commons-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Juozas Baliuka" <bali...@centras.lt>
Subject Re: RE: Re: ClassCastException raised in newFactory() method when starting from JUnit test
Date Sat, 04 May 2002 18:49:30 GMT
Hi,
Yes it can solve the problem in JUnit and it is possible to solve this
problem in app containers by adding commons-logging to sytem classpath, but
I think it is good to
to add factory method with ClassLoader paramater or use the same classloader
for interface and implementation loading, it must be trivial to fix.

----- Original Message -----
From: "Rice Yeh" <riceyeh@netscape.net>
To: ""Jakarta Commons Developers List"" <commons-dev@jakarta.apache.org>
Sent: Saturday, May 04, 2002 7:44 PM
Subject: RE: RE: Re: ClassCastException raised in newFactory() method when
starting from JUnit test


> Hi,
>   I find a quick solution to this problem. It is to add the following
properties to junit's excluded.properties file, which is located in package
junit.runner.
>
> excluded.6=org.apache.commons.logging.*
> excluded.7=org.xml.*
>
>  Because Digest's test programs seem having similar problem. By adding
org.xml.* to this file, it is solved. By adding these two properties, then
these kinds of classes will be loaded by system classloader and hence not
reloadable from junit. I just wonder developer writting this test program
have any other way out or just do not meet this problem.
>
> Regards,
> Rice
>
> riceyeh@netscape.net (Rice Yeh) wrote:
>
> >Hi,
> > newFactory() use thread context classloader to load class. It is like
> >
> >clazz = classLoader.loadClass(factoryClass);
> >return (LogFactory) clazz.newInstance();
> >
> >where classLoader is thread context loader. I am confused with java's
classloader's mechanism. Does this problem have anything to do with
namespace? It should be no. Isn't?
> > Another mail said this problem is just like anothe problem rasing
ClassNotFound Exception. Could any detail explanation be provided? Thank
you.
> >
> >Regards,
> >Rice
> >
> >
> >
> >"Juozas Baliuka" <baliuka@centras.lt> wrote:
> >
> >>Sorry,
> >>"MyCass obj = (MyCass)Class.forName(MyCass.class.getName());"
> >>----- Original Message -----
> >>From: "Juozas Baliuka" <baliuka@centras.lt>
> >>To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org>
> >>Sent: Wednesday, May 01, 2002 9:49 PM
> >>Subject: Re: ClassCastException raised in newFactory() method when
starting
> >>from JUnit test
> >>
> >>
> >>> Hi,
> >>> I am not sure about "newFactory()", but in the most problem is like
this:
> >>>
> >>> MyCass obj = Class.forName(MyCass.class.getName());
> >>>
> >>> This allways throws ClassCastException if this code is loaded not by
> >>> "SystemClassLoader".
> >>> In this case we have two diferent classes, the same name but not
> >>> ClassLoader.
> >>>
> >>> This is OK:
> >>> MyCass obj = Class.forName(MyCass.class.getName(),true,
> >>> MyCass.class.getClassLoader() );
> >>>
> >>> Both classes have the same name and ClassLoader.
> >>>
> >>> if "newFactory()" doe's "Class.forName" it must have alternatyve:
> >>> "newFactory(ClassLoader cl)" and use "cl" as parameter in
"Class.forName".
> >>>
> >>>
> >>>
> >>>
> >>> ----- Original Message -----
> >>> From: "Rice Yeh" <riceyeh@netscape.net>
> >>> To: ""Jakarta Commons Developers List""
<commons-dev@jakarta.apache.org>
> >>> Sent: Wednesday, May 01, 2002 2:48 PM
> >>> Subject: RE: ClassCastException raised in newFactory() method when
> >>starting
> >>> from JUnit test
> >>>
> >>>
> >>> > Hi,
> >>> > Sorry, I past wrong attachement. The original one will not cause
this
> >>> problem. I attache a new one, which just moves
> >>> >
> >>> > Digester d = new Digester();
> >>> > System.out.println("OK");
> >>> > to testLogging() method.
> >>> >
> >>> > Regards,
> >>> > Rice
> >>> >
> >>> > riceyeh@netscape.net (Rice Yeh) wrote:
> >>> >
> >>> > >Hi all,
> >>> > >
> >>> > > Just wonder why ClassCastException is raised at line 496 of
LogFactory
> >>> in newFactory() method when running as a JUnit test? I found this
problem
> >>> when running RequiredNameTest in commons-validator. When casting a
class
> >>to
> >>> some superclass, does classloader from other thread form a namespace
and
> >>so
> >>> can NOT cast it? Java language spec seems not regulate this. I have
proven
> >>> this with a small program.
> >>> > > Attached are JUnit test files I use to study this problem.
> >>> > >
> >>> > >Regards,
> >>> > >Rice
> >>> > >
> >>> > >
> >>> > >__________________________________________________________________
> >>> > >Your favorite stores, helpful shopping tools and great gift ideas.
> >>> Experience the convenience of buying online with Shop@Netscape!
> >>> http://shopnow.netscape.com/
> >>> > >
> >>> > >Get your own FREE, personal Netscape Mail account today at
> >>> http://webmail.netscape.com/
> >>> > >
> >>> >
> >>> >
> >>> > __________________________________________________________________
> >>> > Your favorite stores, helpful shopping tools and great gift ideas.
> >>> Experience the convenience of buying online with Shop@Netscape!
> >>> http://shopnow.netscape.com/
> >>> >
> >>> > Get your own FREE, personal Netscape Mail account today at
> >>> http://webmail.netscape.com/
> >>> >
> >>>
> >>>
>
>>> ------------------------------------------------------------------------
--
> >>--
> >>> ----
> >>>
> >>>
> >>> > /*
> >>> > * TestSuite.java
> >>> > * JUnit based test
> >>> > *
> >>> > * Created on May 1, 2002, 7:38 PM
> >>> > */
> >>> >
> >>> > package test;
> >>> >
> >>> > import junit.framework.*;
> >>> > import org.apache.commons.digester.Digester;
> >>> >
> >>> > /**
> >>> > *
> >>> > * @author Rice Yeh
> >>> > */
> >>> > public class LoggingFromDigestTest extends TestCase
> >>> > {
> >>> >
> >>> > public LoggingFromDigestTest(java.lang.String testName)
> >>> > {
> >>> > super(testName);
> >>> > }
> >>> >
> >>> > public static void main(java.lang.String[] args)
> >>> > {
> >>> >
> >>> >
> >>> > junit.swingui.TestRunner.run(suite());
> >>> > }
> >>> >
> >>> > public void setUp()
> >>> > {
> >>> >
> >>> > }
> >>> >
> >>> >
> >>> >
> >>> > public static Test suite()
> >>> > {
> >>> > TestSuite suite = new TestSuite(LoggingFromDigestTest.class);
> >>> >
> >>> > return suite;
> >>> > }
> >>> >
> >>> > public void testLogging()
> >>> > {
> >>> > Digester d = new Digester();
> >>> > System.out.println("OK");
> >>> > }
> >>> >
> >>> > public void tearDown()
> >>> > {
> >>> > }
> >>> > }
> >>> >
> >>> >
> >>>
> >>>
>
>>> ------------------------------------------------------------------------
--
> >>--
> >>> ----
> >>>
> >>>
> >>> > --
> >>> > To unsubscribe, e-mail:
> >>> <mailto:commons-dev-unsubscribe@jakarta.apache.org>
> >>> > For additional commands, e-mail:
> >>> <mailto:commons-dev-help@jakarta.apache.org>
> >>>
> >>>
> >>> --
> >>> To unsubscribe, e-mail:
> >><mailto:commons-dev-unsubscribe@jakarta.apache.org>
> >>> For additional commands, e-mail:
> >><mailto:commons-dev-help@jakarta.apache.org>
> >>>
> >>
> >>
> >>--
> >>To unsubscribe, e-mail:
<mailto:commons-dev-unsubscribe@jakarta.apache.org>
> >>For additional commands, e-mail:
<mailto:commons-dev-help@jakarta.apache.org>
> >>
> >>
> >
> >
> >__________________________________________________________________
> >Your favorite stores, helpful shopping tools and great gift ideas.
Experience the convenience of buying online with Shop@Netscape!
http://shopnow.netscape.com/
> >
> >Get your own FREE, personal Netscape Mail account today at
http://webmail.netscape.com/
> >
> >
> >--
> >To unsubscribe, e-mail:
<mailto:commons-dev-unsubscribe@jakarta.apache.org>
> >For additional commands, e-mail:
<mailto:commons-dev-help@jakarta.apache.org>
> >
> >
>
>
> __________________________________________________________________
> Your favorite stores, helpful shopping tools and great gift ideas.
Experience the convenience of buying online with Shop@Netscape!
http://shopnow.netscape.com/
>
> Get your own FREE, personal Netscape Mail account today at
http://webmail.netscape.com/
>
>
> --
> To unsubscribe, e-mail:
<mailto:commons-dev-unsubscribe@jakarta.apache.org>
> For additional commands, e-mail:
<mailto:commons-dev-help@jakarta.apache.org>
>


--
To unsubscribe, e-mail:   <mailto:commons-dev-unsubscribe@jakarta.apache.org>
For additional commands, e-mail: <mailto:commons-dev-help@jakarta.apache.org>


Mime
View raw message