How to use g.formatNumber in grails Service class

Question

I want to use g.formatNumber in service, I have tried a below method, Which i got online. This is not working, its giving me the error "Cannot invoke method formatNumber() on null object", The code is below

    import org.springframework.beans.factory.InitializingBean

    class MyService implements InitializingBean {
        boolean transactional = false
        def gspTagLibraryLookup  // being automatically injected by spring
        def g

        public void afterPropertiesSet() {
            g = gspTagLibraryLookup.lookupNamespaceDispatcher("g")
            assert g
        }

      def getFormattedNumber(){
       def number = g.formatNumber(number: 5000,234 , type: "number" , maxFractionDigits: 2)
       return number
     }
}

How to do this.

I don't think the problem lies in formatNumber(). Could you check if _g_ is null inside getFormattedNumber()? — Hernán Erasmo, Jan 07 '14 at 11:59

score 7 · Answer 1 · answered Jan 07 '14 at 13:18

I want to use g.formatNumber in service

Rather than jumping through the hoops you need to use a taglib within a service, it would be simpler to just use java.text.NumberFormat directly

NumberFormat format = NumberFormat.getNumberInstance()
format.maximumFractionDigits = 2
def number = format.format(5000.234)

If the service method is being called from a web request handling thread then you may wish to use the LocaleContextHolder to get the correct locale for the current web request, rather than just using the server's default.

Yes, This is always a solution But for using especially g tag in service was my question — n92, Jan 08 '14 at 13:32

score 2 · Answer 2 · answered Feb 04 '16 at 17:14

2

This should work

def g = grailsApplication.mainContext.getBean('org.codehaus.groovy.grails.plugins.web.taglib.ApplicationTagLib');

You will of course need grailsApplication injected by defining it ala

def grailsApplication

answered Feb 04 '16 at 17:14

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From grails 2.1 `import groovy.xml.MarkupBuilder def g = Holders.grailsApplication.mainContext.getBean('org.codehaus.groovy.grails.plugins.web.taglib.ApplicationTagLib')` – Hassan ALAMI Jun 18 '19 at 14:57
1

in grails 4.0.13 `def g = grailsApplication.mainContext.getBean('org.grails.plugins.web.taglib.ApplicationTagLib');` worked for me – dcdrns Dec 01 '22 at 10:40

How to use g.formatNumber in grails Service class

2 Answers2