Performance issue with Xalan transformer and very large text nodes

Code to reproduce: import java.io.ByteArrayInputStream; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.dom.DOMResult; import javax.xml.transform.stream.StreamSource; StringBuilder sb = new StringBuilder(); sb.append( "<thing>" ); while (sb.length() < 50*1024*1024) { //50MB sb.append( "iunfgq0irg02i4t985023gwhj9eroisghvpoweisvdj" ); //random blob } sb.append( "</thing>" ); TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer transformer = tFactory.newTransformer(); ByteArrayInputStream bais = new ByteArrayInputStream(sb.toString().getBytes()); StreamSource source = new StreamSource(bais); DOMResult result = new DOMResult(); transformer.transform(source, result);

<para>It was observed that when using the <code>Transfomer</code> to convert a <code>StreamSource</code> to <code>DOMResult</code>, the performance of the Transform was worse as the size of the character data increased. For example, if you had a 50MB XML BLOB, this would take a very long time to finish. This issue has been resolved in this release by adjusting both the <code>SAX2DOM</code> and <code>DOMBuilder</code> classes to more efficiently handle larger inputs.</para>