33 questions for “JVM”

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Information Technology

33 questions in 2 technologies

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1What is the role of the ClassLoader in the JVM, and what are the three built-in bootstrap/platform/application class loaders? Java › Class Loading & Bytecode VerificationJavaClass Loading & Bytecode VerificationBeginner
2What is garbage collection in the JVM, and what fundamental problem does it solve compared to manual memory management (like in C/C++)? Java › Garbage CollectionJavaGarbage CollectionBeginner
3How does the generational hypothesis (most objects die young) inform the JVM's generational heap structure (young generation, old generation), and how does a minor GC differ from a major/full GC? Java › Garbage CollectionJavaGarbage CollectionIntermediate
4What is bytecode verification, and what specific categories of invalid or unsafe bytecode does the JVM's verifier reject before allowing a class to run? Java › Class Loading & Bytecode VerificationJavaClass Loading & Bytecode VerificationAdvanced
5How does the same class name loaded by two different ClassLoaders create two genuinely distinct types in the JVM, and what problems does this cause (such as with singletons or ClassCastException)? Java › Class Loading & Bytecode VerificationJavaClass Loading & Bytecode VerificationAdvanced
6How does Class Data Sharing (CDS) and Application Class Data Sharing (AppCDS) improve JVM startup time, and how does it relate to class loading and verification? Java › Class Loading & Bytecode VerificationJavaClass Loading & Bytecode VerificationAdvanced
7What is the purpose of the -Xverify:none (or newer -noverify) JVM flag, and why is disabling bytecode verification generally discouraged? Java › Class Loading & Bytecode VerificationJavaClass Loading & Bytecode VerificationIntermediate
8What is hot class reloading/redefinition (via Instrumentation.redefineClasses() or a JVM agent), and what are its practical limitations compared to a full class unload/reload? Java › Class Loading & Bytecode VerificationJavaClass Loading & Bytecode VerificationIntermediate
9What is the purpose of the addSuppressed() mechanism and getSuppressed() method on Throwable, and in what specific scenario does the JVM automatically populate suppressed exceptions? Java › ExceptionsJavaExceptionsIntermediate
10How would you use JVM flags to tune heap size (-Xms, -Xmx) and understand the trade-offs of setting them equal versus allowing dynamic heap resizing? Java › Garbage CollectionJavaGarbage CollectionIntermediate
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