Michael Drogalis created KAFKA-8296:
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Summary: Kafka Streams branch method raises type warnings
Key: KAFKA-8296
URL: https://issues.apache.org/jira/browse/KAFKA-8296
Project: Kafka
Issue Type: Bug
Components: streams
Reporter: Michael Drogalis
Because the branch method in the DSL takes vargargs, using it as follows raises
an unchecked type warning:
{code:java}
KStream<String, User>[] branches = builder.<String,
User>stream(inputTopic)
.branch((key, user) -> "united
states".equals(user.getCountry()),
(key, user) -> "germany".equals(user.getCountry()),
(key, user) -> "mexico".equals(user.getCountry()),
(key, user) -> true);
{code}
The compiler warns with:
{code:java}
Warning:(39, 24) java: unchecked generic array creation for varargs parameter
of type org.apache.kafka.streams.kstream.Predicate<? super java.lang.String,?
super io.confluent.developer.avro.User>[]
{code}
This is unfortunate because of the way Java's type system + generics work. We
could possibly fix this by adding the @SafeVarargs annotation to the branch
method signatures.
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