How to use Java Optional to convert a complex if condition

Consider the following class

Class RequestBodyResource {
    private RequestVariable1 att1;
    private String att2;
    private String att3;
}

I have a method that should return false in 2 conditions

• If all the 3 attributes of the RequestBodyResource Object is null/empty
• If more than 1 attribute is populated at the same time

The code for the same is as

public boolean validateAtleastOneRequiredRequestParam(RequestBodyResource request) {

    //The below 3 conditions are to test that only one request is present
    if(StringUtils.isNotEmpty(request.getAtt3()) && null != request.getAtt1()) {
        return false;
    }
    if(StringUtils.isNotEmpty(request.getAtt2()) && null != request.getAtt1()) {
        return false;
    }
    if(StringUtils.isNotEmpty(request.getAtt3()) && StringUtils.isNotEmpty(request.getAtt2())) {
        return false;
    }

    //The below condition is to test that at least one request is present
    if(StringUtils.isEmpty(request.getAtt3()) && null == request.getAtt1() && StringUtils.isEmpty(request.getAtt2())) {
        return false;
    }
    return true;
}

How to use Java 8 Optional to make this code much easier to write and read?