in src/main/java/software/amazon/encryption/s3/S3EncryptionClient.java [684:697]
private boolean onlyOneNonNull(Object... values) {
boolean haveOneNonNull = false;
for (Object o : values) {
if (o != null) {
if (haveOneNonNull) {
return false;
}
haveOneNonNull = true;
}
}
return haveOneNonNull;
}