| Typecasting Plugin classes [message #115773] |
Tue, 11 November 2003 11:39  |
Eclipse User |
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Originally posted by: javibasi.yahoo.es
Hi all
I'm experiencing some problems trying to develop an Eclipse plugin and I
wondered if anyone could give me any hint about what I'm not doing well.
A little bit of background: my plugin tries to do some actions on a java
class file from the workspace. In order to do that, it gets an instance of
that class. The problem arises when I try to typecast the object into its
parent class and I get an ClassCastException.
The parent class is contained on a jar file that I've imported into my
plugin. I've tried several ways to instatiate the object:
- Class.forName.
- URLClassLoader, setting as parent the Plugin and Platform Classloaders
and adding the neccesary jars in each case.
- Getting the System ClassLoader and, by reflection, calling the addURL
method to set the new jar path.
But in all that attempts I get the same error. I've been forced to use
reflection to call the methods of my object, and it works. But I'm trying
to find a way to make the typecast in order to use some interfaces that
need it.
I guess I'm making some mistake when I choose the type of classloader I
use to get the instance of the object, but I can't find the right way to
do it.
I've been browsing several forums and newsgroups and I found more people
with this problem but without a final solution, so if anyone has got this
to work, any help would be highly appreciated.
Thanks in advance
Dian Cecht
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| Re: Typecasting Plugin classes [message #116639 is a reply to message #115811] |
Thu, 13 November 2003 10:17  |
| Eclipse User |
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Originally posted by: javibasi.yahoo.es
If anyone is interested in this issue, what I finally did was gatting the
instance of my workspace classes by defining an URLClassLoader parented
with the Plugin or Platform classloader. The I used reflection to get and
execute the methods of my workspace object.
I know it's a bit dangerous loading foreing objects into de IDE, but this
is the only way I found, as long as the AST can give you full information
about a class, but cannot return the result of executing a method.
Dian Cecht
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