Re: Accessing Packages from LiveConnect

On 8 2 ,   4 03 , [email protected] wrote:
> On Jul 9, 9:36 am, Brett Zamir <[email protected]> wrote:
>
>
>
>
>
> > Hello,
>
> > I am trying to get access to Berkeley DB XML's Java classes from within
> > XUL and it doesn't seem to work for me.
>
> > Whereas I can get the built-in Java packages from XUL with no problem:
>
> >     var abc = java.lang.System.out.println("aaaa");  // Writes
> > sucessfully to the Java Console that I have set to open
>
> > I have no luck with BDBXML from XUL, even though it is in my CLASSPATH
> > (if that's where it's supposed to be for it to be available):
>
> >     var xmlman = new Packages.com.sleepycat.dbxml.XmlManager();
>
> >     gives:
>
> >     TypeError: Packages.com.sleepycat.dmxml.XmlManager is not a constructor
>
> > I've also successfully been able to test what should I believe be the
> > equivalent file in Java (using NetBeans) and there is no problem.
>
> > import com.sleepycat.dbxml.*;
> > import java.io.*;
>
> > public class Main {
> >     public static void main(String[] args) throws Throwable {
> >         try {
> >             XmlManager myManager = new XmlManager();
> >         }
> >         catch (XmlException e) {
> >             System.out.println("XMLexception" + e);
> >         }
> >         catch (Exception e) {
> >             System.out.println("Exception1" + e);
> >         }
> >     }
>
> > }
>
> > thx in advance,
> > Brett
>
> Hi, I am using a class loader to load external packages. I want to
> load "java lapack classes". Here is a piece of code:
>
> ...
>   var fURL = new Array();
>   fURL[1] = new java.net.URL("file:///H:/Devel/NetbeansProjects/
> JavaLapack/jlapack-0.8/blas_simple.jar");
>   fURL[2] = new java.net.URL("file:///H:/Devel/NetbeansProjects/
> JavaLapack/jlapack-0.8/f2jutil.jar");
>   fURL[3] = new java.net.URL("file:///H:/Devel/NetbeansProjects/
> JavaLapack/jlapack-0.8/lapack.jar");
>   fURL[4] = new java.net.URL("file:///H:/Devel/NetbeansProjects/
> JavaLapack/jlapack-0.8/lapack_simple.jar");
>   fURL[5] = new java.net.URL("file:///H:/Devel/NetbeansProjects/
> JavaLapack/jlapack-0.8/blas.jar");
>   fURL[6] = new java.net.URL("file:///H:/Devel/NetbeansProjects/
> JavaLapack/jlapack-0.8/xerbla.jar");
>
>   var loader = new java.net.URLClassLoader(fURL);
>
>   var class1 = loader.loadClass("org.netlib.blas.DGEMM");
>
>   var instance1 = class1.newInstance();
> ...
>
> fURL contains the list of jars where all your classes are. You have to
> load all packages needed by the class(es) that you want to use. Then
> you create a loader, using java.net.URLClassLoader. From that you get
> the class using loader.loadClass and finally you create an instance of
> that class.
>
> Be sure to use file:/// when loading the jars.
>
> m.-         -
>
> -         -

if doing so, it's too stuffy