akka-stream compiler warnings as fatal errors (#26673)

akka-stream/src/main/scala/akka/stream/javadsl/SubSource.scala

@@ -17,6 +17,8 @@ import scala.concurrent.duration.FiniteDuration
 import java.util.Comparator
 import java.util.concurrent.CompletionStage
 
+import com.github.ghik.silencer.silent
+
 import scala.compat.java8.FutureConverters._
 import scala.reflect.ClassTag
 
@@ -663,6 +665,7 @@ class SubSource[Out, Mat](
    * `n` must be positive, and `d` must be greater than 0 seconds, otherwise
    * IllegalArgumentException is thrown.
    */
+  @silent
   def groupedWithin(n: Int, d: java.time.Duration): SubSource[java.util.List[Out @uncheckedVariance], Mat] =
     groupedWithin(n, d.asScala)
 
@@ -710,6 +713,7 @@ class SubSource[Out, Mat](
    * `maxWeight` must be positive, and `d` must be greater than 0 seconds, otherwise
    * IllegalArgumentException is thrown.
    */
+  @silent
   def groupedWeightedWithin(
       maxWeight: Long,
       costFn: function.Function[Out, java.lang.Long],
@@ -758,6 +762,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels
    */
+  @silent
   def dropWithin(d: java.time.Duration): SubSource[Out, Mat] =
     dropWithin(d.asScala)
 
@@ -874,6 +879,7 @@ class SubSource[Out, Mat](
    * @param of time to shift all messages
    * @param strategy Strategy that is used when incoming elements cannot fit inside the buffer
    */
+  @silent
   def delay(of: java.time.Duration, strategy: DelayOverflowStrategy): SubSource[Out, Mat] =
     delay(of.asScala, strategy)
 
@@ -1023,6 +1029,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels or timer fires
    */
+  @silent
   def takeWithin(d: java.time.Duration): SubSource[Out, Mat] =
     takeWithin(d.asScala)
 
@@ -1608,6 +1615,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels
    */
+  @silent
   def initialTimeout(timeout: java.time.Duration): SubSource[Out, Mat] =
     initialTimeout(timeout.asScala)
 
@@ -1640,6 +1648,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels
    */
+  @silent
   def completionTimeout(timeout: java.time.Duration): SubSource[Out, Mat] =
     completionTimeout(timeout.asScala)
 
@@ -1674,6 +1683,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels
    */
+  @silent
   def idleTimeout(timeout: java.time.Duration): SubSource[Out, Mat] =
     idleTimeout(timeout.asScala)
 
@@ -1708,6 +1718,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels
    */
+  @silent
   def backpressureTimeout(timeout: java.time.Duration): SubSource[Out, Mat] =
     backpressureTimeout(timeout.asScala)
 
@@ -1750,6 +1761,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels
    */
+  @silent
   def keepAlive(maxIdle: java.time.Duration, injectedElem: function.Creator[Out]): SubSource[Out, Mat] =
     keepAlive(maxIdle.asScala, injectedElem)
 
@@ -2113,6 +2125,7 @@ class SubSource[Out, Mat](
    *
    * '''Cancels when''' downstream cancels
    */
+  @silent
   def initialDelay(delay: java.time.Duration): SubSource[Out, Mat] =
     initialDelay(delay.asScala)