Hi,
In Carol project (used by JOnAS project), the RMI context factory is
resolved by a call to the javax.naming.spi.NamingManager class [1].
With JVMs using GNU Classpath, the context returned by calling
NamingManager.getURLContext(,) method is null, while with Sun/Bea/IBM
JDK, it is non-null.
When looking at the GNU classpath class source code:
http://cvs.savannah.gnu.org/viewcvs/classpath/javax/naming/spi/NamingManager.java?rev=1.9&root=classpath&view=log
There are some issues.
For example, there is the following code :
if (prefixes == null)
{
// Specified as the default in the docs. Unclear if this is
// right for us.
prefixes = "com.sun.jndi.url";
}
By default, (see
http://java.sun.com/j2se/1.3/docs/api/javax/naming/spi/NamingManager.html)
it doesn't mean that it should not be added to the existing prefixes,
and it is strange to add some sun prefixes in GNU classpath.
When using rmi as scheme, with Sun JVM, the expected class is
"com.sun.jndi.url.rmi.rmiURLContextFactory" (as written in the guide
http://java.sun.com/j2se/1.4.2/docs/guide/jndi/jndi-rmi.html ).
With GNU classpath, if we have a prefix (JOnAS case), it will then try
to instantiate a class rmiURLContextFactory with different packages. But
none of them will be found (and it doesn't search in com.sun.jndi.url
package as there is already a package : prefixes != null).
I tried to search a rmiURLContextFactory class in GNU classpath but I
didn't find one (with this name).
So, I think that a rmiURLContextFactory class and iiopURLContextFactory
should be added in a GNU classpath package.
And that the default prefix to use should be the package containing the
2 previous classes. Moreover, this prefix should be added for all cases
(and not only when prefixes is null).
Without these classes, JOnAS couldn't run with RMI/JRMP, RMI/IRMI and
RMI/IIOP (only jeremie should be working as the context factory is in
jeremie package. But jeremie is deprecated and I want to run JOnAS with
IRMI).
[1] example of code reproducing a NULL context by using GNU classpath
(and a non-null context with proprietary jvm like Sun/Bea/IBM)
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.spi.InitialContextFactory;
import javax.naming.spi.NamingManager;
public class TestJNDI {
public static void main(String[] args) throws Exception {
Hashtable env = new Hashtable();
env.put(Context.PROVIDER_URL, "rmi://localhost:1099");
env.put(Context.INITIAL_CONTEXT_FACTORY,
URLInitialContextFactory.class.getName());
env.put(Context.URL_PKG_PREFIXES, "test.jndi");
Context ctx = NamingManager.getURLContext("rmi", env);
System.out.println("Ctx = " + ctx);
}
public class URLInitialContextFactory implements
InitialContextFactory {
public Context getInitialContext(Hashtable environment) throws
NamingException {
return null;
}
}
}
Regards,
Florent
