samples: fixed automl cancel operation bug

[munkhuushmgl]

Fixes #3184

[lesv]

@munkhuushmgl PTAL

Java 11

------------------------------------------------------------
- testing automl/beta
------------------------------------------------------------
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 1.24 s <<< FAILURE! - in com.example.automl.CancelOperationTest
[ERROR] com.example.automl.CancelOperationTest.testGetOperationStatus  Time elapsed: 1.238 s  <<< ERROR!
com.google.api.gax.rpc.FailedPreconditionException: io.grpc.StatusRuntimeException: FAILED_PRECONDITION: Operation projects/233822521623/locations/us-central1/operations/TRL7020674763198562304 is still running and cannot be deleted. Please cancel the operation before deletion.
	at com.google.api.gax.rpc.ApiExceptionFactory.createException(ApiExceptionFactory.java:59)
	at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:72)
	at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:60)
	at com.google.api.gax.grpc.GrpcExceptionCallable$ExceptionTransformingFuture.onFailure(GrpcExceptionCallable.java:97)
	at com.google.api.core.ApiFutures$1.onFailure(ApiFutures.java:68)
	at com.google.common.util.concurrent.Futures$CallbackListener.run(Futures.java:1050)
	at com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30)
	at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:1176)
	at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:969)
	at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:760)
	at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:526)
	at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:501)
	at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:426)
	at io.grpc.internal.ClientCallImpl.access$500(ClientCallImpl.java:66)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:689)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$900(ClientCallImpl.java:577)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:751)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:740)
	at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
	at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
	Suppressed: com.google.api.gax.rpc.AsyncTaskException: Asynchronous task failed
		at com.google.api.gax.rpc.ApiExceptions.callAndTranslateApiException(ApiExceptions.java:57)
		at com.google.api.gax.rpc.UnaryCallable.call(UnaryCallable.java:112)
		at com.google.longrunning.OperationsClient.deleteOperation(OperationsClient.java:495)
		at com.google.longrunning.OperationsClient.deleteOperation(OperationsClient.java:470)
		at com.example.automl.CancelOperationTest.tearDown(CancelOperationTest.java:97)
		at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
		at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
		at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.base/java.lang.reflect.Method.invoke(Method.java:566)
		at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
		at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
		at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
		at org.junit.internal.runners.statements.RunAfters.invokeMethod(RunAfters.java:46)
		at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
		at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
		at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
		at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
		at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
		at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
		at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
		at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
		at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
		at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
		at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
		at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
		at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
		at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
		at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
		at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
		at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
		at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
		at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:377)
		at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:138)
		at org.apache.maven.surefire.booter.ForkedBooter.run(ForkedBooter.java:465)
		at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:451)
Caused by: io.grpc.StatusRuntimeException: FAILED_PRECONDITION: Operation projects/233822521623/locations/us-central1/operations/TRL7020674763198562304 is still running and cannot be deleted. Please cancel the operation before deletion.
	at io.grpc.Status.asRuntimeException(Status.java:533)
	... 15 more

[ERROR] Errors:
[ERROR]   CancelOperationTest.testGetOperationStatus » FailedPrecondition io.grpc.Status...
[ERROR] Tests run: 22, Failures: 0, Errors: 1, Skipped: 0

[lesv]

Lint

#
# automl/beta
#

[ERROR] src/test/java/com/example/automl/CancelOperationTest.java:[98,7] (whitespace) WhitespaceAround: WhitespaceAround: 'while' is not followed by whitespace. Empty blocks may only be represented as {} when not part of a multi-block statement (4.1.3)
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:3.1.1:check (default-cli) on project automl-google-cloud-samples: You have 1 Checkstyle violation. -> [Help 1]