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Problems creating objects via reflection [message #1785870]

Sat, 21 April 2018 09:54

Markus Amshove

Messages: 25
Registered: March 2016

Junior Member

Hi,

I'm writing an Eclipse plugin which relies on a library which creates objects based on reflection once initialized.

It uses org.reflections:reflections:0.9.11 if that matters.

When using that library in any other program which is not a Eclipse plugin (e.g. command line or web project) it works flawlessly, however Eclipse doesn't seem to allow the library to find anything via reflection.

Is this a problem with OSGi and is there a way to either allow it to do its thing or do I have to change something in the library itself? I would like to keep it working everyhwere.

Thanks in advance!

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Re: Problems creating objects via reflection [message #1786120 is a reply to message #1785870]

Wed, 25 April 2018 19:07

Brian de Alwis

Messages: 772
Registered: January 2012

Senior Member

From the org.reflections doc, it scans and indexes the jars found on the classpath. That works fine in normal Java program as it has a flat classpath. OSGi on the other hand provides managed classpaths, such that each bundle has an independent classpath. You'll likely need to create a new Reflections instance for each bundle that you want to do lookups from, and somehow carry the appropriate reflections instance around.

Brian.

Eclipse Platform committer. Ask me about Eclipse support, training, and consulting.

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Re: Problems creating objects via reflection [message #1786735 is a reply to message #1786120]

Thu, 10 May 2018 08:50

Markus Amshove

Messages: 25
Registered: March 2016

Junior Member

Thank you for the hint Brian, I now see why it wouldn't work.

Is there a recommended way to accomplish it?

I have the following layout:

- eclipse-plugin -> all my UI stuff and where I need to instantitate objects from Library
- eclipse-plugin-library -> wrapper around Library to be able to use it as Eclipse plugin (just an exposed jar file)
- Library -> the actual library

So the dependencies (and maybe load order) is

eclipse-plugin
|
| depends on
|
\ /
eclipse-plugin-library
|
| depends on / provides
|
\ /
Library

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Re: Problems creating objects via reflection [message #1786746 is a reply to message #1786735]

Thu, 10 May 2018 14:32

Brian de Alwis

Messages: 772
Registered: January 2012

Senior Member

It comes down to providing the classloader of the lookup location. It's best if you can pass the classloader, but sometimes setting the Thread's Context Class Loader can work too.

Eclipse Platform committer. Ask me about Eclipse support, training, and consulting.

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