[Output Text file has extra blank lines.]

I don't think font-size makes any difference, I was just experimenting.. So it can be ignored.
The content of tranLine are preformatted with exact spaces as that is the requirement.. 
 

[Output Text file has extra blank lines.]

I am posting my detail Section, which has only 1 field. When an output file is created every line has an extra blank line... The content of field 'tranLine' are shorter than the width. 

    <detail>
        <band height="20" isSplitAllowed="false">
            <textField isBlankWhenNull="true">
                <reportElement x="0" y="0" width="1250" height="20" isRemoveLineWhenBlank="true"/>
                <textElement>
                    <font size="14"/>
                </textElement>
                <textFieldExpression class="java.lang.String"><![CDATA[$F{tranLine}]]></textFieldExpression>
            </textField>
        </band>
    </detail>
Here is my output... 

TEST171018TESTTEST000300      TXT DATA      USD           1,000,000.00     RXMXRXS - ,20171024:00590                              
                                                                                                                                  
TEXT171020TEXTTEXT002700      TXT DATA      USD              20,000.00     RXMXRXS - ,20171024:00470