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=str #16608 adds section in readme explaining null is illegal

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Konrad Malawski 2015-04-15 17:47:09 +02:00
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akka-docs-dev/rst/java/stream-flows-and-basics.rst
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@ -104,6 +104,11 @@ There are various ways to wire up different parts of a stream, the following exa
.. includecode:: ../../../akka-samples/akka-docs-java-lambda/src/test/java/docs/stream/FlowDocTest.java#flow-connecting
Illegal stream elements
^^^^^^^^^^^^^^^^^^^^^^^
In accordance to the Reactive Streams specification (`Rule 2.13 <https://github.com/reactive-streams/reactive-streams-jvm#2.13>`_)
Akka Streams do not allow ``null`` to be passed through the stream as an element. In case you want to model the concept
of absence of a value we recommend using ``akka.japi.Option`` (for Java 6 and 7) or ``java.util.Optional`` which is available since Java 8.
.. _back-pressure-explained-java: