Misleading error message if snippet returns null

[wei...@react.uni-saarland.de]

Hello everybody,

lately I’ve encountered some odd behavior of Lift. Namely, if a snippet returns null, the following error message appears in development mode: … While technically correct (I think), in my opinion, that error message is misleading, since the method was indeed found, but returned null instead of some actual NodeSeq. Would it be possible to change the error message in future versions to reflect that? I first encountered the problem with Lift 2.5.1, but the problem persists in Lift 3.0-RC3.

I’ve attached a sample project that exhibits the behavior. Just type `sbt ~container:start` and navigate to 127.0.0.1:8080 to see the error message. The snippet is implemented in `src/main/scala/code/snippet/HelloWorld.scala`.

Should I open a ticket for this, or is this intended behavior?

Alex

[Diego Medina]

is the error  really 

...

or did you forget to paste the error?

also, while it may be the same for you, we prefer if you post sample projects on github following these instructions: (they could be a bit outdated, but mainly, post them to github which is easier for us to work with)

https://www.assembla.com/wiki/show/liftweb/Posting_example_code

Thanks

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Diego Medina
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[wei...@react.uni-saarland.de]

Darn, prepared the message while being offline and didn't proofread before I sent it. Sorry about that, I will update it shortly with the correct error message and a github link.

Alex

[wei...@react.uni-saarland.de]

Ok, here we go again. The actual error is as follows:

Error processing snippet: mysnippet.method
Reason: Method Not Found
There are possible matching methods ( method ), but none has the required signature:

def
                                  method
                                  (in: NodeSeq): NodeSeq

XML causing this error:

          <lift:mysnippet.method xmlns="http://www.w3.org/1999/xhtml"> 
    </lift:mysnippet.method>

I've committed the project to https://github.com/aweinert/liftweb-null-snippet. The readme contains the steps necessary for reproduction.

Alex

On Wednesday, May 18, 2016 at 9:15:53 AM UTC+2, fmpwizard wrote:

[Antonio Salazar Cardozo]

Yes, 100% think we should improve this. Can you file an issue? Those snippet errors

have a lot of interesting corner cases where they aren't quite as informative as they could

be, and improving them is something I've been wanting to do for a while :)

Thanks,

Antonio

[wei...@react.uni-saarland.de]

Done, I've posted an issue at https://github.com/lift/framework/issues/1799

Thanks for your response,

Alex