Deep runtime internals, memory models, distributed design, concurrency failure modes, and architectural decisions.
ObjectMonitor). Threads are parked and queued in native OS wait states, incurring heavy kernel context-switching penalties.-XX:MaxGCPauseMillis).LoadLoad: Prevents subsequent reads from reordering before previous reads.StoreStore: Prevents subsequent writes from reordering before previous writes.LoadStore: Prevents subsequent writes from reordering before previous reads.StoreLoad: The strongest fence; forces all previous writes to main memory before subsequent reads are evaluated.static {}) and assigns real values to static fields.Class.forName("MyClass"): Loads, links, and initializes the class, running static blocks immediately.ClassLoader.loadClass("MyClass"): Only loads the class; linking and initialization are delayed until the class is instantiated or referenced.jmap -dump:live,format=b,file=heap.hprof [pid]. Analyze references using Eclipse Memory Analyzer (MAT) to identify leak suspects retaining massive heaps (retained size).jstack [pid] or jcmd [pid] Thread.print. Examine thread states to locate deadlocks or threads blocked indefinitely on monitor lock acquisitions.async-profiler or JProfiler to capture on-cpu stack traces, identifying performance-intensive methods and loop bottlenecks.You've completed the 5 free sample questions. Get unrestricted lifetime access to every question, model answer, implementation challenge, and all 27+ technologies for a single payment.
One-time settlement () · Lifetime access · Zero subscription