Re: Running XML-parsing servlets on Tomcat, using JAXP ?

[Jean-Francois Arcand <jf...@apache.org>]

You don't need the jax-pack for your problem. Under 
{CATALINA_HOME}/common/endorsed, just copy the xerces.jar and the 
jaxp-ri.jar file. Tomcat will uses this folder for selecting which 
parser to use (so crimson will not be used).

-- Jeanfrancois

Soefara Redzuan wrote:

> Has anybody managed to run XML-parsing servlets on Tomcat 4 using JAXP?
> If so, could you please help me with the XML configuration for
> Tomcat because I keep getting class clashes. Here's what I've done
> so far,
>
> 1. Downloaded the Java XML Pack from
> http://java.sun.com/xml/javaxmlpack.html
>
> 2. Unpacked the Java XML Pack and put the JAXP jar files (dom.jar,
> jaxp-api.jar, sax.jar, xalan.jar, xercesImpl.jar and xsltc.jar)
> in the directory c:\jdk1.3\jaxp-1.2_01
>
> 3. Added all the jars to the CLASSPATH
>
> 4. The Java XML Pack instructions then read,
>
> > When you run the examples on Tomcat you must copy all
> > the JAR files from the Java XML Pack to CATALINA_HOME/common/lib .
> > Some of these files already exist in Tomcat distribution and
> > should be overwritten by the Java XML Pack JARs. The xerces.jar
> > that comes with the tomcat installation should also be removed
> > from CATALINA_HOME/common/lib.
>
> I copied all of the JAXP jar files (dom.jar, jaxp-api.jar,
> sax.jar, xalan.jar, xercesImpl.jar and xsltc.jar) to
> CATALINA_HOME/common/lib but strangely none of them existed
> there previously ! Also, there was no "xerces.jar" that
> supposedly came with the Tomcat distribution according to the
> Sun documentation.
> There is however, a crimson.jar (I'm using an early Tomcat4.x)
> and a jaxp.jar which I removed, since JAXP's jaxp-api.jar
> seems to contain updated libraries.
>
> 5. I restarted Tomcat and then tried to run a servlet which
> uses some XML-parsing, which I have already tested in a
> standalone command-line program and found to be working OK.
>
> However, the servlet generated this error,
> "java.lang.LinkageError: loader constraints violated when linking
> org/xml/sax/InputSource class"
>
> which I believe means that the Tomcat class loader is finding
> two conflicting org.xml.sax.InputSource classes (and possibly
> associated libraries).
>
> This was my big worry with adding XML libraries to my operating
> system, that they would clash with Tomcat's to stop functioning.
> How should I have arranged things to make this work ?
>
> I put all the JAXP libraries in c:\jdk1.3\jaxp-1.2_01 and added
> them to the CLASSPATH so that I can easily compile all XML programs
> without defining where to find the Sax libraries and classes,
> because my XML applications are not just for Tomcat.
>
> Thank you so much for any help.
>
> Soefara.
>
>
>
>
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