@Nullable doesn't seem to work with @AssistedInject

Question

I have a constructor that looks like this: ``` @Inject public MyClass( @Named("config") String configFile, @Named("template") String templateFile, CachedSettings settings, @Assisted String channelId, @Nullable @Assisted("NetworkA") NetworkInterface localNetworkInterfaceA, @Nullable @Assisted("NetworkB") NetworkInterface localNetworkInterfaceB) { ``` And I get the following error (twice, once for each parameter) ``` 1) null returned by binding at my.company.package.MyClassFactory.create() but parameter 4 of my.company.package.MyClass.() is not @Nullable while locating java.net.NetworkInterface annotated with @com.google.inject.assistedinject.Assisted(value=NetworkA) for parameter 4 at my.company.package.MyClass.(MyClass.java:24) while locating my.company.package.MyClass annotated with interface com.google.inject.assistedinject.Assisted ``` Any idea what is wrong? I found two other questions on this issue, one of them said it was a dependency issue which I don't think I have…

Accepted Answer

`@Nullable` needs to be set on both the constructor as well as the factory declaration. We use `FactoryModuleBuilder` to declare our Factories. I am pasting the relevant bits of code that work for us

The constructor:

```
@Inject
public AddressActions(EC2Service ec2Service,
                      RequestFactory requestFactory,
                      @Assisted("spiceManager") SpiceManager spiceManager,
                      @Assisted("parent") Context parent,
                      @Assisted("publicIp") @Nullable String publicIp) {
```

The Abstract Factory:

```
public static interface Factory {
    AddressActions create(@Assisted("spiceManager") SpiceManager spiceManager,
                          @Assisted("parent") Context context,
                          @Assisted("publicIp") @Nullable String publicIp);
}
```

The Factory Module Builder:

```
install(new FactoryModuleBuilder().build(AddressActions.Factory.class));
```

The call:

```
AddressActions actions = actionsFactory.create(spiceManager, getSherlockActivity(), null);
```

Relevant versions:

- Guice: `guice-3.0-no_aop.jar`

- AssistedInject: `guice-assistedinject-3.0.jar`

- JSR305: `jsr305-1.3.9.jar`

-k

@Nullable doesn't seem to work with @AssistedInject

Solution

Problem