Re: ByteCodeHelper.MapException issue?

Hi Yves,

Unless your C# exception extends java.lang.Exception, it won't be caught. If you want to catch everything you need to catch java.lang.Throwable.

Regards,
Jeroen

> -----Original Message-----
> From: Yves Langisch [mailto:[email protected]]
> Sent: Wednesday, February 3, 2016 14:45
> To: [email protected]
> Subject: [Ikvm-developers] ByteCodeHelper.MapException issue?
> 
> Hi,
> 
> I have a converted Java class which does some threading stuff. My
> Callable implementations are in C#, the executing and control logic is
> in the converted class.
> 
> I catch exceptions in the Callable implementations as follows:
> 
> ...
> catch(java.lang.Exception e) {
>     log.fatal(String.format("Failure running background task. %s",
> e.getMessage()), e);
>     throw e;
> }
> …
> 
> It looks like that not all C# exceptions are properly handled in the
> converted Java class. The snippet above is converted to C# as follows:
> 
> ...
> catch (System.Exception ex)
> {
>   int num = 0;
>   java.lang.Exception exception2 =
> ByteCodeHelper.MapException<java.lang.Exception>(ex,
> (ByteCodeHelper.MapFlags) num);
>   if (exception2 == null)
>   {
>     throw;
>   }
>   else
>   {
>     exception1 = exception2;
>     goto label_9;
>   }
> }
> …
> label_9:
>       java.lang.Exception exception3 = exception1;
>       SessionBackgroundAction.log.fatal((object)
> java.lang.String.format("Failure running background task. %s", (object)
> Throwable.instancehelper_getMessage((System.Exception) exception3)),
> (System.Exception) exception3);
>       throw Throwable.__\u003Cunmap\u003E((System.Exception)
> exception3);
> ...
> 
> When throwing a C# exception in my Callable implementations I expect to
> see the fatal log statement which I do not. Depending on the exception,
> ByteCodeHelper.MapException returns null for all non-Java exceptions.
> 
> java.lang.Exception exception1 =
> ByteCodeHelper.MapException<java.lang.Exception>(new Win32Exception(),
> (ByteCodeHelper.MapFlags)0);
> —> NULL (NOK)
> java.lang.Exception exception2 =
> ByteCodeHelper.MapException<java.lang.Exception>(new
> java.lang.RuntimeException(), (ByteCodeHelper.MapFlags)0);
> —> NOT NULL (OK)
> java.lang.Exception exception3 =
> ByteCodeHelper.MapException<java.lang.Exception>(new System.Exception(),
> (ByteCodeHelper.MapFlags)0);
> —> NULL (NOK)
> 
> I expect to see the log statement in all cases. Am i overlooking
> anything?
> 
> Best,
> Yves
> 
> 
> 
> 
> 
> 
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