113335491
(the fix was to spit the processing and logging into two statements, since
logging doesn't return an element)
```
PCollection<String> processed = main.apply("WaitOnSignal",
Wait.on(signal))
.apply("ProcessAfterWait",
MapElements.into(TypeDescriptors.strings())
.via(item -> "Processed: " + item));
processed.apply("LogResults", ParDo.of(new DoFn<String, Void>() {
@ProcessElement
public void processElement(ProcessContext c) {
System.out.println(c.element());
}
}));
```
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