[BUG] java.lang.NoClassDefFoundError: reactor/util/context/ContextView

[bvenkatbm]

Describe the bug
Migrating from azure-messaging-eventhubs from azure-eventhubs and azure-eventhubs-eph as the libraries are deprecated. Following the migration guide, https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/eventhubs/azure-messaging-eventhubs/migration-guide.md facing the following issue. It is seen that updated libraries use https://projectreactor.io/.

Exception or Stack Trace

at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:322)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:190)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:153)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361)
	at org.springframework.boot.context.event.EventPublishingRunListener.running(EventPublishingRunListener.java:108)
	at org.springframework.boot.SpringApplicationRunListeners.running(SpringApplicationRunListeners.java:77)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
	at com.toshiba.hub4.IngestionService.main(IngestionService.java:58)
Caused by: java.lang.NoClassDefFoundError: reactor/util/context/ContextView
	at com.azure.storage.blob.implementation.ServicesImpl.<init>(ServicesImpl.java:62)
	at com.azure.storage.blob.implementation.AzureBlobStorageImpl.<init>(AzureBlobStorageImpl.java:216)
	at com.azure.storage.blob.implementation.AzureBlobStorageBuilder.build(AzureBlobStorageBuilder.java:93)
	at com.azure.storage.blob.BlobContainerAsyncClient.<init>(BlobContainerAsyncClient.java:130)
	at com.azure.storage.blob.BlobContainerClientBuilder.buildAsyncClient(BlobContainerClientBuilder.java:132)
	at com.toshiba.hub4.azure.EPHConfig.startIngestionEventProcessorClient(EPHConfig.java:105)
	at com.toshiba.hub4.azure.EPHConfig.run(EPHConfig.java:92)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:305)
	... 13 common frames omitted
Caused by: java.lang.ClassNotFoundException: reactor.util.context.ContextView
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	... 25 common frames omitted

To Reproduce
Using

1. spring-boot: 2.3.4.RELEASE
2. spring-cloud: Hoxton.SR8

Code Snippet
On trying to initialize Async blob client

BlobContainerAsyncClient blobContainerAsyncClient = new BlobContainerClientBuilder()
					.connectionString(storageConnectionString)
					.containerName(storageContainerName)
					.buildAsyncClient();

Expected behavior
Blob client should be initialized.

Setup (please complete the following information):

• OS: Windows
• IDE : IntelliJ
• Version: azure-messaging-eventhubs: 5.6.0, azure-messaging-eventhubs-checkpointstore-blob: 1.5.1

Information Checklist
Kindly make sure that you have added all the following information above and checkoff the required fields otherwise we will treat the issuer as an incomplete report

• Bug Description Added
• Repro Steps Added
• Setup information Added

[bvenkatbm]

probably an duplicate of #20391

[chenrujun]

spring-boot: 2.3.4.RELEASE managed reactor-core version: 3.3.10.
Refs:

1. https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-dependencies/2.3.4.RELEASE/spring-boot-dependencies-2.3.4.RELEASE.pom
2. https://repo1.maven.org/maven2/io/projectreactor/reactor-bom/Dysprosium-SR12/reactor-bom-Dysprosium-SR12.pom

azure-messaging-eventhubs required reactor-core version: 3.4.3.
Refs:

1. https://github.com/Azure/azure-sdk-for-java/blob/azure-messaging-eventhubs_5.6.0/eng/versioning/external_dependencies.txt#L62

---

My suggestion:
Add following content in pom.xml:

    <dependency>
      <groupId>io.projectreactor</groupId>
      <artifactId>reactor-core</artifactId>
      <version>3.4.3</version>
    </dependency>

If problem still exists after you added the content, please share your pom.xml.

[chenrujun]

Closing this issue because there is not response for a long time.