[Laszlo-dev] how to catch the Flex compiler Errors?

[P T Withington]

Even without the debug player, shouldn't the LZX debugger catch the  
runtime error and give at least /some/ information?

I agree with you that Sebastian must have a more subtle error that is  
confusing the compiler, so it would be great if he could create a test  
case.

On Jul 24, 2009, at 14:40, Henry Minsky <hminsky at laszlosystems.com>  
wrote:

> Are you talking about compile time errors or runtime errors?
>
> Can you give an example of a compile time error that stops the  
> compiler?
>
> I tried a simple example like this with a method that the compiler  
> knows
> does not exist at compile time:
>
> <canvas>
>     <text bgcolor="#ccffcc" text="${canvas.runtime}">
>       <handler name="oninit">
>         LzView.nosuchmethod();
>       </handler>
>     </text>
> </canvas>
>
> The error reported does localize properly to the lzx file source  
> code line number
>
>
> The application could not be compiled due to the following errors:
> Compilation Errors
>
> org.openlaszlo.sc.CompilerError: hello.lzx: 4: Error: Call to a  
> possibly undefined method nosuchmethod through a reference with  
> static type Class, in line: LzView.nosuchmethod()
>
> It may be however that your example is doing something that confuses  
> the LPS compiler in a way that it is unable to parse out the flex  
> compiler error message and transform it back to LZX source code  
> filename and line numbers, so it would help to see you specific  
> example.
>
>
> For a runtime error, like below, the compiler does not know whether  
> the
> method exists, because 'canvas' in this example is declared as a  
> dynamic
> variable which may have properties added at runtime:
>
> <canvas>
>     <text bgcolor="#ccffcc" text="${canvas.runtime}">
>       <handler name="oninit">
>         canvas.nosuchmethod();
>       </handler>
>     </text>
> </canvas>
>
>
> But when it runs, it gives a runtime error in the Flash debug player.
>
> TypeError: Error #1006: nosuchmethod is not a function.
>     at $lzc$class_$2Fcanvas$2Ftext/$m4()
>     at Function/http://adobe.com/AS3/2006/builtin::call()
>     at LzEvent/sendEvent()
>     at LzNode/__LZcallInit()
>     at LzCanvas/__LZcallInit()
>     at LzCanvas/__LZinstantiationDone()
>     at LzInstantiatorService/makeSomeViews()
>     at LzInstantiatorService/checkQ()
>     at Function/http://adobe.com/AS3/2006/builtin::call()
>     at LzEvent/sendEvent()
>     at LzIdleKernel$/__update()
>
>
> If runtime errors, are you running with the Flash Debug player?
>
> On Fri, Jul 24, 2009 at 2:24 PM, Sebastian Wagner <seba.wagner at gmail.com 
> > wrote:
> I think you can quite easy make a compiler issue like that cause  
> every time you write in your code a call to a method or attribute  
> that does not exist, that hole Compiler does stop and quite.
>
> thanks,
> sebastian
>
> 2009/7/24 P T Withington <ptw at pobox.com>
>
> Henry and Raju have given lots of hints. I'll just add that when you  
> find out the cause, please file a bug if you can. Clearly we would  
> like this not to happen.
>
>
> On Jul 24, 2009, at 7:28, Sebastian Wagner <seba.wagner at gmail.com>  
> wrote:
>
>> hi,
>>
>> actually you run into a lot of compilation issues when you run a  
>> previous application into SWF9.
>> I followed the SWF9 Migration Guide of course, the code has zero  
>> problems to be compiled to SWF8.
>> I guess in most cases its something very tiny tricky in the code  
>> that needs to be changed but actually you don't get anything except
>> *org.openlaszlo.sc.CompilerError: Errors from compiler, output file  
>> not created*
>> The console does also only pring:
>> FAIL: compiler returned 1 ... or another number
>>
>> So how do you get those Compile Errors?
>> I guess they are not really that handy as they will show you only  
>> errors in the resulting ActionScript that is going to be compiled  
>> by the Flex compiler.
>> So you will not see which LZX-Codeline has the error.
>> But without any notice at which code-block to look at its almost  
>> impossible to migrate more then a bunch of code lines with every  
>> compilation.
>>
>> I've seen that there are some properties in the configuration:
>> compiler.swf9.warnings=false
>> compiler.swf9.execflex=true
>> # Tell compiler to catch errors in debug mode
>> compiler.catcherrors=true
>>
>> changing them does seem to have an effect.
>>
>> Is there a clue that is hidden somewhere or how do you judge what  
>> needs to be done when you run into this?
>>
>> thanks,
>> sebastian
>>
>> -- 
>> Sebastian Wagner
>> http://www.webbase-design.de
>> http://openmeetings.googlecode.com
>> http://www.laszlo-forum.de
>> seba.wagner at gmail.com
>
>
>
>
> -- 
> Sebastian Wagner
> http://www.webbase-design.de
> http://openmeetings.googlecode.com
> http://www.laszlo-forum.de
> seba.wagner at gmail.com
>
>
>
> -- 
> Henry Minsky
> Software Architect
> hminsky at laszlosystems.com
>
>
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