Random errors in XML-XSL transformation in tomcat web app

Im getting this error randomly in the web application which does the XML-XSL transformation. Same data when reloaded exception does not occur.

----------error 1

Caused by: java.lang.ArrayIndexOutOfBoundsException: 7 >= 7  
at java.util.Vector.elementAt(Vector.java:427)  
at gnu.xml.aelfred2.SAXDriver.startElement(SAXDriver.java:804)  
at gnu.xml.aelfred2.XmlParser.parseElement(XmlParser.java:1037)  
at gnu.xml.aelfred2.XmlParser.parseDocument(XmlParser.java:416)  
at gnu.xml.aelfred2.XmlParser.doParse(XmlParser.java:167)  
at gnu.xml.aelfred2.SAXDriver.parse(SAXDriver.java:320)  
at gnu.xml.aelfred2.XmlReader.parse(XmlReader.java:294)  
at org.apache.xml.dtm.ref.DTMManagerDefault.getDTM(DTMManagerDefault.java:437)  
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:699)  
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1284)  
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1262)  
at org.apache.taglibs.xtags.xslt.StyleTag.doEndTag(StyleTag.java:157)  
at org.开发者_Python百科apache.jsp.jsp.chart.newleafmodel.tabdetail_jsp._jspService(tabdetail_jsp.java:698)  
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)  
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)  

-----------------------------------error 2

Caused by: java.lang.ArrayIndexOutOfBoundsException: 5 >= 5  
at java.util.Vector.elementAt(Vector.java:427)  
at gnu.xml.aelfred2.SAXDriver.startElement(SAXDriver.java:804)  
at gnu.xml.aelfred2.XmlParser.parseElement(XmlParser.java:1037)  
at gnu.xml.aelfred2.XmlParser.parseDocument(XmlParser.java:416)  
at gnu.xml.aelfred2.XmlParser.doParse(XmlParser.java:167)  
at gnu.xml.aelfred2.SAXDriver.parse(SAXDriver.java:320)  
at gnu.xml.aelfred2.XmlReader.parse(XmlReader.java:294)  
at org.apache.xml.dtm.ref.DTMManagerDefault.getDTM(DTMManagerDefault.java:437)  
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:699)  
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1284)  
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1262)  
at org.apache.taglibs.xtags.xslt.StyleTag.doEndTag(StyleTag.java:157)  
at org.apache.jsp.jsp.chart.newleafmodel.tabdetail_jsp._jspService(tabdetail_jsp.java:698)  
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)  
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)  
... 29 more  

Is it anyway related to the xml parser which we configured for our webapps?

Since the exception is thrown from the XML parser, it is of course related to the parser. Why don't you try with Xerces instead?