-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Lewis,
On 12/18/2010 2:47 PM, McGibbney, Lewis John wrote: > I am currently using Apache Nutch 1.2 and Tomcat 6.0.26 (first post on list). Welcome. > 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. Tomcat 6.0.26 does not ship with a Xerces library: it uses whatever XML parser is provided by the JDK. If Jena requires an XML library, you should have that library installed in the webapp's WEB-INF/lib directory. > I understand that previously I could > replace the parser to match in $CATALINA_HOME/common/lib, however I > learned when running on JSE 5 the class loader delegation process > will default to the implementation inside the JDK. This ClassLoader delegation process is specified by the servlet spec, and I think has been consistent for quite some time: the webapp has first dibs on providing the classes (except for some special ones like java.lang.* and other non-overridable packages). > 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) That certainly does look like a library incompatibility. What version of Xerces ships with Jena? What happens if you simply remove Xerces from your webapp entirely? If Jena is using JAXP, then (ideally) everything should work. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk0NEiAACgkQ9CaO5/Lv0PAtIQCgvUDc18DEHHiKYOJ+ZqQmsFAH 7GMAoJBecWiAnpazTHtacGF6/VVFA443 =v1Oy -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
