1Z0-811 Exception Handling and Development Tools Practice Question
Which TWO command-line tools are included in the Oracle JDK for monitoring and troubleshooting Java applications? (Select exactly 2)
⚠ Common exam trap
Oracle often tests the distinction between development tools (javap, jdb) and runtime monitoring tools (jstack, jstat), leading candidates to mistakenly select javap or jdb because they are familiar from debugging sessions.
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
✓
jstack
jstack is a command-line tool included in the Oracle JDK that prints Java stack traces of threads for a given Java process or core dump. It is used to diagnose deadlocks, thread contention, and other concurrency issues by showing the state and call stack of each thread.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
jstack
Why this is correct
jstack prints Java thread dumps for troubleshooting deadlocks and thread issues.
- ✗
jmod
Why it's wrong here
jmod manipulates Java module files, not for monitoring.
- ✓
jstat
Why this is correct
jstat monitors JVM statistics such as garbage collection and memory usage.
- ✗
javap
Why it's wrong here
javap disassembles class files, not for monitoring.
- ✗
jdb
Why it's wrong here
jdb is a debugger used for interactive debugging, not primarily for monitoring.
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