[basex-talk] Java Modules - Constructor

5 May 2017

      Hi all,

I am running BaseX 8.6.3 currently and struggling with the inclusion of 
modules written in Java. I have extended the Hello World example:

package org.basex.modules;

public class Hello {

     private String str = "BaseX";

     public Hello() {}

     public Hello(String str) {
         this.str = str;
     }

     public String hello(final String world) {
         return "Hello " + world;
     }

     public String hello() {
         return "Hello " + str;
     }
}

I can pack it into a jar-file and install it successfully. My jar-file 
is structured as following:

hello.jar
   - META-INF
     - MANIFEST.MF
   - org
     - basex
       - modules
         - Hello.class

Here is the content of my manifest.mf:

Manifest-Version: 1.0
Main-Class: org.basex.modules.Hello

The methods of the Hello-class can be called without any problems when 
the module is imported:

import module namespace t='org.basex.modules.Hello';

t:hello('text')

However, when I try to explicitly create the object by calling the 
constructor (new) with arguments it fails:

declare namespace t='org.basex.modules.Hello';

let $obj := t:new('test')

return ''

When I try to call the constructor I receive the error [XPST0017] 
Unknown function: Q{org.basex.modules.Hello}new.

Since I am able to execute the FileWriter example 
(http://docs.basex.org/wiki/Java_Bindings#Namespace_Declarations) which 
calls a constructor with an argument I would like to know if this 
behavior is a bug or if I am missing an important point.

Regards,
Ilko

[basex-talk] Java Modules - Constructor

kovacic