Xavier Léauté created KAFKA-4672:
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Summary: KIP-100 api changes break Java 8 lambda expressions in
some cases
Key: KAFKA-4672
URL: https://issues.apache.org/jira/browse/KAFKA-4672
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 0.10.2.0
Reporter: Xavier Léauté
Assignee: Xavier Léauté
Fix For: 0.10.2.0
Variance changes introduced in KIP-100 cause compilation failures with lambda
expression in Java 8.
To my knowledge this only affects methods taking suppliers of functions
KStreams.transform(TransformerSupplier<...>, String...)
KStreams.transformValues(ValueTransformerSupplier<...>)
KStreams.process(ProcessorSupplier<...>)
prior to the changes it was possible to write
streams.process(MyProcessor::new)
streams.transform(MyTransformer::new)
etc.
where MyProcessor and MyTransformer extend Processor and Transformer
respectively.
After the changes the Java compiler is unable to infer correct types for the
lambda expression.
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