When running the code snippet at the bottom, a failure occurs inside the CompositeException. The underlying cause of the failure is
Caused by: java.lang.RuntimeException: Duplicate found in causal chain so cropping to prevent loop ...
It would seem that the instance of CompositeException is being reused by each invocation of flatMap which is why it is seeing the same exception twice.
The expected behaviour is that first element emitted from the flux will be transformed into an error signal, causing the remaining elements to be cancelled and a Flux with an error signal being propagated down the signal chain.
Flux.just(1, 2, 3)
.flatMap(i -> RxReactiveStreams.toPublisher(Observable.error(new NullPointerException())))
.subscribe();
Can anyone explain why this behaviour is occurring and what can be done to mitigate it?
RxJava Version: 1.3.8
Full stack trace
rx.exceptions.OnErrorFailedException: Error occurred when trying to propagate error to Observer.onError
at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:187)
at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:115)
at rx.internal.operators.OperatorSerialize$1.onError(OperatorSerialize.java:52)
at rx.observers.SerializedObserver.onError(SerializedObserver.java:152)
at rx.observers.SerializedSubscriber.onError(SerializedSubscriber.java:78)
at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44)
at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.subscribe(Observable.java:10423)
at rx.Observable.subscribe(Observable.java:10390)
at rx.internal.reactivestreams.PublisherAdapter.subscribe(PublisherAdapter.java:35)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.onNext(FluxFlatMap.java:418)
at reactor.core.publisher.FluxArray$ArraySubscription.slowPath(FluxArray.java:126)
at reactor.core.publisher.FluxArray$ArraySubscription.request(FluxArray.java:99)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.onSubscribe(FluxFlatMap.java:363)
at reactor.core.publisher.FluxArray.subscribe(FluxArray.java:53)
at reactor.core.publisher.FluxArray.subscribe(FluxArray.java:59)
at reactor.core.publisher.Flux.subscribe(Flux.java:8264)
at reactor.core.publisher.Flux.subscribeWith(Flux.java:8428)
at reactor.core.publisher.Flux.subscribe(Flux.java:8235)
at reactor.core.publisher.Flux.subscribe(Flux.java:8162)
at reactor.core.publisher.Flux.subscribe(Flux.java:8080)
at uk.sky.ovp.mvpdb.service.service.strategy.common.executors.DownstreamExecutorIntegrationTest.nam2e(DownstreamExecutorIntegrationTest.java:76)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:675)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:117)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:184)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:180)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:127)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: rx.exceptions.CompositeException: 2 exceptions occurred.
... 75 more
Caused by: rx.exceptions.CompositeException$CompositeExceptionCausalChain: Chain of Causes for CompositeException In Order Received =>
at rx.exceptions.CompositeException.getCause(CompositeException.java:129)
at java.base/java.lang.Throwable.printEnclosedStackTrace(Throwable.java:711)
at java.base/java.lang.Throwable.printStackTrace(Throwable.java:671)
at java.base/java.lang.Throwable.printStackTrace(Throwable.java:725)
at com.intellij.junit5.JUnit5TestExecutionListener.getTrace(JUnit5TestExecutionListener.java:304)
at com.intellij.junit5.JUnit5TestExecutionListener.testFailure(JUnit5TestExecutionListener.java:289)
at com.intellij.junit5.JUnit5TestExecutionListener.testFailure(JUnit5TestExecutionListener.java:245)
at com.intellij.junit5.JUnit5TestExecutionListener.executionFinished(JUnit5TestExecutionListener.java:183)
at com.intellij.junit5.JUnit5TestExecutionListener.executionFinished(JUnit5TestExecutionListener.java:171)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry$CompositeTestExecutionListener.lambda$executionFinished$10(TestExecutionListenerRegistry.java:109)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry.lambda$notifyEach$1(TestExecutionListenerRegistry.java:67)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry.notifyEach(TestExecutionListenerRegistry.java:65)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry.access$200(TestExecutionListenerRegistry.java:32)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry$CompositeTestExecutionListener.executionFinished(TestExecutionListenerRegistry.java:108)
at org.junit.platform.launcher.core.ExecutionListenerAdapter.executionFinished(ExecutionListenerAdapter.java:56)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.reportCompletion(NodeTestTask.java:179)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:85)
... 32 more
Caused by: java.lang.NullPointerException
at uk.sky.ovp.mvpdb.service.service.strategy.common.executors.DownstreamExecutorIntegrationTest.lambda$nam2e$1(DownstreamExecutorIntegrationTest.java:75)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.onNext(FluxFlatMap.java:378)
at reactor.core.publisher.FluxArray$ArraySubscription.slowPath(FluxArray.java:126)
at reactor.core.publisher.FluxArray$ArraySubscription.request(FluxArray.java:99)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.onSubscribe(FluxFlatMap.java:363)
at reactor.core.publisher.FluxArray.subscribe(FluxArray.java:53)
at reactor.core.publisher.FluxArray.subscribe(FluxArray.java:59)
at reactor.core.publisher.Flux.subscribe(Flux.java:8264)
at reactor.core.publisher.Flux.subscribeWith(Flux.java:8428)
at reactor.core.publisher.Flux.subscribe(Flux.java:8235)
at reactor.core.publisher.Flux.subscribe(Flux.java:8162)
at reactor.core.publisher.Flux.subscribe(Flux.java:8080)
at uk.sky.ovp.mvpdb.service.service.strategy.common.executors.DownstreamExecutorIntegrationTest.nam2e(DownstreamExecutorIntegrationTest.java:76)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:675)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:117)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:184)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:180)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:127)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
... 32 more
Caused by: java.lang.RuntimeException: Duplicate found in causal chain so cropping to prevent loop ...
at rx.exceptions.CompositeException.getCause(CompositeException.java:145)
at java.base/java.lang.Throwable.printEnclosedStackTrace(Throwable.java:711)
at java.base/java.lang.Throwable.printStackTrace(Throwable.java:671)
at java.base/java.lang.Throwable.printStackTrace(Throwable.java:725)
at com.intellij.junit5.JUnit5TestExecutionListener.getTrace(JUnit5TestExecutionListener.java:304)
at com.intellij.junit5.JUnit5TestExecutionListener.testFailure(JUnit5TestExecutionListener.java:289)
at com.intellij.junit5.JUnit5TestExecutionListener.testFailure(JUnit5TestExecutionListener.java:245)
at com.intellij.junit5.JUnit5TestExecutionListener.executionFinished(JUnit5TestExecutionListener.java:183)
at com.intellij.junit5.JUnit5TestExecutionListener.executionFinished(JUnit5TestExecutionListener.java:171)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry$CompositeTestExecutionListener.lambda$executionFinished$10(TestExecutionListenerRegistry.java:109)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry.lambda$notifyEach$1(TestExecutionListenerRegistry.java:67)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry.notifyEach(TestExecutionListenerRegistry.java:65)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry.access$200(TestExecutionListenerRegistry.java:32)
at org.junit.platform.launcher.core.TestExecutionListenerRegistry$CompositeTestExecutionListener.executionFinished(TestExecutionListenerRegistry.java:108)
at org.junit.platform.launcher.core.ExecutionListenerAdapter.executionFinished(ExecutionListenerAdapter.java:56)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.reportCompletion(NodeTestTask.java:179)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:85)
... 32 more
