Re: using ikvm within the context of a dll: java.lang.ClassCastException: Unable to cast object of type 'java.util.PropertyResourceBundle' to type 'sun.util.resources.OpenListResourceBundle'.

I've written a test to simulate this problem and if there is enough
interest i'll upload it to GitHub. The good news is I see what the issue is
and see that Jeroen provided the answer but I think it was lost in
translation.

The issue here is that the Assembly **Binaries**, the files themselves must
be in the same directory as the executing assemblies file. The .NET
Executable Project within Visual Studio itself does NOT need the
references. So you can still maintain your abstraction that I assume you're
looking for.

You just need to have an After-Build event on the project to copy the IKVM
assemblies into the bin/Release and bin/Debug directories. You can even
setup flags for this and have the Library do the copying in order to keep
the separation.

To illustrate this you can add this code anywhere before you call IKVM
converted classes and your program will work.

// Make sure the IKVM OpenJDK files can be found in the same directory
// as the executing assembly.
DirectoryInfo root = new DirectoryInfo(@"OpenJDKLocation");
foreach (var fileInfo in root.GetFiles("IKVM.*.dll"))
{
  if (!File.Exists(Path.Combine(new
FileInfo(Assembly.GetExecutingAssembly().Location).Directory.FullName,
fileInfo.Name)))
    {
      File.Copy(fileInfo.FullName, Path.Combine(new
FileInfo(Assembly.GetExecutingAssembly().Location).Directory.FullName,
fileInfo.Name));
    }
}

At the end of the day the Assemblies have to be on the production system
somewhere. The problem with the mixture of the OpenJDK, IKVM and the .NET
runtime is that the OpenJDK files have to be in the same directory. You
don't need them reference from the executing project, thus, you can keep
the abstraction in place and your executable never needs to know it's
calling IKVM'fied classes.

Andrew T. Finnell

On Fri, Apr 29, 2016 at 12:36 PM Oliver Egger <[email protected]> wrote:

> Hi Jeroen
>
> Thanks for your quick answer.
>
> Is this a classpath loader issue that the classes are not visible from the
> dependent dll's?
> Is the bug already raised in OpenJDK and might it be that it get resolved
> in a future release?
>
> Best regards
> Oliver
>
>
> On 29 April 2016 at 15:55, Jeroen Frijters <[email protected]> wrote:
>
>> Hi Oliver,
>>
>>
>>
>> No, all IKVM.OpenJDK.*.dll assemblies must be in the application’s bin
>> directory.
>>
>>
>>
>> The exception is caused by a bug in OpenJDK that is triggered when it
>> can’t load a required class.
>>
>>
>>
>> Regards,
>>
>> Jeroen
>>
>>
>>
>> *From:* Oliver Egger [mailto:[email protected]]
>> *Sent:* Friday, April 29, 2016 15:23
>> *To:* [email protected]
>> *Subject:* [Ikvm-developers] using ikvm within the context of a dll:
>> java.lang.ClassCastException: Unable to cast object of type
>> 'java.util.PropertyResourceBundle' to type
>> 'sun.util.resources.OpenListResourceBundle'.
>>
>>
>>
>> hi
>>
>>
>>
>> first thanks for that cool product, we are using it with ehealthconnector
>> project to provide a .net api, see
>> https://sourceforge.net/projects/ehealthconnector/
>>
>>
>>
>> but I have a slight problem ...
>>
>>
>>
>> - i have a jar (ehc.jar) converted to a dll with ikvmc (ehc.dll)
>>
>>
>>
>> - when i use the dll within a visual studio .net project and create an
>> executable (ehcdemo.exe) with references to ehc.dll and IKVM.OpenJDK.*.dll
>> the program runs through
>>
>>       ehcdemo.exe
>>
>>            |---------ehc.dll
>>
>>            |---------IKVM.OpenJDK.*.dll
>>
>>
>>
>> - when i try to create a dll instead of the ehcdemo.exe and use that dll
>> (ehcdemo.dll) in my app.exe program i get a java.lang.ClassCastException:
>> Unable to cast object of type 'java.util.PropertyResourceBundle' to  type
>> 'sun.util.resources.OpenListResourceBundle'.
>>
>>
>>
>>       app.exe
>>
>>            |---------ehcdemo.dll
>>
>>                            |---------ehc.dll
>>
>>                            |---------IKVM.OpenJDK.*.dll
>>
>>
>>
>> I can fix above exception if i add all IKVM.OpenJDK.*.dll references
>> directly to my app
>>
>>
>>
>>       app.exe
>>
>>          |---------IKVM.OpenJDK.*.dll
>>
>>          |---------ehcdemo.dll
>>
>>                            |---------ehc.dll
>>
>>                            |---------IKVM.OpenJDK.*.dll
>>
>>
>>
>> however I would like that app.exe has no references directly to the
>> IKVM.OpenJDK.*.dll.
>>
>>
>>
>> Is that possible? If you would have any pointers where to start looking
>> for a solution I would appreciate it very much! I'm not that much a .NET
>> Person so please excuse me if my question is out of topic for ikvm.
>>
>>
>>
>> Best regards
>>
>> Oliver
>>
>>
>>
>> --
>>
>> oliver egger
>>
>>
>>
>> mobile: +41765795005
>>
>> email: [email protected]
>>
>> twitter: @oliveregger <https://twitter.com/oliveregger>
>>
>> http://www.ahdis.ch/
>>
>>
>>
>> ahdis gmbh
>>
>> agile health data information systems
>>
>> bertastrasse 4
>>
>> 8003 zürich
>>
>> switzerland
>>
>>
>>
>>
>>
>> --
>>
>> oliver egger
>>
>>
>>
>> mobile: +41765795005
>>
>> email: [email protected]
>>
>> twitter: @oliveregger <https://twitter.com/oliveregger>
>>
>> http://www.ahdis.ch/
>>
>>
>>
>> ahdis gmbh
>>
>> agile health data information systems
>>
>> bertastrasse 4
>>
>> 8003 zürich
>>
>> switzerland
>>
>
>
>
> --
> oliver egger
>
> mobile: +41765795005
> email: [email protected]
> twitter: @oliveregger <https://twitter.com/oliveregger>
> http://www.ahdis.ch/
>
> ahdis gmbh
> agile health data information systems
> bertastrasse 4
> 8003 zürich
> switzerland
>
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-- 

Regards
Andrew

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