well .. if there would be a possibility to define a custom class loader
this would enable an extension to load its own jars circumventing
conflicts with possible existing other versions of a library used by
jump or another extension. a nice feature from my point of view.
problem is: as far as i understand _all jars_ in 'ext' and its
subfolders currently get included in the default classloaders classpath
by the extension manager in order to find an initialize the plugins.
anybody knows if this is still true? so to avoid conflicts currently
have to be put outside of 'ext'. don't know any extension doing so by now.
in the end: custom classloaders really help to seperate
plugins/extensions from each other, thus preventing problems. also it
makes fiddling with the startup script (classloader var) obsolete,
making extension installation more user friendly (why should users care
about the classpath?).
anyway while writing the gt2readerwrite extension i experimented with a
custom classloader to find all available gt2 io modules. see this
SNIP-->
/**
* This is thought of as a way to dynamically load the gt2
readerwriter modules
* from a directory of choice. this way they don't have reside in
the general classpath
* but can be put in separate directory.
* <p>
* The property "user.dir" works for windows, i doubt it'll do for
linux/unix.
* </p>
*
* @return a classloader object, containing all available jars in
the specified directory
*/
public static ClassLoader createLoader(){
final String SEP = System.getProperty("file.separator");
String mod_dir = SEP+"lib"+SEP+"ext"+SEP+"readwrite";
File workingDir = new File(System.getProperty("user.dir"));
System.out.println("Working Dir: "+workingDir.getPath());
File extensionDir = new File(workingDir.getPath()+mod_dir);
if (!extensionDir.exists())
extensionDir = new
File(workingDir.getPath()+SEP+".."+mod_dir);
System.out.println("Extension Dir:
"+extensionDir.getPath());
File[] entries = extensionDir.listFiles();
Collection urls = new Vector();
try {
urls.add(extensionDir.toURL());
} catch (MalformedURLException e1) {}
for (int i = 0; entries != null && i < entries.length; i++) {
try {
urls.add(entries[i].toURL());
} catch (MalformedURLException e) { e.printStackTrace(); }
}
System.out.println("ExtDir contains: "+urls.toString());
return new URLClassLoader((URL[])urls.toArray(new URL[]{}));
}
<--SNIP
regards ede
--
Paul Austin wrote:
> It's OK I found a work around, I agree if we don't have to mess with
> classloaders then we shouldn't
>
> Paul
>
> Paul Austin wrote:
>
>> Right now the class loader used for loading extension classes does not
>> have a parent class loader set see
>> com.vividsolutions.jump.workbench.plugin.PlugInManager.
>>
>> I think that it should have a parent and it be set to the class loader
>> of the PlugInManager class (which is the system class path).
>>
>> Can anyone see any issues with doing this?
>>
>> Paul
>>
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>>
>
>
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--
public class WhoDidIt{ // A comment. I love comments
private static Person sender;
public static void main (String[] foo){
sender = new Person();
sender.setName(new String[]{"Edgar", "Soldin"});
Address address = new Address();
address.setStreet("Stadtweg 119");
address.setZip(39116);
address.setCity("Magdeburg");
address.setCountry("Germany");
sender.setAddress(address);
sender.setMobilePhone(" +49(0)171-2782880 ");
sender.setWebSiteUrl(" http://www.soldin.de ");
sender.setEmail(" [EMAIL PROTECTED] ");
sender.setPGPPublicKey(" http://www.soldin.de/edgar_soldin.asc ");
sender.setGender(true);
System.out.println(sender.toString());
}
}
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
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