1Z0-811 Stack Trace Practice Question
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?
Exception in thread "main" java.lang.NullPointerException at MyClass.methodC(MyClass.java:25) at MyClass.methodB(MyClass.java:15) at MyClass.methodA(MyClass.java:10) at MyClass.main(MyClass.java:30)
⚠ Common exam trap
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.
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
✓
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.
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.
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