[Mulgara-general] Not yet for newbie

Tue Nov 21 08:22:28 UTC 2006

It does not work.  I got such problem. I got it around
with itqlinterpreterbean though.  Thanks for your
help.

javax.servlet.ServletException

org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:858)

org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)

org.apache.jsp.index_jsp._jspService(index_jsp.java:107)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)

root cause 

java.lang.NoClassDefFoundError

sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)

sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

java.lang.reflect.Constructor.newInstance(Constructor.java:494)
	java.lang.Class.newInstance0(Class.java:350)
	java.lang.Class.newInstance(Class.java:303)

org.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:116)

org.apache.jsp.index_jsp._jspx_meth_mulgara_init_0(index_jsp.java:119)

org.apache.jsp.index_jsp._jspService(index_jsp.java:88)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)

--- David Wood <dwood at softwarememetics.com> wrote:

> Hi Guojin,
> 
> Thanks for your description of our documentation
> problems.  We can  
> use your mail to address the documentation before
> the next Mulgara  
> release.
> 
> It is unfortunate that you are trying to use the JSP
> library with  
> Mulgara.  I do not believe that the JSP library has
> been touched in  
> years and it is only tested via the unit tests.  You
> are therefore  
> probably right about Java 1.5. classes causing
> problems with it.
> 
> These directions should get you going, but I HAVE
> NOT TRIED THEM.   
> Let me know if you continue to have trouble and I
> will see if I can  
> give you confirmed directions.  Please make sure you
> give me the  
> details of your environment if that becomes
> necessary.
> 
> The JSP library uses the SOAP endpoint in the API. 
> It depends on a  
> servlet container that supports the JavaServer Pages
> Specification,  
> version 1.1 or higher.
> 
> In Mulgara, the JSP library JAR has been moved to
> <install_dir>/bin/ 
> tag-base-1.1.0.jar - that may be been enough to
> confuse you if you  
> were looking at the JSP directions on the old Kowari
> documentation  
> site (at http://kowari.org/oldsite/485.htm).
> 
> You will have to copy .../bin/tag-base-1.1.0.jar and
> .../bin/ 
> taglib.tld to the /WEB-INF/lib directory of your Web
> application server.
> 
> Then, add a <taglib> element to your Web application
> deployment  
> Descriptor in /WEB-INF/web.xml:
> 
> <taglib>
>   
>
<taglib-uri>http://www.mulgara.org/mulgara/taglibs/mulgara</taglib-
> 
> uri>
>   
>
<taglib-location>/WEB-INF/lib/tag-base-1.1.0.jar</taglib-location>
> </taglib>
> 
> NB: Note that the URI and JAR file names are
> different than for Kowari!
> 
> Next, add this directive to the top of each of your
> JSP pages:
> 
> <%@ taglib prefix="mulgara"
> uri="http://www.mulgara.org/mulgara/ 
> taglibs/mulgara"%>
> 
> 
> The JSP tags you will then have available are:
> init - Initializes the Mulgara JSP tag environment
> by setting the  
> SOAP endpoint of the Mulgara server
> render - Renders an XML document using a supplied
> stylesheet
> statement - Sends queries to a Mulgara server
> query - Adds an iTQL query to a statement
> execute - Executes queries in a statement
> answer - Retrieves query answers from a statement
> 
> 
> An example JSP page would work like this, if you
> change the init tag  
> to point to your Mulgara instance:
> 
> <%-- initialise the environment with the SOAP
> endpoint's URL--%>
> <mulgara:init
> server="http://mysite.com:8080/webservices/services/
> 
> ItqlBeanService"/>
> <%-- render the results of a query --%>
> <mulgara:render stylesheet="/default.xsl">
> 
>    <%-- execute a statement --%>
>    <mulgara:statement>
> 
>      <mulgara:query>
>        select $subj $pred $obj from
> rmi://localhost/server1#foo where  
> $subj $pred $obj ;
>      </mulgara:query>
> 
>      <%-- execute the query --%>
>      <mulgara:execute/>
> 
>    </mulgara:statement>
> </mulgara:render>
> 
> 
> Regards,
> Dave
> 
> 
> On 20 Nov2006, at 05:02, Guojun Zhu wrote:
> > Hi,
> >
> > I am a newbie for the rdf.  I know fairly amount
> about
> > java and sql though.  Kowari and Mulgara are great
> > stuff. The tutorial of itql is also very nice.  I
> > admire your hard work.   However, I would express
> some
> > frustration on these especially, the
> documentation.
> >
> > I guess you have already see my message about
> weird
> > problem with kowari-1.2.  It works on and off with
> my
> > jsp codes on tomcat 5.5.  I highly suspect it is
> > because of some java 1.5 class in my codes.  And I
> > suspected some bugs of packaging problem with it.
> >
> > One thing I am sure is that the javadoc with it is
> > non-synchronized.  One class mentioned in the jrdf
> > tutorial of wiki, AbstractGraphFactory for
> client-side
> > model is not in the jar file while it is in the
> > javadoc.
> >
> > The non-existing documentation really gives me
> > headache.  I have a running kowari server and
> would
> > like to access it from a web application of jsp in
> > tomcat.  The Tag part is not completed in the
> wiki.
> > The jrdf tutorial use this non-existing class. And
> > jrdf has almost no documents itself.   Jena's
> tutorial
> > is quite short and
> > jena's own site is not that clear either.
> >
> > Also, the example class mentioned in the tutorial
> > exists in the jar as class but I just cannot find
> them
> > in the source package.
> >
> > Can anyone give me a simple example to access the
> > database please?  I only need to access it from a
> java
> > class with jsp in the tomcat.  I do not need to
> > perform any advance function.  The only type of
> the
> > queries I would like to perform is  "select $o
> from
> > <rmi://localhost:test#test> where <hfk>
> <jfkd:title>
> > $o".
> 

____________________________________________________________________________________
Sponsored Link

Compare mortgage rates for today. 
Get up to 5 free quotes. 
Www2.nextag.com