Grails 3 static compilation of taglib

Question

I'm trying to apply @GrailsCompileStatic to taglib and geting the following error:

Error:(19, 16) Groovyc: [Static type checking] - Cannot find matching method com.tempvs.image.MyTagLib#render(java.util.LinkedHashMap ). Please check if the declared type is right and if the method exists.

Code example:

@GrailsCompileStatic
class MyTagLib {
    ...
    String myTag = { Map attrs ->
        ...
        out << render(template: '/templates/myTemplate', model: [...])
    }
}

What am I doing wrong and how can I solve the problem?

Why are you trying to statically compile your taglib? That seems like what you might be doing wrong...but if you can explain why you need it, perhaps someone here can help find a solution that will work for you! — Daniel, Jul 10 '17 at 16:05
@Daniel, I use no groovy dynamic features in my taglib and would prefer to improve the performance. — Anton Hlinisty, Jul 11 '17 at 14:14

score 3 · Accepted Answer · answered Jul 11 '17 at 15:53

You are using some dynamic features, because taglibs in general do use them. Even just calling "render" is in a sense dynamic.

If you really want to, you can work around this by injecting a PageRenderer and using that to render your page, and then outputting the resulting HTML. I'm not sure it would be worth it, but I certainly don't know your performance requirements!

Example:

import grails.compiler.GrailsCompileStatic
import grails.gsp.PageRenderer

@GrailsCompileStatic
class StaticTestTagLib {

    static namespace = "staticTest"

    PageRenderer groovyPageRenderer

    String myTag = { Map attrs ->
        out << groovyPageRenderer.render(template: '/templates/myTemplate', model: [...])

    }
}

This works, but you will have some work ahead of you if your taglib is doing anything remotely complex, because EVERY call to render, or any other tag is going to have to be replaced by a statically compiled call. It's possible, but possibly not hugely beneficial.

Thanks, it works, but now I have problems with the related unit-tests :) — Anton Hlinisty, Jul 12 '17 at 20:07

score 0 · Answer 2 · answered Jul 11 '17 at 21:41

0

I am not sure what is the point in creating a new tag that just renders a template.

Grails already has a tag library that renders a template.

   <g:render template="displaybook" model="['book':book,'author':author]" />

https://docs.grails.org/latest/ref/Tags/render.html

answered Jul 11 '17 at 21:41

elixir

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Presumably it's doing more than the simplified-for-stackoverflow example shows. I certainly hope so anyway! :-) – Daniel Jul 12 '17 at 20:25

Grails 3 static compilation of taglib

2 Answers2