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<a name="Exceptions"></a>
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Next: <a href="Pragma-Asynchronous.html#Pragma-Asynchronous" accesskey="n" rel="next">Pragma Asynchronous</a>, Previous: <a href="RPC-Failures.html#RPC-Failures" accesskey="p" rel="prev">RPC Failures</a>, Up: <a href="More-About-Categorization-Pragmas.html#More-About-Categorization-Pragmas" accesskey="u" rel="up">More About Categorization Pragmas</a> &nbsp; [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Exceptions-1"></a>
<h4 class="subsubsection">8.1.7.3 Exceptions</h4>

<p>Any exception raised in a remote method or subprogram call is propagated
back to the caller. Exception semantics are preserved in the regular
Ada way.
</p>
<div class="smallexample">
<pre class="smallexample">
<b>package</b> Internal <b>is</b>
   Exc : <b>exception</b>;
<b>end</b> Internal;

</pre></div>
<div class="smallexample">
<pre class="smallexample">
<b>package</b> RemPkg2 <b>is</b>
   <b>pragma</b> Remote_Call_Interface;

   <b>procedure</b> Subprogram;
<b>end</b> RemPkg2;

</pre></div>
<div class="smallexample">
<pre class="smallexample">
<b>package</b> RemPkg1 <b>is</b>
   <b>pragma</b> Remote_Call_Interface;

   <b>procedure</b> Subprogram;
<b>end</b> RemPkg1;

</pre></div>

<p>Let us say that RemPkg2, Internal and RemExcMain packages are on the same
partition Partition_1 and that RemPkg1 is on partition Partition_2.
</p>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> RemPkg1, Ada.Exceptions; <b>use</b> Ada.Exceptions;
<b>package</b> <b>body</b> RemPkg2 <b>is</b>
   <b>procedure</b> Subprogram <b>is</b>
   <b>begin</b>
      RemPkg1.Subprogram;
   <b>exception</b> <b>when</b> E : <b>others</b> =&gt;
      Raise_Exception (Exception_Identity (E), Exception_Message (E));
   <b>end</b> Subprogram;
<b>end</b> RemPkg2;

</pre></div>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> Internal, Ada.Exceptions; <b>use</b> Ada.Exceptions;
<b>package</b> <b>body</b> RemPkg1 <b>is</b>
   <b>procedure</b> Subprogram <b>is</b>
   <b>begin</b>
      Raise_Exception (Internal.Exc'Identity, &quot;Message&quot;);
   <b>end</b> Subprogram;
<b>end</b> RemPkg1;

</pre></div>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> Ada.Text_IO, Ada.Exceptions; <b>use</b> Ada.Text_IO, Ada.Exceptions;
<b>with</b> RemPkg2, Internal;
<b>procedure</b> RemExcMain <b>is</b>
<b>begin</b>
   RemPkg2.Subprogram;
<b>exception</b> <b>when</b> E : Internal.Exc =&gt;
   Put_Line (Exception_Message (E)); -- Output &quot;Message&quot;
<b>end</b> RemExcMain;

</pre></div>

<p>When RemPkg1.Subprogram on Partition_1 raises Internal.Exc, this
exception is propagated back to Partition_2. As Internal.Exc is not
defined on Partition_2, it is not possible to catch this exception
without an exception handler <b>when others</b>. When this exception is
reraised in RemPkg1.Subprogram, it is propagated back to Partition_1. But
this time, Internal.Exc is visible and can be handled as we would in a
single-partition Ada program. Of course, the exception message is also
preserved.
</p>




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