14 Oct
2015
14 Oct
'15
9:11 a.m.
On 14 Oct 2015 at 09:00:15, vincent(a)massol.net
(vincent@massol.net(mailto:vincent@massol.net)) wrote:
On 14 Oct 2015 at 06:43:36, Marius Dumitru Florea
(mariusdumitru.florea@xwiki.com(mailto:mariusdumitru.florea@xwiki.com)) wrote:
Actually, the Component Manager should raise an error if it fails to inject a field. I was
sure it was doing that, strange. I’ll debug it.
Thanks
-Vincent
Hi Debajit,
On Oct 14, 2015 01:17, "Debajit Adhikary" wrote:
Good catch, didn’t see it when I replied yesterday! :)
I guess we could catch this in the AnnotationComponentLoader and report an error.
I created an XWiki component which is available as a jar file.
I have a ScriptService class for the component too:
----
@Role
public interface SearchClient
{
String search();
}
----
@Component
@Singleton
public class InternalSearchClient implements SearchClient
{
public String search()
{
return "test search results";
}
}
----
@Component
@Named("internalSearch")
@Singleton
public class InternalSearchScriptService implements ScriptService
{
@Inject
private InternalSearchClient searchClient;
You need to "inject" the role (interface), not directly the implementation.
That's why you use the Component Manager. Othewise you could have simply
used the "new" operator to instantiate yourself the component. Thanks
-Vincent
Hope this helps,
Marius
>
> public String search()
> {
> return this.searchClient.search();
> }
> }
>
> ----
>
> I've added all the above files into their own jar with a components.txt
> file:
>
> com.mycompany.wiki.search.InternalSearchClient
> com.mycompany.wiki.search.InternalSearchScriptService
>
> and in my Wiki's pom.xml, I have the following:
>
>
> org.xwiki.commons
> xwiki-commons-script
> ${commons.version}
>
>
>
> Now from my Wiki page, when I do the following:
>
> {{groovy}}
> println(services.internalSearch.search())
> {{/groovy}}
>
> I get an error message saying "java.lang.NullPointerException: Cannot
> invoke method search() on null object"
>
> What am I doing wrong here?
>
> (I followed the directions in
> http://platform.xwiki.org/xwiki/bin/view/DevGuide/WritingComponents — have
> these directions changed, and/or is there anything else I need to do? )