Hi Pid, I understand this now, my initial understanding was that Tomcat was distributed with a version of xerces (or some other) parser implementation and that the two libararies were in conflict resulting in the errors during webapp launch.
I am trying to get to the bottom of what org.apache.xerces.util.XMLChar is and why it is causing the exceptions and errors when I lanuch the webapp. Can you expand on your final statement to provide more detail please, I am unfamilar with this configuration. Thanks Lewis ________________________________________ From: Pid [...@pidster.com] Sent: 18 December 2010 21:07 To: Tomcat Users List Subject: Re: HTTP Status 500 - Server Internal Error On 18/12/2010 19:47, McGibbney, Lewis John wrote: > Hello List, > > I am currently using Apache Nutch 1.2 and Tomcat 6.0.26 (first post on list). > I recently configured use of a plugin within Nutch which has been known to > cause the above error due to the fact that Tomcat and Jena (a framework for > building semantic web apps) are using conflicting versions of xerces library. > I understand that previously I could replace the parser to match in > $CATALINA_HOME/common/lib, Match what? Tomcat 6 doesn't have a CATALINA_HOME/common/lib, unless you've reconfigured the classloader. Tomcat does however configure -Djava.endorsed.dirs=$CATALINA_HOME/endorsed P however I learned when running on JSE 5 the class loader delegation process will default to the implementation inside the JDK. I have therefore ended up reading about the endorsed standards override mechanism but have strayed slightly and now think it is best to seek help! > The Jena jar packaged with the Nutch plugin was released in 2004 so I am > aware that I would probably need to 'downgrade' the Tomcat xerces parser > library for testing purposes. I attach part of the exception report to give > an idea of the problem. Any suggestions would be appreciated. Thank you > > Lewis > > > exception > > org.apache.jasper.JasperException: javax.servlet.ServletException: > java.lang.NoClassDefFoundError: org/apache/xerces/util/XMLChar > > org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:491) > > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:401) > > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) > org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) > javax.servlet.http.HttpServlet.service(HttpServlet.java:717) > > > root cause > > javax.servlet.ServletException: java.lang.NoClassDefFoundError: > org/apache/xerces/util/XMLChar > > org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862) > > org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791) > org.apache.jsp.search_jsp._jspService(search_jsp.java:886) > org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) > javax.servlet.http.HttpServlet.service(HttpServlet.java:717) > > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) > > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) > org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) > javax.servlet.http.HttpServlet.service(HttpServlet.java:717) > > > Glasgow Caledonian University is a registered Scottish charity, number > SC021474 > > Winner: Times Higher Education's Widening Participation Initiative of the > Year 2009 and Herald Society's Education Initiative of the Year 2009 > http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,6219,en.html > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > Glasgow Caledonian University is a registered Scottish charity, number SC021474 Winner: Times Higher Education’s Widening Participation Initiative of the Year 2009 and Herald Society’s Education Initiative of the Year 2009 http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,6219,en.html
