Hi,
I have a system configured via Guice 3.0, built up of many services.
Many of these services are configured as eager singletons. Each
service can fail to start up, and throw an exception in its
constructor. The behavior I'd like to get is if any of the services
throws an exception, the whole Guice.createInjector() call should stop
at that point throwing that exception. However, I don't seem to manage
to get this from Guice.
Currently if a low-level service (such as my JdbcConnectionService
that is the basis of all database-based services) fails to start up,
Guice seems to continue to try to instantiate other eager singletons,
and when those ask for the failed low-level service, Guice tries to
instantiate it again.
In the end there are two problems with this:
* I get dozens of exceptions that are hard to decipher. A single
exception with the original problem would be a lot easier to handle.
It's not important for me if it gets wrapped in CreationException/
ProvisionException or not.
* Some of my low-level services have side-effects, like static
registries being initialized. (Yeah, I know, but this is a legacy
project I'm trying to convert.) If their constructor gets called
multiple times, all kinds of problems can arise.
So, to sum it up, all I want is Guice.createInjector() to fail fast
when it encounters a problem creating eager singletons. How can I get
there? I'm not using ThrowingProviders, and it doesn't strike me as
the tool I'd need for the job either. I'd like to inject object
instances, and not juggle around with Providers if I don't have to.
Thanks,
Lorant
PS: Here's a little sample code to demonstrate what I would like to
have. Currently I get 3 errors, and my FaultyService() constructor
gets called three times. What I would like to have is to stop at the
first exception thrown by FaultyService():
import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Scopes;
public class GuiceExceptionsTest {
public static void main(String[] args) {
Guice.createInjector(new AbstractModule() {
@Override
protected void configure() {
bind(Service.class).to(FaultyService.class).asEagerSingleton();
bind(ClassA.class).asEagerSingleton();
bind(ClassB.class).asEagerSingleton();
}
});
// Throws 3 exceptions, one for each class
}
interface Service {}
static class ClassA {
@Inject
ClassA(Service service) {}
}
static class ClassB {
@Inject
ClassB(Service service) {}
}
static class FaultyService implements Service {
static int counter = 0;
FaultyService() {
throw new RuntimeException("Error #" + ++counter);
}
}
}
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