Oracle Exam 1Z0-900 Topic 2 Question 61 Discussion

Actual exam question for Oracle's 1Z0-900 exam

Question #: 61
Topic #: 2

[All 1Z0-900 Questions]

Given the code sample:

And:

And the next fragment from beans.xml:

And this injection point:

@Inject GenericMessenger messageHandler;

Which type would be injected at run time and referenced by the messageHandler variable?

ASmsHandler

BMsgHandler

CNone of the above. An exception would be thrown due to ambiguous bean references.

DGenericMessenger

Show Suggested Answer

Suggested Answer: B

by Jennifer at Mar 31, 2023, 10:17 AM

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Anastacia

5 days ago

Haha, this question is like a game of 'guess the bean'. I'm going to go with C and pray for the best. Ambiguous bean references are the bane of every Java developer's existence.

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Tambra

6 days ago

I bet the answer is D. GenericMessenger. The injection point is using that interface, so it should just return the base interface implementation, right? *scratches head*

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Lucy

13 days ago

Definitely C. An exception would be thrown. How are we supposed to know which implementation to choose when there are multiple beans of the same type? This is a tricky one!

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Truman

18 days ago

Hmm, you might be right. I guess it depends on how the beans are configured in the application context.

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Vannessa

23 days ago

I'm going with B. MsgHandler. The code samples show that MsgHandler implements GenericMessenger, and it's the only one that matches the injection point.

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Elza

24 days ago

Hmm, I think the answer is C. The beans.xml configuration seems to have multiple beans that implement the GenericMessenger interface, so there would be an ambiguous bean reference exception.

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Fatima

24 days ago

I disagree, I believe the answer is D) GenericMessenger because that's the type specified in the injection point.

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Truman

27 days ago

I think the answer is A) SmsHandler because it matches the type of the injected variable.

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