public void setRoleArn(String roleArn) {
        this.roleArn = roleArn;
    }
The ARN of the role you wish to associate with this group. The existence of the role is not validated.

@param roleArn
       The ARN of the role you wish to associate with this group. The existence of the role is not validated.
aws-java-sdk-greengrass/src/main/java/com/amazonaws/services/greengrass/model/AssociateRoleToGroupRequest.java