public Service withAccountId(String accountId) {
        setAccountId(accountId);
        return this;
    }
<p>
Identifier of the Amazon Web Services account in which the service runs.
</p>

@param accountId
       Identifier of the Amazon Web Services account in which the service runs.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-xray/src/main/java/com/amazonaws/services/xray/model/Service.java