{"action":"created","comment":{"url":"https://api.github.com/repos/akka/akka/pulls/comments/29222601","id":29222601,"diff_hunk":"@@ -7,6 +7,8 @@\n \n import java.io.File;\n import java.io.IOException;\n+import 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this needed? `Long` is `java.lang.Long` in .java code, as far as I know","created_at":"2015-04-28T08:25:58Z","updated_at":"2015-04-28T08:25:58Z","html_url":"https://github.com/akka/akka/pull/17312#discussion_r29222601","pull_request_url":"https://api.github.com/repos/akka/akka/pulls/17312","_links":{"self":{"href":"https://api.github.com/repos/akka/akka/pulls/comments/29222601"},"html":{"href":"https://github.com/akka/akka/pull/17312#discussion_r29222601"},"pull_request":{"href":"https://api.github.com/repos/akka/akka/pulls/17312"}}},"pull_request":{"url":"https://api.github.com/repos/akka/akka/pulls/17312","id":34073586,"html_url":"https://github.com/akka/akka/pull/17312","diff_url":"https://github.com/akka/akka/pull/17312.diff","patch_url":"https://github.com/akka/akka/pull/17312.patch","issue_url":"https://api.github.com/repos/akka/akka/issues/17312","number":17312,"state":"open","locked":false,"title":"=str IO stream sink/source materialized value must be boxed explicitly","user":{"login":"ktoso","id":120979,"avatar_url":"https://avatars.githubusercontent.com/u/120979?v=3","gravatar_id":"","url":"https://api.github.com/users/ktoso","html_url":"https://github.com/ktoso","followers_url":"https://api.github.com/users/ktoso/followers","following_url":"https://api.github.com/users/ktoso/following{/other_user}","gists_url":"https://api.github.com/users/ktoso/gists{/gist_id}","starred_url":"https://api.github.com/users/ktoso/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ktoso/subscriptions","organizations_url":"https://api.github.com/users/ktoso/orgs","repos_url":"https://api.github.com/users/ktoso/repos","events_url":"https://api.github.com/users/ktoso/events{/privacy}","received_events_url":"https://api.github.com/users/ktoso/received_events","type":"User","site_admin":false},"body":"This fixes type signatures for Java. \r\nWithout it one has to explicitly cast or would get:\r\n\r\n```\r\n[error] /Users/ktoso/code/akka/akka-stream/src/main/scala/akka/stream/io/Exma.java:14: incompatible types\r\n[error] found   : akka.stream.javadsl.Sink<akka.util.ByteString,scala.concurrent.Future<java.lang.Object>>\r\n[error] required: akka.stream.javadsl.Sink<akka.util.ByteString,scala.concurrent.Future<java.lang.Long>>\r\n[error]         Sink<ByteString, Future<Long>> byteStringFutureSink = SynchronousFileSink.create(new File(\"\"));\r\n[error]                                                                                         ^\r\n[error] 1 error\r\n```\r\n\r\nIt's really weird that scalac did not right away insert `java.lang.Long` in 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