Development

Programming, frameworks, implementation, frontend, backend, and app development

skills in category: 66,450
pages available: 2,769

Security grades appear on each card once the skill has been scanned. Newly imported skills may briefly show without a grade until the backfill job runs.

Open in full browser

Browse development skills

Showing 14,305–14,328 of 66,450 skills

Latency StatisticsAThe statistics of latency measurement: estimands, means and quantiles, histogram aggregation, uncertainty, censoring, dependence, and coordinated omission. Use when an SLO or dashboard reports mean latency, when p99 values are averaged across instances or time windows, when a percentile is quoted without its sample count, when Prometheus buckets are the default set, or when deciding whether two measurements actually differ. Does not cover generating the load (load-testing), sizing systems fro...developmentjavarailsVotes: 0GitHub stars: 2
Kubernetes Service LifecycleAA Java service at the edges of its life under Kubernetes: liveness, readiness and startup probes as three different questions, probe timing arithmetic, graceful shutdown as a sequence where endpoint removal races SIGTERM, terminationGracePeriodSeconds as a budget, draining non-HTTP work such as Kafka consumers and scheduled jobs, PodDisruptionBudgets, and limits as availability decisions. Use when 502s appear only during a rolling update, when a liveness probe checks a database and a blip res...developmentgojavaVotes: 0GitHub stars: 2
Kafka Consumers In JavaAOperating a Kafka consumer from Java: the log-not-a-queue model where consumption removes nothing and position is an offset; the rebalance as the central operational event, with assignment and membership choices that can reduce disruption and where duplicates enter; processing-interval versus heartbeat/session failures; pause/resume for slow work; commit strategies; auto.offset.reset as a data-loss-or-reprocessing decision; and lag as record, byte, time and catch-up signals. Use when a group ...developmentjavaspringVotes: 0GitHub stars: 2
Jvm Performance ReviewAAuditing JVM configuration evidence across the supplied command, effective runtime flags, target JDK build, container/cgroup envelope, workload lifecycle, and stated SLO. Classifies flags by support and origin, detects masking, duplicates and ergonomic interactions, prices heap/non-heap/CPU/startup trade-offs, and emits prioritized falsifiable findings rather than folklore flag lists. Use for JVM options, Kubernetes manifests, JDK upgrades, collector/heap proposals, or claims that a flag fixe...developmentrustgoVotes: 0GitHub stars: 2
Jvm Ml InferenceAEngineering CPU and accelerator-backed ML inference from JVM applications: choosing in-process versus remote serving, bounding native sessions and predictors, coordinating engine and request parallelism, batching under a latency deadline, reusing direct buffers, warming deployments and diagnosing native memory outside NMT. Use when DJL, ONNX Runtime or another native inference engine loses throughput as concurrency rises, leaks RSS, overloads a model pool or needs graceful degradation. Traini...developmentgojavaVotes: 0GitHub stars: 2
Jvm Memory RegionsAThe major memory-accounting domains of a JVM process — heap, Metaspace/class space, code cache, thread stacks, direct/native/JVM-internal memory and mapped/file-backed pages — and how to budget them against a container limit. Use when a pod is OOMKilled with no Java exception, when an OutOfMemoryError names something other than "Java heap space", when -Xmx is set equal to the container limit, when RSS exceeds the heap by more than expected, when a heap above 32 GB is proposed, or when sizing ...developmentgojavaVotes: 0GitHub stars: 2
Skills DirectorySkills Directory 3 slots · $399/mo · one ad per page · sponsors can never buy grades.See placements
Jvm Gc TuningADeciding whether GC is the actual bottleneck, then choosing a collector and sizing the heap. Use when GC pauses appear on the critical path of a latency profile, when full collections show up, when the heap grows toward its limit, when sizing a JVM for a container, or when a collector change is being proposed. Start from java-performance instead when the symptom is latency or CPU and GC has not been confirmed as the cause. Does not cover how collectors work internally (gc-fundamentals), confi...developmentgojavaVotes: 0GitHub stars: 2
Jvm Class LoadingAClass loading, class identity and classloader leaks: parent-first delegation, {defining loader, binary name} identity, loading versus linking versus initialisation, Metaspace retention, and CDS/AOT cache for startup. Use when a ClassCastException reports identical type names on both sides, when Metaspace grows monotonically across redeploys or plugin reloads, when ClassNotFoundException and NoClassDefFoundError need to be told apart, when IllegalAccessError mentions "does not export" or Inacc...developmentrustjavaVotes: 0GitHub stars: 2
Jvm BytecodeAReading and reasoning about JVM bytecode: javap -c -p -v, operand stack and local slots, the constant pool and resolution timing, descriptors versus Signature, the invoke* family with invokedynamic and inline caching, verification and the StackMapTable, the class-file limits, what javac desugars, and what bytecode does and does not say about performance. Use when a VerifyError appears after instrumentation by an agent, proxy or mock library, when UnsupportedClassVersionError names two class f...developmentrustgoVotes: 0GitHub stars: 2
Jni And FfmACrossing into native code: JNI call overhead, critical sections and what they block, the FFM downcall and upcall path, `Linker` and method handles, why a native frame pins a virtual thread, and measuring the boundary cost. Use when a native call sits inside a tight loop, when someone proposes migrating JNI to Panama to fix pinning, when `Linker.Option.critical()` is applied without a measured duration, when `jdk.VirtualThreadPinned` events point at a `native` method or `MethodHandle.invokeExa...developmentgojavaVotes: 0GitHub stars: 2
Jmh MicrobenchmarksADesigning and auditing JVM microbenchmarks whose workload, observation boundary, compiler context, state topology, lifecycle, units, and statistical comparison match the engineering question. Covers dead-code elimination, constant folding, Blackhole/return values, forks, warm-up, fixture levels, inputs, operations-per-invocation, allocation counters, experimental units, uncertainty, paired comparisons, negative controls, and production extrapolation. Use before trusting a JMH score or replaci...developmentrustgoVotes: 0GitHub stars: 2
Jmh AdvancedADesigning advanced JMH experiments: shared and asymmetric state topologies, groups, parameter matrices, auxiliary counters, fixture arbitration, fork/JVM controls, profilers, hardware counters, annotated assembly, compiler controls, cold-state protocols, and multi-modal variance diagnosis. Uses runtime capability discovery and separates diagnostic profiled runs from decision runs. Use when a benchmark is concurrent, fork-dependent, profiler-sensitive, cold/startup-oriented, or produces unexpl...developmentrustgoVotes: 0GitHub stars: 2
Jit Inlining And Escape AnalysisAInlining and escape analysis in C2: inlining as the multiplier, scalar replacement versus "stack allocation", flow-insensitivity, turning a PrintInlining verdict into a code change, and measuring with gc.alloc.rate.norm. Use when allocation rate is high on a hot path, when a hot call is refused inlining and the fix is unclear, when an object pool for small objects, @ForceInline on application code or a higher FreqInlineSize is proposed, when an interface gains a third implementation on a crit...developmentgojavaVotes: 0GitHub stars: 2
Jit CompilationAHotSpot JIT compilation and warm-up: tiered policy, C1/C2 queues and profiling, OSR, deoptimization, code-cache pressure, compiler resources in containers, and warm-up as a workload-dependent curve rather than a clock delay. Use when p99 is bad for the first minutes after a deploy, when performance degrades permanently until a restart, when "CodeCache is full" appears, when a startup probe or traffic gate needs a warm-up criterion, when -XX:-TieredCompilation or -Xcomp is proposed, when scali...developmentgojavaVotes: 0GitHub stars: 2
Jhsdb And Core DumpsAPost-mortem inspection of a dead or hung JVM: reading hs_err, producing a usable core dump, the jhsdb modes (jstack, jmap, jinfo, clhsdb, hsdb) against a core or a live process, and the build and symbol requirements that make a dump readable. Use when a process died and left an hs_err_pid file, when jstack or jcmd hangs against a wedged JVM, when a container disappeared with exit code 137 and no log, when a crash points at a J/V/C frame, when jhsdb reports DebuggerException or nonsensical poi...developmentgojavaVotes: 0GitHub stars: 2
Jfr And Async ProfilerASelecting the least-perturbing JVM evidence source that matches the question: JFR events and timeline versus async-profiler sampling, CPU versus elapsed/off-CPU, allocation versus retention, lock versus queue/I/O, startup versus steady state, and one-off versus continuous capture. Covers adequacy, positive controls, target scope, version discovery, container access, overhead, artifact integrity, and cross-tool reconciliation. Use before a JVM profile is collected or when an empty/disagreeing ...developmentgojavaVotes: 0GitHub stars: 2
Jfr AdvancedAEngineering JDK Flight Recorder evidence beyond stock settings: discovering event schemas and settings on the target build, designing threshold/period/throttle/stack trade-offs, composing and validating JFC configurations, accounting for concurrent recordings, defining low-cost custom events and relational metadata, operating Recording/RecordingStream/MXBean consumers, and validating loss, parsing, retention, privacy, and Java 25 JFR features. Use when an event is absent, a field/parser is gu...developmentjavabashVotes: 0GitHub stars: 2
Jdk Upgrade ImpactAMoving a service between JDKs: what breaks, in what order to find it, and what should get faster — running unchanged on the new runtime with warnings visible, classifying each failure as a retired flag, strong encapsulation, a removed API, a changed default or a third-party agent, and measuring the gain claimed for the upgrade. Use when an LTS-to-LTS move is planned, when a build passes and the service will not start on the new JDK, when --add-opens is being added to make something work, when...developmentgojavaVotes: 0GitHub stars: 2
Java Thread Safety ContractsASpecifying and reviewing thread-safety as a caller-visible behavioral contract: ownership and confinement, immutability, atomic operations and compound invariants, consistency/iteration, lock identity and scope, callbacks/alien calls, deadlock ordering, progress/fairness, publication, lazy initialization, cancellation, and lifecycle. Use when a shared class has an ambiguous guarantee or a proposed lock/atomic/concurrent collection may preserve individual methods but violate multi-call semanti...developmentgojavaVotes: 0GitHub stars: 2
Java Testing StrategyAChoosing which test level earns its cost for a given change: what a unit, integration, contract or end-to-end test can and cannot prove, pushing each test to the narrowest scope where the risk is actually real, what every mocked boundary obliges you to verify elsewhere, and coverage as a diagnostic rather than a target. Use when deciding where to test a change, when a suite is slow or nobody trusts it, when a bug escaped a green suite, when mocks make a test pass while production fails, when ...developmentrustjavaVotes: 0GitHub stars: 2
Java Test DoublesAChoosing and using test doubles in Java: the stub/mock/fake distinction that actually changes what a test proves, selecting real collaborators, fakes or mocks for the needed evidence, verifying contractual interactions, Mockito's strict stubs, and deciding when a foreign API needs an owned boundary. Use when a test mocks every collaborator the class touches, when verify is asserted on a query, when a refactoring broke tests that still describe correct behaviour, when deep stubs or static mock...developmentjavaspringVotes: 0GitHub stars: 2
Java Test DesignAWriting a Java test that survives refactoring and says why it failed: naming the behaviour rather than the method, one reason to fail, test data builders over shared mutable setup, choosing the assertion that produces a readable failure, parameterised and nested tests, and controlling relevant inputs — clock, ordering, locale, randomness. Use when a test name does not say what broke, when a failure message has to be decoded by reading the test, when setup is shared across unrelated tests, whe...developmentgojavaVotes: 0GitHub stars: 2
Java Tell Dont AskADecision ownership: the type that owns an invariant or policy makes the decision. Use when a service reads state with getters, decides, and writes state back (if (acct.getBalance() > x) acct.setBalance(...)), when the same rule is re-derived from the same getters in several places, when an invariant exists but no type enforces it, when a domain model is all getters and setters with the logic in services, or when a getter has side effects. Covers command–query separation and when asking is cor...developmentrustgoVotes: 0GitHub stars: 2
Java Strings And TextAText in Java as encoded data rather than a universal type: UTF-16 code units versus code points versus graphemes, charsets and why the platform default is not a policy, locale-sensitive case and formatting including the Turkish-I bug, concatenation cost in loops versus single expressions, text blocks, regex compilation and catastrophic backtracking on untrusted input, interning, and injection through SQL, shells, paths and logs. Use when a String stands in for a type or compound key, when tex...developmentrustgoVotes: 0GitHub stars: 2