java.lang.NoClassDefFoundError: reactor/util/context/ContextView

I am upgrading the azure sdk for java to version 12.21.1. The spring boot version is 2.1.6. I am using the following dependency in gradle : implementation 'com.azure:azure-storage-blob:12.21.1' .

I am using the following code to create BlobServiceClient :

String accountUrl = "https://" + accountName + ".blob.core.windows.net";
 StorageSharedKeyCredential sharedKeyCredential = new StorageSharedKeyCredential(accountName, accountKey);

try{
BlobServiceClient blobServiceClient = new BlobServiceClientBuilder().credential(sharedKeyCredential).endpoint(accountUrl).buildClient();
}

But it is throwing an error at runtime :

 Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: reactor/util/context/ContextView] with root cause

java.lang.ClassNotFoundException: reactor.util.context.ContextView
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) ~[na:na]
BuiltinClassLoader.java:581
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
ClassLoaders.java:178
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[na:na]
ClassLoader.java:522
    at com.azure.core.http.policy.HttpPolicyProviders.addAfterRetryPolicies(HttpPolicyProviders.java:52) ~[azure-core-1.37.0.jar:1.37.0]
HttpPolicyProviders.java:52
    at com.azure.storage.blob.implementation.util.BuilderHelper.buildPipeline(BuilderHelper.java:128) ~[azure-storage-blob-12.21.1.jar:12.21.1]
BuilderHelper.java:128
    at com.azure.storage.blob.BlobServiceClientBuilder.buildAsyncClient(BlobServiceClientBuilder.java:135) ~[azure-storage-blob-12.21.1.jar:12.21.1]
BlobServiceClientBuilder.java:135
    at com.azure.storage.blob.BlobServiceClientBuilder.buildClient(BlobServiceClientBuilder.java:114) ~[azure-storage-blob-12.21.1.jar:12.21.1]

How to resolve this?

Looks like there was some dependency conflict between spring boot version and swagger . I upgraded spring boot to 2.7.10 and swagger to openAPI. This issue was resolved after that. Thanks.