Re: Accessing Packages from LiveConnect

Hello,

This appears to be a reply to a reply? (I didn't see the previous reply, 
if so...)

Anyhow, I appreciate very much the response with the details of loading 
a class.... Thankfully, I was helped out earlier, so I got past that point.

However, you may wish to review what I learned at 
http://developer.mozilla.org/en/docs/Talk:Java_in_Firefox_Extensions to 
make sure I have worded it out correctly, as I believe it should be 
helpful for others to know how to do this. Someone else besides myself 
had asked for a working example before, so I have tried to offer one on 
this talk page, as well as with other details (such as a way to pass in 
an argument to the constructor), but it'd be nice for someone more 
experienced in Java, etc. to to give it a look over to make sure there 
is not a more efficient way, etc. to do those thigns.

best wishes,
Brett


[email protected] wrote:
> 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
>
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