How to remove whitespaces in XML attributes

Question

I have an XML document like this:

<document>
  <root>
    <field1>
      <a 
      Type="anyType">
        <b>Text</b>
      </a>
    <field1>
  </root>
</document>

I want to remove the whitespace in the XML attribute Type and the XML field a

The output should be like:

<document>
  <root>
    <field1>
      <a Type="anyType">
        <b>Text</b>
      </a>
    <field1>
  </root>
</document>

How to do this in Java?

The code to generate the XML File is below:

DOMSource domSource = new DOMSource(document);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(domSource, result);

String fileData = format(writer.toString());

// remove CR(carriage return)
fileData = fileData.replaceAll("&#[a-zA-Z0-9]{2};", "");
saveDocumentIntoFile(fileData, fileName);

method format()

public String format(String xml) {
        
        try {
            final InputSource src = new InputSource(new StringReader(xml));
            final Node document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(src).getDocumentElement();
            final Boolean keepDeclaration = Boolean.valueOf(xml.startsWith("<?xml"));
            
            final DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
            final DOMImplementationLS impl = (DOMImplementationLS) registry.getDOMImplementation("LS");
            final LSSerializer writer = impl.createLSSerializer();
            
            // Set this to true if the output needs to be beautified.
            writer.getDomConfig().setParameter("format-pretty-print", Boolean.TRUE);
            // Set this to true if the declaration is needed to be outputted.
            writer.getDomConfig().setParameter("xml-declaration", keepDeclaration);
            
            return writer.writeToString(document);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

method saveDocumentIntoFile()

protected void saveDocumentIntoFile(String fileData, String fileName) throws IOException {
        FileWriter batchFile = new FileWriter(fileName);
        
        batchFile.write(fileData);
        batchFile.close();
    }