The correct approach is to use a try-with-resources statement with a catch clause that wraps the IOException in a custom ApplicationException. This is correct because try-with-resources automatically calls close() on any resource implementing AutoCloseable—such as BufferedReader—when the block exits, whether normally or due to an exception. The catch clause then handles any IOException by throwing a new ApplicationException that wraps the original cause, satisfying both the resource-closing and custom exception wrapping requirements without any manual cleanup. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of combining try-with-resources with exception wrapping, a common pattern for robust resource management. A frequent trap is attempting to close the resource manually in a finally block, which defeats the purpose of try-with-resources and can mask exceptions. Memory tip: “Wrap and close in one go—try-with-resources plus catch wraps the throw.”
1Z0-829 Handling Exceptions Practice Question
This 1Z0-829 practice question tests your understanding of handling exceptions. 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.
A developer is writing a method that reads a file and processes its content. The method must ensure that if an IOException occurs during reading, the method throws a custom ApplicationException that wraps the original IOException, and that any resources opened are closed properly. Which approach correctly implements this requirement?
Option C is correct because it uses a try-with-resources statement, which automatically closes the BufferedReader (which implements AutoCloseable) when the block exits, whether normally or exceptionally. The catch clause then catches any IOException and wraps it in a custom ApplicationException, satisfying both the resource-closing and exception-wrapping requirements without manual cleanup.
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.
Resource may not be closed if an exception occurs before close().
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a finally block is required for resource cleanup, but the try-with-resources statement handles it automatically, and they may overlook that placing close() in the try block (as in D) does not guarantee execution if an exception occurs before that line.
Detailed technical explanation
How to think about this question
The try-with-resources statement (introduced in Java 7) ensures that each resource declared in the try header is closed automatically by calling its close() method in the reverse order of declaration, even if an exception occurs. This is implemented via a generated finally block that suppresses exceptions thrown during close() if a primary exception is already being propagated, preserving the original IOException for the catch clause to wrap. In real-world file processing, this pattern prevents resource leaks and ensures that the root cause of a failure (e.g., a corrupt file) is not masked by a secondary failure during cleanup.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Handling Exceptions — This question tests Handling Exceptions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: try (BufferedReader reader = Files.newBufferedReader(path)) { ... } catch (IOException e) { throw new ApplicationException(e); } — Option C is correct because it uses a try-with-resources statement, which automatically closes the BufferedReader (which implements AutoCloseable) when the block exits, whether normally or exceptionally. The catch clause then catches any IOException and wraps it in a custom ApplicationException, satisfying both the resource-closing and exception-wrapping requirements without manual cleanup.
What should I do if I get this 1Z0-829 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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