Inconsistent capitalization of pdfRenderingService

[micronax]

When importing the service in a controller the service needs to be named PdfRenderingService but when using in the controller action it must be pdfRenderingService

class SystemController {
    def PdfRenderingService

    def compose_one_for() {
        if (!params?.id) params.id = 1
        def customer = Customer.findById(params.id)
        pdfRenderingService.render(template: "/pdfs/firstLetter", model:[customer:customer], response)
    }
}

When changing the capitalization of pdfRenderingService in one case it wont work.

[yvesf]

Check the 'RenderingTrait' class. The variant pdfRenderingService is automatically injected.
In your example PdfRenderingService serves no purpose.

[micronax]

When I remove this line, I get a NullPointer exception... Using grails 3.0.4