Question 60 of 481
1Z0-811 What is Java Practice Question
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?
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
✓
Set -XX:MaxMetaspaceSize to a higher value
The crash is caused by Metaspace exhaustion due to dynamic class generation by frameworks like Hibernate and JasperReports. The default MaxMetaspaceSize is unlimited, but the JVM may still hit native memory limits. Setting -XX:MaxMetaspaceSize to a higher value (or leaving it unlimited but with more available memory) directly addresses the issue. Option B (Increasing -Xmx) only increases heap size, which does not affect Metaspace. Option A (UseCompressedOops) optimizes object references in the heap, not class metadata. Option C (UseParallelGC) changes the garbage collector but does not prevent Metaspace growth. Therefore, Option D is the most effective solution.
Answer analysis
Option-by-option breakdown
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.
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Last reviewed: Jun 23, 2026
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