[jboss-jira] [JBoss JIRA] (WFLY-2900) Performance issue with Xalan transformer and very large character data nodes

[Kyle Lape (JIRA)]

Kyle Lape created WFLY-2900:
-------------------------------

             Summary: Performance issue with Xalan transformer and very large character data nodes
                 Key: WFLY-2900
                 URL: https://issues.jboss.org/browse/WFLY-2900
             Project: WildFly
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: XML Frameworks
            Reporter: Kyle Lape
            Assignee: Jason Greene


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.

Code to reproduce:

{code:java}
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);
{code}

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