1Z0-829 Java I/O API and Securing Applications Practice Question
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?
⚠ Common exam trap
A common mix-up: candidates 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.
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.
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.
- ✗
abort()
Why it's wrong here
abort() is used to clean up if authentication fails.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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