ADDITIONAL SYSTEM INFORMATION :
Confirmed in both 11.0.3 and 12.0.1

A DESCRIPTION OF THE PROBLEM :
When formatting an XML file using javax.xml.transform.Transformer with OutputKeys.INDENT set to yes, additional whitespace is added before and after CDATA tags.

REGRESSION : Last worked in version 8u212

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Format the XML below using javax.xml.transform.Transformer with OutputKeys.INDENT set to yes

<foo><bar><![CDATA[data]]></bar></foo>

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
<foo>
  <bar><![CDATA[data]]></bar>
</foo>
ACTUAL -
<foo>
  <bar>
    <![CDATA[data]]>
  </bar>
</foo>

---------- BEGIN SOURCE ----------
    @Test
    public void test() throws TransformerException, ParserConfigurationException, IOException, SAXException
    {
        String data = "data";

        StreamSource source = new StreamSource(new StringReader("<foo><bar><![CDATA[" + data + "]]></bar></foo>"));
        StreamResult result = new StreamResult(new StringWriter());

        Transformer tform = TransformerFactory.newInstance().newTransformer();
        tform.setOutputProperty(OutputKeys.INDENT, "yes");
        tform.transform(source, result);

        String xml = result.getWriter().toString(); // This String contains the extra whitespace

        Document document = DocumentBuilderFactory.newInstance()
            .newDocumentBuilder()
            .parse(new InputSource(new StringReader(xml)));

        String resultData = document.getElementsByTagName("bar")
            .item(0)
            .getTextContent();

        assertEquals(data, resultData);

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None currently known

FREQUENCY : always