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.
Consider the following code:
public void process() throws Exception {try { riskyMethod();
} catch (IOException | SQLException e) {throw e;
} }
Assuming riskyMethod() declares both IOException and SQLException, what is the result?
Compilation fails because you cannot rethrow a multi-catch variable.
Why wrong: Rethrow is allowed with multi-catch.
Compilation fails because the catch variable must be cast to Exception.
Why wrong: No cast needed.
The code compiles, but throws a ClassCastException at runtime.
Why wrong: No runtime error.
The code compiles and runs correctly.
Works fine in Java 17.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The code compiles and runs correctly.
In Java 7+, multi-catch variables are implicitly final, so they can be rethrown without a cast. The compiler knows that the thrown exception is exactly one of the caught types (IOException or SQLException), and since both are checked exceptions declared in the method signature, the code compiles and runs correctly. Option D is correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Compilation fails because you cannot rethrow a multi-catch variable.
Why it's wrong here
Rethrow is allowed with multi-catch.
Compilation fails because the catch variable must be cast to Exception.
Why it's wrong here
No cast needed.
The code compiles, but throws a ClassCastException at runtime.
Why it's wrong here
No runtime error.
The code compiles and runs correctly.
Why this is correct
Works fine in Java 17.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates mistakenly believe multi-catch variables cannot be rethrown without a cast, confusing them with pre-Java 7 single-catch blocks where the variable was not effectively final.
Detailed technical explanation
Under the hood, the compiler treats the multi-catch variable as a union type (e.g., IOException|SQLException) and ensures that the rethrow is valid only if the method's throws clause includes all possible exception types. This is a compile-time safety check; at runtime, the thrown exception is exactly the original type, so no casting or type erasure occurs. In real-world code, this pattern is useful for logging or cleanup before rethrowing without losing the specific exception type.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Handling Exceptions — This question tests Handling Exceptions — Read the scenario before looking for a memorised answer..
The correct answer is: The code compiles and runs correctly. — In Java 7+, multi-catch variables are implicitly final, so they can be rethrown without a cast. The compiler knows that the thrown exception is exactly one of the caught types (IOException or SQLException), and since both are checked exceptions declared in the method signature, the code compiles and runs correctly. Option D is correct.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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