问题
Grails Version: 3.0.7
Groovy Version: 2.4.4
JVM Version: 1.8.0_51
I must be missing something really simple here.
I've added a grails plugin to my project as defined in the read me :
compile 'org.grails.plugins:geocode:0.3'
I can see the relevant dependencies have been pulled down from the repository.
However, when trying to inject the service within my controller using :
def geocodingService
I receive the following error upon execution :
Caused by: java.lang.NullPointerException: Cannot invoke method getPoint() on null object
The relevant line of code is :
Point location = geocodingService.getPoint('XXX XXX, UK')
My guess is the dependancy injection is failing but can anybody please tell me the mistake I am making?
回答1:
Note : Copied my answer from another almost identical questions ...
OK, this seems to be down to me stupidly trying to use a grails 2.x plugin in a grails 3.x plugin.
There are various steps to go through to upgrade a plugin from 2.x to 3.x all detailed within the grails documentation.
My immediate solution was to simply create a new service and copy the code from the plugin into my application. Worked just fine.
Grails 3.x plugins : https://bintray.com/grails/plugins Grails 2.x plugins : https://grails.org/plugins/
It's not obvious unless you navigate via the grails site. If you come in for example from Google directly to a plugin page, compatibility is shown as 2.5.x >
However, this actually seems to mean greater than 2.5.x but less than 3.x
Hope this helps should anyone else encounter this.
来源：https://stackoverflow.com/questions/34394977/grails-geocode-plugin-dependency-injection-issue