Re: Help with @Inject, for some reason it doesn't work.

[Stephan Classen]

The question is:

How are you creating the instance of Blob?
Most likely the instance of Blob was not created by guice. This happens 
when you call "new". In order to have guice create the instance you must 
do either one of the following:
- ask the injector for an instance -- injector.getInstance(Blob.class)
- have Blob injected into another class.

To avoid such situations it is always a possibility to use constructor 
injection instead of field injection:

public class Blob {
    private final Applications applications;

    @Inject
    Blobb(Applications applications) {
        this.applications = applications;
    }

.....
}

Now the compile will force you to pass an instance of Applications when 
you call new Blob.
Guice will happily pass all arguments to the constructor annotate with 
@Inject.





On 24.05.2018 15:49, po...@mailarchiva.ru wrote:

I have a class i wan't inject
For legacy code support it is like this.

    @Singleton
    public class Applications extends AbstractModule {
        private Applications() {}
        private static class ApplicationsLoader {
            static final Applications INSTANCE = new Applications();
        }
        @Override    protected void configure() {}
        @Provides @Singleton
        public Applications get() {
            return ApplicationsLoader.INSTANCE;
        }
       public static Applications getApps() {
            return ApplicationsLoader.INSTANCE;
        }
    }

On application startup , I create injector.

    public void startup() throws Exception {
    initLogging();
    Injector injector = Guice.createInjector(Stage.PRODUCTION,
    Applications.getApps());
    }

but some while after, when I need Applications.class i always get a null

    public class Blob {
        @Inject private Applications applications;
    .....
    }

Any suggestions how to share Applications.class singleton?
injector.getInstance(Applications.class) working fine.

Regards,

Valentin.

--
You received this message because you are subscribed to the Google 
Groups "google-guice" group.
To unsubscribe from this group and stop receiving emails from it, send 
an email to google-guice+unsubscr...@googlegroups.com 
<mailto:google-guice+unsubscr...@googlegroups.com>.
To post to this group, send email to google-guice@googlegroups.com 
<mailto:google-guice@googlegroups.com>.
Visit this group at https://groups.google.com/group/google-guice.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/google-guice/d02fdaa7-59e9-4b4e-8f47-4a43a04d53db%40googlegroups.com 
<https://groups.google.com/d/msgid/google-guice/d02fdaa7-59e9-4b4e-8f47-4a43a04d53db%40googlegroups.com?utm_medium=email&utm_source=footer>.
For more options, visit https://groups.google.com/d/optout.

--
You received this message because you are subscribed to the Google Groups 
"google-guice" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to google-guice+unsubscr...@googlegroups.com.
To post to this group, send email to google-guice@googlegroups.com.
Visit this group at https://groups.google.com/group/google-guice.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/google-guice/6e966ba5-10cf-59a1-dad4-c604df112767%40gmx.ch.
For more options, visit https://groups.google.com/d/optout.