public void setFieldName(String fieldName) {
        this.fieldName = fieldName;
    }
<p>
The field name where the invalid entry was detected.
</p>

@param fieldName
       The field name where the invalid entry was detected.
aws-java-sdk-costoptimizationhub/src/main/java/com/amazonaws/services/costoptimizationhub/model/ValidationExceptionDetail.java