public void setGuardrailPolicyArns(java.util.Collection<String> guardrailPolicyArns) {
        if (guardrailPolicyArns == null) {
            this.guardrailPolicyArns = null;
            return;
        }

        this.guardrailPolicyArns = new java.util.ArrayList<String>(guardrailPolicyArns);
    }
The list of IAM policy ARNs that are applied as channel guardrails. The AWS managed 'AdministratorAccess' policy
is applied by default if this is not set.

@param guardrailPolicyArns
       The list of IAM policy ARNs that are applied as channel guardrails. The AWS managed 'AdministratorAccess'
       policy is applied by default if this is not set.
aws-java-sdk-chatbot/src/main/java/com/amazonaws/services/chatbot/model/TeamsChannelConfiguration.java