This looks like the bug fixed by http://code.google.com/p/google-guice/source/detail?r=6b7e7187bd074d3f2df9b04e17fa01e7592f295c (issue http://code.google.com/p/google-guice/issues/detail?id=627).
It seems to be a super old bug that's been present at least since Guice 2 and possibly before. The test added in the fix should explain what causes it. sam On Fri, Oct 21, 2011 at 1:08 PM, Michael Burton <[email protected]> wrote: > A user of RoboGuice ran into the following error awhile back. As best we > can tell, it appears this might be a bug in Guice3? Can anyone explain what > might be the issue if we're doing anything wrong? > > Here's the code: > > import com.google.inject.AbstractModule; > import com.google.inject.Guice; > import com.google.inject.Inject; > import com.google.inject.Provider; > import com.google.inject.TypeLiteral; > import com.google.inject.matcher.Matchers; > import com.google.inject.spi.TypeEncounter; > import com.google.inject.spi.TypeListener; > > public class GuiceTest { > > public static void main(String[] args) { > TestApp testApp = new TestApp(); > Guice.createInjector(new MyModule1(testApp), new MyModule2(testApp)); > } > > private static class BaseApp { > } > > > // Extends BaseApp > private static class TestApp extends BaseApp { > } > > > > private static class MyModule1 extends AbstractModule { > > private final BaseApp app; > > public MyModule1(BaseApp app) { > this.app = app; > } > > @Override > protected void configure() { > bind(BaseApp.class).toInstance(app); > bindListener(Matchers.any(), new MyListener()); > requestStaticInjection(SomeOtherClass.class); > } > } > > private static class MyModule2 extends AbstractModule { > > private final TestApp app; > > public MyModule2(TestApp app) { > this.app = app; > } > > // Does nothing other than binding app to TestApp, which is a binding > that's never used > @Override > protected void configure() { > bind(TestApp.class).toInstance(app); > } > } > > // Just an empty listener > private static class MyListener implements TypeListener { > public <I> void hear(TypeLiteral<I> iTypeLiteral, TypeEncounter<I> > iTypeEncounter) { > } > } > > private static class SomeOtherClass { > > @Inject static BaseApp app; > > } > } > > > > > When you compile and run, you'll get the following error: > > $ javac -cp > /Users/mike/.m2/repository/javax/inject/javax.inject/1/javax.inject-1.jar:/Users/mike/.m2/repository/com/google/inject/guice/3.0/guice-3.0-no_aop.jar:/Users/mike/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar > GuiceTest.java > $ java -cp > /Users/mike/.m2/repository/javax/inject/javax.inject/1/javax.inject-1.jar:/Users/mike/.m2/repository/com/google/inject/guice/3.0/guice-3.0-no_aop.jar:/Users/mike/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar:. > GuiceTest > > Exception in thread "main" com.google.inject.CreationException: Guice > creation errors: > > 1) Error in custom provider, java.lang.NullPointerException > at GuiceTest$MyModule1.configure(GuiceTest.java:37) > while locating GuiceTest$BaseApp > for field at GuiceTest$SomeOtherClass.app(Unknown Source) > > 1 error > at > com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:435) > at > com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:175) > at > com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:109) > at com.google.inject.Guice.createInjector(Guice.java:95) > at com.google.inject.Guice.createInjector(Guice.java:72) > at com.google.inject.Guice.createInjector(Guice.java:62) > at GuiceTest.main(GuiceTest.java:14) > Caused by: java.lang.NullPointerException > at > com.google.inject.internal.Initializer$InjectableReference.get(Initializer.java:147) > at com.google.inject.internal.ConstantFactory.get(ConstantFactory.java:35) > at > com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) > at > com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) > at > com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) > at com.google.inject.Scopes$1$1.get(Scopes.java:65) > at > com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) > at > com.google.inject.internal.SingleFieldInjector.inject(SingleFieldInjector.java:53) > at > com.google.inject.internal.InjectionRequestProcessor$StaticInjection$1.call(InjectionRequestProcessor.java:116) > at > com.google.inject.internal.InjectionRequestProcessor$StaticInjection$1.call(InjectionRequestProcessor.java:110) > at > com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024) > at > com.google.inject.internal.InjectionRequestProcessor$StaticInjection.injectMembers(InjectionRequestProcessor.java:110) > at > com.google.inject.internal.InjectionRequestProcessor.injectMembers(InjectionRequestProcessor.java:78) > at > com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:170) > ... 5 more > > > Cheers, > Mike > > -- > You received this message because you are subscribed to the Google Groups > "google-guice" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/google-guice/-/CxXJN4nQwCsJ. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-guice?hl=en. > -- You received this message because you are subscribed to the Google Groups "google-guice" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-guice?hl=en.
