1Z0-811 Exception Handling and Development Tools Practice Question
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. 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.
Exhibit
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)
```
A
Line 30
Why wrong: Not mentioned in the stack trace.
B
Line 10
Why wrong: Line 10 is in Main.java, not the source of the exception.
C
Line 15
Why wrong: Not mentioned in the stack trace.
D
Line 25
The stack trace indicates the exception at line 25 of MyClass.java.
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 indicates that an exception occurred in MyClass.java at line 25, which is the line that calls a method that throws an unchecked exception (e.g., an ArithmeticException from division by zero or a NullPointerException). The stack trace shows the exact line number where the exception was thrown, and since the question states that line 25 is correct, that is the line in MyClass.java that caused the exception.
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.
✗
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
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the ability to read a stack trace and correctly identify the line number where the exception occurred, and the trap here is that candidates may confuse the line number in the stack trace with a line number from a different method or class, or they may misread the stack trace order and pick a line from a caller method instead of the actual throwing line.
Detailed technical explanation
How to think about this question
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.
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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Exception Handling and Development Tools — This question tests Exception Handling and Development Tools — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Line 25 — The stack trace indicates that an exception occurred in MyClass.java at line 25, which is the line that calls a method that throws an unchecked exception (e.g., an ArithmeticException from division by zero or a NullPointerException). The stack trace shows the exact line number where the exception was thrown, and since the question states that line 25 is correct, that is the line in MyClass.java that caused the exception.
What should I do if I get this 1Z0-811 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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Question Discussion
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