On 25/02/2013 18:49, Scott Ferguson wrote: > On 2/24/13 2:54 PM, c.whalley wrote: >> On 24/02/2013 17:21, Scott Ferguson wrote: >>> On 2/24/13 2:06 AM, c.whalley wrote: >>>> On 24/02/2013 05:49, Dan Ziegelbein wrote: >>>>> The reason you're getting NPE's is that your instances of APICommand are >>>>> not themselves injected by the container (you are instantiating them in >>>>> code somewhere...indicated by the fact that APICommand has a >>>>> non-injected parameterized constructor). >>>>> >>>>> Dan >>>> Hi Dan & thanks for this, >>>> >>>> I looked more at this and realised I need to do as you say, and it seems >>>> I need Webbeans and the @Component annotation, plus token >>>> META-INF/web-beans.xml to mark it as so? If that's right, I'm now >>>> struggling to even get the @Component to resolve - does the webbeans >>>> package come with Resin or is it an external download? >>> For Resin 4.0, it's CDI and all the names changed: >>> >>> the magic file in META-INF/beans.xml in a jar or WEB-INF/beans.xml for >>> the WEB-INF/classes. The smallest content of that file "<beans/>". >>> >>> You don't need an annotation on the bean, but you can use something like >>> @javax.inject.Singleton if you want it to be a single instance. The >>> default behavior instantiates a new instance of your bean at each >>> @Inject point. >>> >>> -- Scott >> Umm ... I hope I read you right - I just added beans.xml to WEB-INF with >> just "<beans/>" as its content and that ut is still null. >> I did change it slightly from the code I posted earlier to ensure it >> really is a bean, in case that was significant: > How are you instantiating APICommand? > > For example, are you injecting it into your servlet? > > If you used "new APICommand()", CDI wouldn't be invoked, because it's > not doing that kind of bytecode generation on the constructor. > > Two general patterns are: > @Inject APICommand _command; // injecting into another bean > @Inject Instance<APICommand> _factory; // creates a factory to return > new instances That was it - much clearer now, thanks & it all working beautifully;-)
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