Wanted: JNode Alias API in a jar

Submitted by gchii on Fri, 09/19/2008 - 15:42.

A separate jar for the JNode Alias API is a smaller request than a full-blown JNode emulator. It is difficult for me to work with the JNode Alias API because it is not yet available in a self-contained API-only jar.

I would like to import the JNode Alias API and use it in my own operating environment. I would like to write an application that runs on multiple platforms (Linux, Windows, JNode) and wherever possible reuse JNode-compatible APIs.

This API does not include one thing that is very important to me. It does not provide an actual Alias object. When a command class is loaded by a custom class loader, how do I create an alias for it? The aliasClassName property cannot find the command class, can it?

With OSGi, classes in a bundle are loaded by a separate class loader. A bundle is capable of automatically registering JNode-compatible command classes, except the Alias API does not yet support custom class loaders.

Thanks,

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Have you tried using Emu?

Submitted by Stephen Crawley on Fri, 09/19/2008 - 23:09.

I get the impression that you have not tried using Emu. I did some work on it recently to remove the hard-wiring of command classes, aliases and syntaxes. The latest version trawls the plugin descriptor files to extract aliases and syntaxes.

Give it a try. I avoid the issue of figuring out what should be on the classpath by launching Emu from my Eclipse JNode development workspace. But a brute-force approach would also work. I personally don't see the need for a JAR file for launching Emu, but a wrapper script would probably be a good idea.

If you have suggestions for improvements to Emu, put them on this issue: http://www.jnode.org/node/2755

"He sure can't fly but I'm telling you. He can run the pants off a kangaroo."

Prerequisites for running Emu?

Submitted by gchii on Mon, 10/13/2008 - 17:32.

My question is this: What is the recommended platform for running Emu? What are its prerequisites? What did you do to get it to work?

I am using Eclipse Ganymede on Microsoft Windows XP with Sun Microsystems JDK 6. JNode compiles cleanly from within Eclipse. When I run Emu, a window is displayed. Immediately, an exception is thrown. I am thinking that the Open JDK classes should not be used in Sun JDK, right?

I use Eclipse (Callisto) and Sun JDK 6.0 on Linux.

Submitted by Stephen Crawley on Mon, 10/13/2008 - 21:33.

... and Emu works for me. (Or at least, it did last time I tried.) What exception is being thrown?

If the root of your problem is and issue with Open JDK versus Sun JDK, we need to find a workaround. JNode is committed to using the Open JDK libraries.

Shell Emu exception on Microsoft Windows XP

Submitted by gchii on Tue, 10/14/2008 - 18:14.

Launching Shell Emu from within Eclipse on Microsoft Windows XP and Sun Microsystems JDK 6, the following exception is thrown after displaying the console window and prompt:

javax.naming.NameNotFoundException: org.jnode.driver.textscreen.TextScreenManager
at org.jnode.emu.Emu$1.lookup(Emu.java:74)
at org.jnode.naming.AbstractNameSpace.addNameSpaceListener(AbstractNameSpace.java:61)
at org.jnode.naming.InitialNaming.addNameSpaceListener(InitialNaming.java:58)
at org.jnode.driver.console.textscreen.TextScreenConsoleManager.(TextScreenConsoleManager.java:52)
at org.jnode.driver.console.swing.SwingTextScreenConsoleManager.(SwingTextScreenConsoleManager.java:27)
at org.jnode.emu.ShellEmu.main(ShellEmu.java:20)

Thanks,