Comment #2 on issue 627 by joshgr: Bug in
com.google.inject.internal.Initializer
http://code.google.com/p/google-guice/issues/detail?id=627
I'm witnessing the same issue (intermittently) in a codebase that also
combines Jackson JSON with Guice. I don't have an isolated reproduction to
offer, but I can add some additional context that I hope may help track
down the cause:
I've noticed that the error occurs inside of a call to
Injector.getInstance() which is invoked *within* the constructor of a
guice-managed eager singleton: I have a singleton whose constructor loads
some JSON configuration; during the JSON deserialization, we call
injector.getInstance(...) to populate a field on a deserialized
configuration object (this is perhaps a bad idea, but I would at least hope
for more clear exception if we're doing something wrong). This has worked
for us in the past, but some recent change is frequently (but not always?!)
resulting in a NPE (see below for the stacktrace).
One more note: the eagerSingleton constructor is actually being invoked A
SECOND TIME when the exception is thrown; a breakpoint at the top of the
constructor is hit twice prior to the exception. I can't explain this; I
wasn't able to locate any circular dependencies in this area of the code.
Hope this helps!
1) Error in custom provider, java.lang.NullPointerException
1 error
at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:987)
at
com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1009)
[... context elided ...]
Caused by: java.lang.NullPointerException
at
com.google.inject.internal.Initializer$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$1.get(Scopes.java:65)
at
com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40)
at
com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38)
at
com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62)
at
com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:84)
at
com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254)
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$1.get(Scopes.java:65)
at
com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40)
at
com.google.inject.internal.SingleFieldInjector.inject(SingleFieldInjector.java:53)
at
com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:110)
at
com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:94)
at
com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254)
at
com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978)
at
com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031)
at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974)
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