Quick Answer
The answer is to set -XX:MaxMetaspaceSize to a higher value. This is correct because Metaspace stores class metadata, and frameworks like Hibernate and JasperReports generate many dynamic classes at runtime, which can exhaust the default unlimited metaspace constrained by native memory. Increasing -Xmx only expands the Java heap, not the metaspace region, so it does not address the root cause. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of JVM memory regions and the distinction between heap and non-heap memory. A common trap is confusing -Xmx (heap) with metaspace settings; remember that metaspace is separate from the heap and is controlled by -XX:MaxMetaspaceSize. For a memory tip, think: "Metaspace holds class space, not object space" — so when you see OutOfMemoryError: Metaspace, adjust the metaspace limit, not the heap.
This 1Z0-811 practice question tests your understanding of what is java. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 large enterprise application is experiencing intermittent crashes on a production server running Java 8. The crash logs show 'java.lang.OutOfMemoryError: Metaspace'. The application heavily uses frameworks like Hibernate and JasperReports, which generate many classes dynamically at runtime. The server is configured with default JVM options except for -Xmx2g. A junior administrator suggests increasing -Xmx to 4g. What is the most effective solution to prevent these crashes?
Enable -XX:+UseCompressedOops
Why wrong: This optimizes heap references, not metaspace capacity.
Increase -Xmx to 4g
Why wrong: This increases heap, but the error is in metaspace, not heap.
Switch to -XX:+UseParallelGC
Why wrong: GC algorithm change does not increase metaspace size.
Set -XX:MaxMetaspaceSize to a higher value
Directly increases the limit for class metadata storage.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Set -XX:MaxMetaspaceSize to a higher value
Option B is correct. Metaspace is used for class metadata; dynamic class generation fills metaspace. The default MaxMetaspaceSize is unlimited but can be constrained by available native memory. Increasing MaxMetaspaceSize (or leaving it unlimited) is the direct fix. Option A is incorrect because -Xmx increases heap, not metaspace. Option C is incorrect because UseCompressedOops optimizes heap memory, not metaspace. Option D is incorrect because switching GC may not address the metaspace exhaustion.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Enable -XX:+UseCompressedOops
Why it's wrong here
This optimizes heap references, not metaspace capacity.
Increase -Xmx to 4g
Why it's wrong here
This increases heap, but the error is in metaspace, not heap.
Switch to -XX:+UseParallelGC
Why it's wrong here
GC algorithm change does not increase metaspace size.
Set -XX:MaxMetaspaceSize to a higher value
Why this is correct
Directly increases the limit for class metadata storage.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 1Z0-811 NAT questions on configuration and troubleshooting.
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FAQ
What is Java — This question tests What is Java — Static NAT maps one inside address to one outside address..
The correct answer is: Set -XX:MaxMetaspaceSize to a higher value — Option B is correct. Metaspace is used for class metadata; dynamic class generation fills metaspace. The default MaxMetaspaceSize is unlimited but can be constrained by available native memory. Increasing MaxMetaspaceSize (or leaving it unlimited) is the direct fix. Option A is incorrect because -Xmx increases heap, not metaspace. Option C is incorrect because UseCompressedOops optimizes heap memory, not metaspace. Option D is incorrect because switching GC may not address the metaspace exhaustion.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 1Z0-811 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 23, 2026
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