Value null at 'roleArn' failed to satisfy constraint: Member must not be null Service: AWSSecurityTokenService

I have the following Java code which I use to create to aws s3 bucket:

AssumeRoleRequest assumeRequest = new AssumeRoleRequest().withRoleArn(awsArn);
    AWSSecurityTokenService stsClient = AWSSecurityTokenServiceClientBuilder.standard()
        .withCredentials(new AWSStaticCredentialsProvider(new AWSCredentials......)).build();
    AssumeRoleResult assumeResult = stsClient.assumeRole(assumeRequest);

During boot time I get error:

2024-05-24T17:32:15.874Z ERROR 13528 --- [platform] [   scheduling-1] o.s.s.s.TaskUtils$LoggingErrorHandler    : Unexpected error occurred in scheduled task

com.amazonaws.services.securitytoken.model.AWSSecurityTokenServiceException: 1 validation error detected: Value null at 'roleArn' failed to satisfy constraint: Member must not be null (Service: AWSSecurityTokenService; Status Code: 400; Error Code: ValidationError; Request ID: 1b112442-8c58-14bc-a741-caf9062c9441; Proxy: null)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1879) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleServiceErrorResponse(AmazonHttpClient.java:1418) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1387) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1157) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:814) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:781) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:755) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:715) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:697) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:561) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:541) ~[aws-java-sdk-core-1.12.322.jar:na]
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.doInvoke(AWSSecurityTokenServiceClient.java:1727) ~[aws-java-sdk-sts-1.12.322.jar:na]
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.invoke(AWSSecurityTokenServiceClient.java:1694) ~[aws-java-sdk-sts-1.12.322.jar:na]
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.invoke(AWSSecurityTokenServiceClient.java:1683) ~[aws-java-sdk-sts-1.12.322.jar:na]
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.executeAssumeRole(AWSSecurityTokenServiceClient.java:532) ~[aws-java-sdk-sts-1.12.322.jar:na]
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.assumeRole(AWSSecurityTokenServiceClient.java:501) ~[aws-java-sdk-sts-1.12.322.jar:na]

I created IAM account with API keys credentials and s3 bucket. But I can't find what configuration I need to make in order to fix this issue.