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
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