in src/main/java/software/amazon/msk/auth/iam/internals/MSKCredentialProvider.java [155:164]
protected AwsCredentialsProvider getDefaultProvider() {
return AwsCredentialsProviderChain.of(
EnvironmentVariableCredentialsProvider.create(),
SystemPropertyCredentialsProvider.create(),
WebIdentityTokenFileCredentialsProvider.builder().asyncCredentialUpdateEnabled(true).build(),
ProfileCredentialsProvider.builder().profileFile(ProfileFileSupplier.defaultSupplier()).build(),
ContainerCredentialsProvider.builder().asyncCredentialUpdateEnabled(true).build(),
InstanceProfileCredentialsProvider.builder().asyncCredentialUpdateEnabled(true).build()
);
}