style95 opened a new issue, #5317:
URL: https://github.com/apache/openwhisk/issues/5317

   I am unsure where this regression comes from but the invoker complains about 
the `NoSuchMethodError`.
   
   ## Steps to reproduce the issue:
   
   1.  Just deploy OpenWhisk.
   2.  Invoker complains about it when it tries to warm up.
   
   ## Provide the actual results and outputs:
   
   ```
   [2022-08-26T07:52:50.738Z] [INFO] [#tid_sid_invokerHealthManager] 
[WhiskAction] write initiated on new cache entry
   Exception in thread "pool-1-thread-3" java.lang.NoSuchMethodError: 
io.grpc.internal.AbstractManagedChannelImplBuilder.<init>(Ljava/lang/String;)V
           at 
io.grpc.netty.shaded.io.grpc.netty.NettyChannelBuilder.<init>(NettyChannelBuilder.java:137)
           at 
io.grpc.netty.shaded.io.grpc.netty.NettyChannelBuilder.forTarget(NettyChannelBuilder.java:127)
           at 
akka.grpc.internal.NettyClientUtils$.createChannel(NettyClientUtils.scala:41)
           at akka.grpc.internal.ClientState.<init>(ClientState.scala:30)
           at 
org.apache.openwhisk.grpc.DefaultActivationServiceClient.<init>(ActivationServiceClient.scala:37)
           at 
org.apache.openwhisk.grpc.ActivationServiceClient$.apply(ActivationServiceClient.scala:29)
           at 
org.apache.openwhisk.core.invoker.FPCInvokerReactive.warmUpScheduler(FPCInvokerReactive.scala:412)
           at 
org.apache.openwhisk.core.invoker.FPCInvokerReactive.$anonfun$warmUp$10(FPCInvokerReactive.scala:457)
           at scala.util.Success.$anonfun$map$1(Try.scala:255)
           at scala.util.Success.map(Try.scala:213)
           at 
org.apache.openwhisk.core.invoker.FPCInvokerReactive.$anonfun$warmUp$8(FPCInvokerReactive.scala:456)
           at 
scala.collection.concurrent.TrieMap.getOrElseUpdate(TrieMap.scala:897)
           at 
org.apache.openwhisk.core.invoker.FPCInvokerReactive.$anonfun$warmUp$7(FPCInvokerReactive.scala:452)
           at 
scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:285)
           at scala.collection.Iterator.foreach(Iterator.scala:943)
           at scala.collection.Iterator.foreach$(Iterator.scala:943)
           at scala.collection.AbstractIterator.foreach(Iterator.scala:1431)
           at scala.collection.IterableLike.foreach(IterableLike.scala:74)
           at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
           at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
           at scala.collection.TraversableLike.map(TraversableLike.scala:285)
           at scala.collection.TraversableLike.map$(TraversableLike.scala:278)
           at scala.collection.AbstractTraversable.map(Traversable.scala:108)
           at 
org.apache.openwhisk.core.invoker.FPCInvokerReactive.$anonfun$warmUp$6(FPCInvokerReactive.scala:449)
           at scala.util.Success.$anonfun$map$1(Try.scala:255)
           at scala.util.Success.map(Try.scala:213)
           at scala.concurrent.Future.$anonfun$map$1(Future.scala:292)
           at scala.concurrent.impl.Promise.liftedTree1$1(Promise.scala:33)
           at 
scala.concurrent.impl.Promise.$anonfun$transform$1(Promise.scala:33)
           at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:64)
           at 
akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:56)
           at 
akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:93)
           at 
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
           at 
scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:85)
           at 
akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:93)
           at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:48)
           at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
           at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
           at java.lang.Thread.run(Thread.java:748)
   ```


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