Proper way to register and use provider in module

[Paul Fullbright]

I'm trying to figure out the proper way to configure providers and then also use them in modules.

I have this class:

public class Initializer

extends AbstractModule {

private static final Logger logger = LoggerFactory.getLogger(Initializer.class);

private Environment env;

private Config config;

public Initializer(Environment env, Config config) {

this.env = env;

this.config = config;

}

@Override

protected void configure() {

bind(ClientFactoryBean.class).toProvider(ClientFactoryBeanProvider.class).asEagerSingleton();

        

try {

ClientFactoryBean clientFactory = getProvider(ClientFactoryBean.class).get();

Client client = clientFactory.create(config.getString("adminUser"), config.getString("adminPassword"));

// do client configuration

} catch (Exception e) {

logger.error("Error initializing", e);

}

}

}

But I get this error:

[error] c.g.u.m.Initializer - Error initializing

java.lang.IllegalStateException: This Provider cannot be used until the Injector has been created.

        at com.google.common.base.Preconditions.checkState(Preconditions.java:456)

        at com.google.inject.spi.ProviderLookup$1.get(ProviderLookup.java:102)

        at c.g.u.m.Initializer.configure(Initializer.java:39)

        at com.google.inject.AbstractModule.configure(AbstractModule.java:62)

        at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340)

        at com.google.inject.spi.Elements.getElements(Elements.java:110)

        at com.google.inject.util.Modules$OverrideModule.configure(Modules.java:177)

        at com.google.inject.AbstractModule.configure(AbstractModule.java:62)

        at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:340)

        at com.google.inject.spi.Elements.getElements(Elements.java:110)

How am I supposed to properly initialize and use a provider as part of a module configuration?

Thanks,

[Greg Methvin]

Since you are using Guice it may help to read https://github.com/google/guice/wiki/ProviderBindings or https://github.com/google/guice/wiki/ProvidesMethods.

You should not be doing any initialization in the configure method. That's only for configuring bindings.

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[Paul Fullbright]

OK, that is basically how I have implemented my provider for my Client class. Question though, if I'm not supposed to do any initialization in my module, how am I supposed to do initialization? Isn't that how Flyway does db initialization?

[Greg Methvin]

You do the initialization in a bound Provider or in a @Provides method.

Greg

---

From: play-fr...@googlegroups.com <play-fr...@googlegroups.com> on behalf of Paul Fullbright <pwfull...@gmail.com>
Sent: Friday, February 23, 2018 12:37:18 PM
To: Play Framework
Subject: Re: [play-framework] Proper way to register and use provider in module

 

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[Paul Fullbright]

So how do you make sure it runs at startup? Or how do you control the order of invocation of Providers?

[Greg Methvin]

You can bind your Provider as an eager singleton to force it to run on startup.

The order of invocation is determined by dependencies. If A depends on B, then B's provider is called first.

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