2015-02-27 11:34 GMT+01:00 Gary Verhaegen <gary.verhae...@gmail.com>:
> It means the Clojure compiler cannot emit the efficient bytecode directly,
> so it emits bytecode that calls the method reflexively.
>
> This only impacts performance, so if that code is not used much, it is not
> a problem.
>
It is not used much, so it should not be a real problem.
> The underlying problem is that jvm bytecode is typed, so ideally the
> bytecode should be able to say "call method M of type T on object O". Here,
> the Clojure Compiler cannot infer a type for html-table, so instead the
> emitted bytecode is more along the lines of "ask object O to give a list of
> all of its types, then look into each of these types to find if one has a
> method that matches M in terms of name and number of arguments, and then
> look at that method's signature and check if the arguments can be cast to
> the types of the formal parameters; if there is a type with such a method,
> invoke that method".
>
> This is not 100% technically accurate (in particular, i have no idea what
> reflection does about the arguments and their types in this case), but it
> should be roughly correct and you can easily see why that would be much
> slower.
>
> If you want to remove that warning, you can annotate the html-table
> variable, but the place where you must do that will depend on a little more
> context than what you've given here. It is usually done at the level of var
> declaration or in function argument lists.
>
This is the code:
(let [html-table (editor-pane
:content-type "text/html"
:text (str html-start
html-records
html-end))
]
(.setCaretPosition html-table 0)
So html-table is a JEditorPane. Should Clojure not be able to determine
that?
Just to satisfy my curiosity: how can I get rid of the warning?
On Friday, 27 February 2015, Cecil Westerhof <cldwester...@gmail.com> wrote:
> On a editor-pane I use:
>> (.setCaretPosition html-table 0)
>>
>> And it does what it should do. But when I run:
>> lein check
>>
>> I get:
>> Reflection warning, quotes/core.clj:98:42 - call to method
>> setCaretPosition can't be resolved (target class is unknown).
>>
>> Is that something to worry about?
>>
>> By the way, I get also some on jdbc and seesaw.
>>
>
Strange enough I only get the warnings on my own code now.
--
Cecil Westerhof
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