Re: [castor-user] Mapping exception error

ar Mon, 29 Nov 2004 09:09:23 -0800

Thanks for your answer. I tried to create the mapping class using my object class loader, but it didn't work. In fact, my problem was that I had forgotten to package the Castor XML library in my EAR archive, so my JBoss instance used the castor classes deployed by the snmp-adaptor.sar archive. After packaging my EAR with castor-xml.0.9.5.3.jar, I got other problems but solved the class not found exception.

Regards
AR

Le Fri, 26 Nov 2004 10:13:42 -0500, Leo Joncas <[EMAIL PROTECTED]> a �crit:

Sounds like a class loader problem.

We use Castor in a J2EE (JBoss/Tomcat) environment.  When we create an
instance of the Castor Mapping class, we use the constructor where we
can specify a class loader, as in

Mapping CASTOR_REQUEST_MAPPING = new
Mapping(some_class_of_yours.class.getClassLoader());
  :
CASTOR_REQUEST_MAPPING.loadMapping(REQUEST_MAPPING_URL);


where "some_class_of_yours" is any class you choose in your WAR.
REQUEST_MAPPING_URL is the URL for your mapping file (generated via a
local entity resolver or whatever mechanism you choose).


Leo Joncas


-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Friday, November 26, 2004 9:44 AM
To: [EMAIL PROTECTED]
Subject: [castor-user] Mapping exception error


Hi all,

I want to use Costor to marshal objects to XML stream in a J2EE
environment.

I have to marshal an ArrayList of  MyObject entity objects. These
objects
aren't Entity Beans, but plain Java objects mapped to a database using
Hibernate.

I created a simple mapping file :

<!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN"
                          "http://castor.exolab.org/mapping.dtd";>
<mapping>
   <description>Country List mapping</description>
   <class name="java.util.ArrayList"
          auto-complete="true">
     <map-to xml="myobjects" />
   </class>
</mapping>

All works fine. I get :

<?xml version="1.0" encoding="UTF-8"?>
<myobjects>
   <my-object num="1">
      <attr1>Value 1-1</attr1>
      <attr2>Value 1-2</attr2>
      <attr3>Value 1-3</attr3>
   </my-object>
   <my-object num="2">
      <attr1>Value 2-1</attr1>
      <attr2>Value 2-2</attr2>
      <attr3>Value 2-3</attr3>
   </my-object>
</myobjects>

Now I wanted to change the mapping to remove some attributes from the
resulting XML file. I modified the mapping file like this :

<!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN"
                          "http://castor.exolab.org/mapping.dtd";>
<mapping>
   <description>Country List mapping</description>
   <class name="java.util.ArrayList"
          auto-complete="true">
     <map-to xml="myobjects" />
   </class>
   <class name="com.myorg.myproject.entities.MyObject"
          auto-complete="true">
     <map-to xml="myobject" />
     <field name="attr1" transient="true"/>
     <field name="attr3" transient="true"/>
   </class>
</mapping>

When I try to marshal using this mapping, I get the error message :
org.exolab.castor.mapping.MappingException: Could not find the class
com.myorg.myproject.entities.MyObject
    at
org.exolab.castor.mapping.loader.MappingLoader.createDescriptor(MappingL
oader.java:340)
    ...

I'm sure of the package path. Are there restrictions on the Castor use
in
a J2EE environment ?
Any suggestion ?


Regards


--
A. ROY

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