Hello list,
I apologies in advance for the rather large post.
Using Nutch-1.2
Tomcat 6.0.26
I attempted to get this working a while ago and I am now back to ask for advice
when using this particular plugin (if anyone is using it). According to the
wiki, when a search query is executed search.jsp can fail due to Tomcat and
Jena using conflicting versions of the same xerces library. In my case I got
the following
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page
/./refine-query-init.jsp at line 34
31: try {
32: Configuration nutchConf = NutchConfiguration.get(application);
33: String urls = nutchConf.get("extension.ontology.urls");
34: ontology = new
org.apache.nutch.ontology.OntologyFactory(nutchConf).getOntology();
35: if (urls==null || urls.trim().equals("")) {
36: // ignored siliently
37: } else {
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
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)
Looking at the java.lang.NoClassDefFoundError's (as there are 3 root causes in
all), I see that
XMLChar is consistent. I'm hoping that this is good news and all I need to do
is update the Tomcat
Xerces library to match Jena.
Does anyone have information as to how I can do this? I have tracked down the
xercesImpl.jar within
\apache-tomcat-6.0.26-windows-x86\apache-tomcat-6.0.26\webapps\nutch-1.2\WEB-INF\classes\plugins\lib-xml
but I am not sure which version this is. I am also not sure which version Jena
is using!
Thank you
Lewis
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
