sijie commented on issue #5136: Java Function cannot work with any JSON parser JAR URL: https://github.com/apache/pulsar/issues/5136#issuecomment-532515588 the original `AddWindowFunction` example is `Function <Collection<Integer>, Integer>`. If you run this function before, the input topic and output topic will be Schema.Integer. You can't change the schema type. So I would suggest double-check if you are submitting the right function to Pulsar.
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