This 1Z0-811 practice question tests your understanding of exception handling and development tools. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: stack Trace. 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.
Refer to the exhibit.
```
Exception in thread "main" java.lang.NullPointerException
at com.example.MyClass.process(MyClass.java:25)
at com.example.Main.main(Main.java:10)
```Given the stack trace above, which line in MyClass.java caused the exception?
Refer to the exhibit.
```
Exception in thread "main" java.lang.NullPointerException
at com.example.MyClass.process(MyClass.java:25)
at com.example.Main.main(Main.java:10)
```Line 30
Why wrong: Not mentioned in the stack trace.
Line 10
Why wrong: Line 10 is in Main.java, not the source of the exception.
Line 15
Why wrong: Not mentioned in the stack trace.
Line 25
The stack trace indicates the exception at line 25 of MyClass.java.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Line 25
The stack trace displayed in the question shows the exception was thrown at line 25 of MyClass.java. The topmost line in a stack trace indicates the exact line where the exception originated. Lines 10, 15, and 30 correspond to caller methods that appear lower in the stack trace, making line 25 the correct answer.
Key principle: Stack Trace
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Line 30
Why it's wrong here
Not mentioned in the stack trace.
Line 10
Why it's wrong here
Line 10 is in Main.java, not the source of the exception.
Line 15
Why it's wrong here
Not mentioned in the stack trace.
Line 25
Why this is correct
The stack trace indicates the exception at line 25 of MyClass.java.
Related concept
Stack Trace
Common exam traps
Candidates often misread the stack trace by focusing on the exception message or the first line of the trace, which lists the exception type, rather than the actual line number in the class file. The trap is to pick a line from a caller method instead of the line where the exception was thrown, which is the topmost reference to MyClass.java.
Detailed technical explanation
When an exception occurs in Java, the JVM creates a stack trace that lists the method call chain and the exact line numbers where each method was invoked, with the topmost frame being the point where the exception was thrown. This allows developers to pinpoint the exact line in the source code that caused the exception, which is critical for debugging. In real-world scenarios, understanding how to read stack traces is essential for quickly identifying and fixing runtime errors in production code.
Key takeaway
Stack Trace
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Stack Trace Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Review stack Trace, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
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FAQ
Exception Handling and Development Tools — This question tests Exception Handling and Development Tools — Stack Trace.
The correct answer is: Line 25 — The stack trace displayed in the question shows the exception was thrown at line 25 of MyClass.java. The topmost line in a stack trace indicates the exact line where the exception originated. Lines 10, 15, and 30 correspond to caller methods that appear lower in the stack trace, making line 25 the correct answer.
Review stack Trace, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
Stack Trace
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Last reviewed: Jun 30, 2026
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