- A
login()
Why wrong: login() validates credentials; commit() follows.
- B
initialize()
Why wrong: initialize() is for initializing the LoginModule, not for committing.
- C
commit()
commit() commits the authentication and associates principals with the Subject.
- D
abort()
Why wrong: abort() is used to clean up if authentication fails.
Question 238 of 519
1Z0-829 Java I/O API and Securing Applications Practice Question
This 1Z0-829 practice question tests your understanding of java i/o api and securing applications. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In a JAAS login module, after the login() method returns true, which method must be called to commit the authentication and add principals to the Subject?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
commit()
In a JAAS login module, after the `login()` method returns `true`, the `commit()` method must be called to associate the authenticated principals and credentials with the `Subject`. The `commit()` method is responsible for adding the successfully authenticated principals to the Subject, making them available for subsequent authorization checks. This is part of the two-phase authentication protocol defined by the `javax.security.auth.spi.LoginModule` interface.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
login()
Why it's wrong here
login() validates credentials; commit() follows.
- ✗
initialize()
Why it's wrong here
initialize() is for initializing the LoginModule, not for committing.
- ✓
commit()
Why this is correct
commit() commits the authentication and associates principals with the Subject.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
abort()
Why it's wrong here
abort() is used to clean up if authentication fails.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the purpose of `login()` and `commit()`, mistakenly thinking that `login()` both authenticates and adds principals, when in fact `login()` only performs verification and `commit()` is required to populate the Subject.
Detailed technical explanation
How to think about this question
The JAAS `LoginModule` interface defines a two-phase commit protocol: `login()` performs authentication and may cache results, while `commit()` finalizes the process by adding principals and credentials to the Subject only if the overall authentication succeeds. Under the hood, the `LoginContext` orchestrates this by calling `login()` on all configured modules, and only if all succeed does it call `commit()` on each; otherwise, `abort()` is called. This design allows multiple modules to cooperate in a stack, ensuring atomicity of the authentication result.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
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FAQ
Questions learners often ask
What does this 1Z0-829 question test?
Java I/O API and Securing Applications — This question tests Java I/O API and Securing Applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: commit() — In a JAAS login module, after the `login()` method returns `true`, the `commit()` method must be called to associate the authenticated principals and credentials with the `Subject`. The `commit()` method is responsible for adding the successfully authenticated principals to the Subject, making them available for subsequent authorization checks. This is part of the two-phase authentication protocol defined by the `javax.security.auth.spi.LoginModule` interface.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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