There's no instruction to the Injector telling it to Inject the
instance of your TemplateTest class. If you add an additional module
to the Injector, something like:
new AbstractModule() { public void configure() { requestInjection(this); } }
then Guice will know to process @Inject methods/variables within
TemplateTest too.
Sam
On Tue, Mar 2, 2010 at 6:40 PM, infinity2heaven <[email protected]> wrote:
> New to guice.
>
> public interface Template {
> foo();
> }
>
> public class SomeTemplate implements Template {
> �...@inject
> public SomeTemplate (Session session){
> this.session = session;
> }
>
> public foo() {
> // do something
> }
> }
>
> // Module with bindings
> public class TemplateModule extends AbstractModule {
>
> �...@override
> protected void configure() {
> bind(Session.class).toInstance(session);
> bind(Template.class).to(SomeTemplate.class);
> }
>
> public static class Builder {
> private Session session;
>
> public TemplateModule buildModule() {
> return new TemplateModule(session);
> }
>
> public Builder withSession(String session) {
> this.session = session;
> return this;
> }
> }
> }
>
> // JUnt 4.4 test
> public class TemplateTest {
>
> �...@inject
> Template template; // doesn't inject!
>
> �...@beforeclass
> public static void init() throws Exception {
> injector = Guice.createInjector(new
> TemplateModule.Builder().withSession(new Session()));
> // template= injector.getInstance(Template.class); // template
> is
> initialized if this is uncommented
> }
>
> �...@test
> public void testFoo() {
> template.foo(); // NullPointerException
> }
>
> }
>
> What is wrong with the above code? Why doesn't @Inject automatically
> inject the template instance variable? It seems redundant (and
> limited) that I have to yet again use Injector.getInstance, each time
> I need to access the template object. I'm sure doing something wrong
> here ...
>
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