Hello everyone.
I'm trying to create a Singleton to be used by Guice, and still remain to
be used as classical Singleton (it's a new jar for a bigger project, and we
currently don't support DI, but we will in the future).
So i have a Interface like
@ImplementedBy(MyClassImpl.class)
public interface IMyClass {
boolean returnTrue();
}
I now have the implementation with a private constructor:
@Singleton
public class MyClassImpl implements IMyClass {
private MyClassImpl() {}
@Provides
@Singleton
public static MyClassImpl getInstance() {
if (instance == null) {
instance = new PermissionDecisionMakerImpl();
}
return instance;
}
@Override
boolean returnTrue() {
return true;
}
}
As you see, i already tried with the Annotations to have the Singleton to
be automaticly found by the Injector.
When i do:
(Guice.createInjector().getInstance(IMyClass.class)
i get the Exception:
Could not find a suitable constructor in MyClassImpl. Classes must have
either one (and only one) constructor annotated with @Inject or a
zero-argument constructor that is not private.
at MyClassImpl.class(MyClassImpl.java:??)
while locating IMyClass
What do i do wrong?
I know, i can use toInstance within the Module, but i wanted just to use
Annotations. Is there a way to get this running?
Regards,
-Rainer
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