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Hai Zhou commented on FLINK-7438: --------------------------------- I think the reason for this problem is [https://issues.scala-lang.org/browse/SI-8808]. this problem: {panel:title=org.apache.flink.streaming.api.scala.WindowedStream.scala} package org.apache.flink.streaming.api.scala import org.apache.flink.util.OutputTag // permanently hidden warning here class WindowedStream { .... @PublicEvolving def sideOutputLateData(outputTag: OutputTag[T]): WindowedStream[T, K, W] = { // this OutputTag class is org.apache.flink.streaming.api.scala.OutputTag.scala javaStream.sideOutputLateData(outputTag) this } ...... } {panel} {panel:title=org.apache.flink.streaming.api.scala.OutputTag.scala} package org.apache.flink.streaming.api.scala import org.apache.flink.util.{OutputTag => JOutputTag} class OutputTag[T: TypeInformation](id: String) extends JOutputTag[T](id, implicitly[TypeInformation[T]]) object OutputTag { def apply[T: TypeInformation](id: String): OutputTag[T] = new OutputTag(id) } {panel} > Some classes are eclipsed by classes in package scala > ----------------------------------------------------- > > Key: FLINK-7438 > URL: https://issues.apache.org/jira/browse/FLINK-7438 > Project: Flink > Issue Type: Bug > Components: Build System, DataStream API > Reporter: Ted Yu > Priority: Minor > > Noticed the following during compilation: > {code} > [WARNING] > /flink/flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/WindowedStream.scala:33: > warning: imported `OutputTag' is permanently hidden by definition of > object OutputTag in package scala > [WARNING] import org.apache.flink.util.{Collector, OutputTag} > [WARNING] ^ > [WARNING] > /flink/flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/WindowedStream.scala:33: > warning: imported `OutputTag' is permanently hidden by definition of > class OutputTag in package scala > [WARNING] import org.apache.flink.util.{Collector, OutputTag} > {code} > We should avoid the warning e.r.t. OutputTag. > There may be other occurrences of similar warning. -- This message was sent by Atlassian JIRA (v6.4.14#64029)