It has been observed that when using the Transfomer to convert a StreamSource to
DOMResult, the performance of Transform gets worse as the size of the
inputstream increases.

How to Reproduce :

The issue manifests in the form of Poor performance of SAAJ for Large Payloads.
SAAJ RI depends on the Transformer.

 import javax.xml.soap.*;

       long start = System.currentTimeMillis();
       MessageFactory mf =
MessageFactory.newInstance(SOAPConstants.SOAP_1_2_PROTOCOL);
       MimeHeaders hdrs = new MimeHeaders();
       hdrs.addHeader("Content-Type", "application/soap+xml");
       SOAPMessage sm = mf.createMessage(hdrs, new FileInputStream(new
File("msgAttach.xml")));
       SOAPBody body = sm.getSOAPBody();
       long end = System.currentTimeMillis();
       System.out.println("Total Time Taken=" + (end - start)/1000);

Here msgAttach.xml is basically a SOAP Envelope with a large SOAPBody

------------
Profiling has shown that 99.5% of the time is being spent on in
CharacterDataImpl.appendData()

com.sun.org. customer .xalan.internal.xsltc.trax.SAX2DOM.characters(char[], int,
int)  is calling
com.sun.org. customer .xerces.internal.dom.CharacterDataImpl.appendData(String)  and
99.5% of time is spent here.
Posted Date : 2008-01-18 19:23:14.0

N/A

As shown in the profiling analysis, SAX2DOM makes calls on CharacterDataImpl.appendData(String) to accumulate text. This is very inefficient since a node is created as a string, every call to appendData results in a string concatenation. The fix is to use a StringBuffer to accumulate text before the node is created using the resulting string.

Simple test on a workstation (Sun Ultra 20) shows a transformation of the provided xml file (436kb) from StreamSource to DOMResult which took over 13 min. before now takes only 172ms after the change.
Posted Date : 2008-01-18 20:29:12.0

The customer has confirmed that the patch fixed the performance problem they had. This patch has also provided a performance improvement for xml transformation. The fix in jaxp 1.4 will also be integrated into future jdk5/6 update releases.
Posted Date : 2008-02-27 23:10:32.0

We have issues with this at several clients. SOAP invocations get exponentially slower depending on size. When will this bug be implemented ?