Re: [eclipse-clp-users] Java error messages

From: Gregory Harman <greg_at_...171...>
Date: Wed, 4 Mar 2009 00:24:29 -0500
Thanks, Joachim. I've been using EmbeddedEclipse, but with queues  
since I need to get a result out that can't come as a goal variable  
due to the Java interface's substitution of nulls for anonymous  
variables. I suppose I could grab stderr for this purpose - I was just  
expecting a thrown exception (Throw) to come with a message - on the  
Java side, that's really the right place for it.

-Greg

On Mar 3, 2009, at 8:39 PM, Joachim Schimpf wrote:

> Paul Davern wrote:
>> Hello Gregory,
>>
>> In my experience of using the Java interface you can get no more  
>> information
>> than "there was an error". However, the error usually indicates  
>> that ECLiPSe
>> is unhappy with the goal you sent it and tells you so; except as  
>> far as I am
>> aware the Java interface swallows the message.
>
> If you use an EmmbeddedEclipse, you should see the error messages
> (provided you don't set the UseQueues option):
>
> import com.parctechnologies.eclipse.*;
> import java.io.*;
> public class ErrTest
> {
>   public static void main(String[] args) throws Exception
>   {
>     EclipseEngineOptions eclipseEngineOptions = new  
> EclipseEngineOptions();
>     EclipseEngine eclipse =  
> EmbeddedEclipse.getInstance(eclipseEngineOptions);
>     eclipse.rpc("no_such_predicate");
>   }
> }
>
> % javac -classpath /home/jschimpf/Eclipse/6.0_65/lib/eclipse.jar  
> ErrTest.java
> % java -classpath /home/jschimpf/Eclipse/6.0_65/lib/eclipse.jar:.
> -Declipse.directory=/home/jschimpf/Eclipse/6.0_65 ErrTest
> calling an undefined procedure no_such_predicate in module eclipse   
> <<<<HERE
> Exception in thread "main" com.parctechnologies.eclipse.Throw
>
>
>
> In OutOfProcessEclipse, some flushing was missing.  I have fixed this
> just now, but you can work around the problem by adding the line
> eclipse.rpc("set_stream_property(error,flush,end_of_line)");
> immediately after initialising your eclipse:
>
> import com.parctechnologies.eclipse.*;
> import java.io.*;
> public class ErrTest
> {
>   public static void main(String[] args) throws Exception
>   {
>     EclipseEngineOptions eclipseEngineOptions = new  
> EclipseEngineOptions();
>     OutOfProcessEclipse eclipse = new  
> OutOfProcessEclipse(eclipseEngineOptions);
>     eclipse.rpc("set_stream_property(error,flush,end_of_line)");
>     eclipse.rpc("no_such_predicate");
>   }
> }
>
> % javac -classpath /home/jschimpf/Eclipse/6.0_65/lib/eclipse.jar  
> ErrTest.java
> % java -classpath /home/jschimpf/Eclipse/6.0_65/lib/eclipse.jar:.
> -Declipse.directory=/home/jschimpf/Eclipse/6.0_65 ErrTest
> calling an undefined procedure no_such_predicate in module eclipse    
> <<<<HERE
> Exception in thread "main" com.parctechnologies.eclipse.Throw
>
>
> -- Joachim
>
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Received on Wed Mar 04 2009 - 05:24:50 CET

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