GCP Secret Manager issue in accessing secrets

Trying to access secrets from secret manager connecting from Local STS to GCP while creating client using SecretManagerServiceClient.create() I am getting NullPointerException. I have created service-account and given neccessary permissions to access and used service-account keys in for auth with env variable GOOOGLE_APPLICATION_CREDENTIALS, Please help.

public String getSecrets(String projectId, String secretId) {
    SecretManagerServiceClient smClient;
    Secret secret = null;
    String replication = "";
    try {
        System.out.printf("hello world", SecretManagerServiceClient.create()); // null printing
        smClient = SecretManagerServiceClient.create();
        System.out.printf("good evening", smClient);
        SecretName secretName = SecretName.of(projectId, secretId);
        secret = smClient.getSecret(secretName);
        if (secret.getReplication().getAutomatic() != null) {
            replication = "AUTOMATIC";
        } else if (secret.getReplication().getUserManaged() != null) {
            replication = "MANAGED";
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    System.out.printf("Secret is ", secret.getName(), replication);
    return secret.getName();
}