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 Java application uses a custom resource class implementing AutoCloseable. The close() method throws a checked exception. In a try-with-resources block, if both the try block and the close() method throw exceptions, which exception is propagated to the caller? Assume the resource is declared in try-with-resources.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The exception from the try block is the primary exception, and the close() exception is added as a suppressed exception.
In a try-with-resources block, when both the try block and the close() method throw exceptions, the exception from the try block is the primary exception propagated to the caller. The exception thrown by close() is added to the primary exception's suppressed exception list, as defined by the Java Language Specification (JLS §14.20.3.2). This ensures that the most relevant exception (the one from the application logic) is not masked by a resource-closing failure.
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.
✓
The exception from the try block is the primary exception, and the close() exception is added as a suppressed exception.
Why this is correct
Correct behavior per Java try-with-resources.
Related concept
Read the scenario before looking for a memorised answer.
✗
The exception from close() is always the primary exception.
Why it's wrong here
The try block exception takes precedence.
✗
Both exceptions are thrown simultaneously as a multi-catch exception.
Why it's wrong here
Java does not throw multiple exceptions; one is primary, others suppressed.
✗
The exception from the try block is always suppressed.
Why it's wrong here
The try block exception is primary, not suppressed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the last exception thrown (from close()) overwrites the first, or that both exceptions are thrown together, when in fact the try block exception is primary and the close() exception is suppressed.
Detailed technical explanation
How to think about this question
Under the hood, the try-with-resources statement uses a generated try-finally structure where the close() method is called in the finally block. If both the try block and close() throw, the JVM captures the close() exception via Throwable.addSuppressed() and attaches it to the primary exception. This mechanism is crucial in real-world scenarios like database connections, where a SQLException from the try block (e.g., query failure) must not be lost due to a subsequent connection close failure.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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: The exception from the try block is the primary exception, and the close() exception is added as a suppressed exception. — In a try-with-resources block, when both the try block and the close() method throw exceptions, the exception from the try block is the primary exception propagated to the caller. The exception thrown by close() is added to the primary exception's suppressed exception list, as defined by the Java Language Specification (JLS §14.20.3.2). This ensures that the most relevant exception (the one from the application logic) is not masked by a resource-closing failure.
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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