# vipshop/vjtools

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7,636 stars · 1,510 forks · Java · Apache-2.0

## Links

- GitHub: https://github.com/vipshop/vjtools
- awesome-repositories: https://awesome-repositories.com/repository/vipshop-vjtools.md

## Topics

`java` `java-library`

## Description

vjtools is a comprehensive Java development toolset and runtime monitor designed for optimizing application performance and ensuring codebase consistency. It provides a suite of JVM diagnostics tools, a performance profiler, and a static analysis system for enforcing coding standards.

The project distinguishes itself through specialized runtime observability, including the ability to attach to processes via process ID and inject dynamic probes to monitor method calls without restarting the system. It features container-aware resource detection that reads control group files to report actual CPU limits rather than host totals.

The toolkit covers a broad range of diagnostic capabilities, including deep memory analysis for heap generation and object age filtering, thread performance analysis to identify CPU hotspots, and garbage collection log parsing. It also includes utilities for JMX bean inspection, runtime metric tracking with threshold alerting, and thread-pool isolation to prevent resource exhaustion.

Additional utilities provide general-purpose libraries for text processing and concurrency, log data masking for privacy, and tools for JVM parameter optimization.

## Tags

### Development Tools & Productivity

- [Java Development Toolsets](https://awesome-repositories.com/f/development-tools-productivity/java-development-toolsets.md) — Provides a comprehensive suite of core utilities, coding standards, and shared libraries for optimizing Java development.
- [Static Analysis Rules](https://awesome-repositories.com/f/development-tools-productivity/code-quality-analysis/static-analysis-engines/static-analysis-tools/static-analysis-rules.md) — Enforces coding standards and architectural consistency using customized pattern matching and formatting templates.
- [JVM Diagnostic](https://awesome-repositories.com/f/development-tools-productivity/modular-architecture/toolsets/jvm-diagnostic.md) — Provides a comprehensive toolset for analyzing heap dumps, thread dumps, and garbage collection logs to identify bottlenecks.
- [Thread Dumps](https://awesome-repositories.com/f/development-tools-productivity/thread-managers/thread-dumps.md) — Provides diagnostic snapshots of active virtual machine threads to detect deadlocks and resource contention. ([source](https://github.com/vipshop/vjtools/blob/master/docs/other/othertools.md))

### Part of an Awesome List

- [JVM Profiling Tools](https://awesome-repositories.com/f/awesome-lists/devtools/jvm-profiling-tools.md) — Traces execution flow and generates flame graphs to identify CPU hotspots in running Java applications.
- [Resource Limit Detection](https://awesome-repositories.com/f/awesome-lists/devops/virtualization-and-containers/container-detection/resource-limit-detection.md) — Reports actual container CPU limits instead of host totals to ensure correct thread allocation. ([source](https://github.com/vipshop/vjtools/blob/master/vjstar))

### Programming Languages & Runtimes

- [JVM Performance Tuning](https://awesome-repositories.com/f/programming-languages-runtimes/jvm-performance-tuning.md) — Provides recommended configuration flags for different JDK versions to balance performance and troubleshooting speed. ([source](https://github.com/vipshop/vjtools/tree/master/vjstar))
- [Object Age Filtering](https://awesome-repositories.com/f/programming-languages-runtimes/object-age-filtering.md) — Identifies long-lived objects exceeding specific age thresholds to detect promotion issues in the heap. ([source](https://github.com/vipshop/vjtools/blob/master/vjmap))
- [Loaded Class Auditing](https://awesome-repositories.com/f/programming-languages-runtimes/dynamic-class-creation/class-loading-mechanisms/loaded-class-auditing.md) — Provides the ability to audit all classes currently loaded in the runtime for a specific process. ([source](https://github.com/vipshop/vjtools/blob/master/vjmap/README.md))
- [Performance-Based Isolation](https://awesome-repositories.com/f/programming-languages-runtimes/language-features-paradigms/concurrency-models/concurrency/task-orchestration-frameworks/thread-pools/custom-thread-pool-configurations/command-based-pool-isolation/performance-based-isolation.md) — Moves slow-performing methods from shared pools to isolated pools to prevent total system saturation. ([source](https://github.com/vipshop/vjtools/blob/master/vjstar))
- [Slow-Method Isolation](https://awesome-repositories.com/f/programming-languages-runtimes/language-features-paradigms/concurrency-models/concurrency/task-orchestration-frameworks/thread-pools/custom-thread-pool-configurations/slow-method-isolation.md) — Redirects slow-performing methods to a dedicated isolated pool to prevent resource exhaustion of the main system.
- [Manual Garbage Collection Triggers](https://awesome-repositories.com/f/programming-languages-runtimes/manual-garbage-collection-triggers.md) — Executes manual garbage collection cycles during low-traffic windows to prevent performance spikes during peak hours. ([source](https://github.com/vipshop/vjtools/blob/master/vjstar))
- [Runtime Diagnosis Tools](https://awesome-repositories.com/f/programming-languages-runtimes/runtime-diagnosis-tools.md) — Analyzes runtime behavior and metrics to identify bottlenecks and optimize overall system performance. ([source](https://github.com/vipshop/vjtools/blob/master/.gitignore))

### Software Engineering & Architecture

- [Coding Standards Enforcement](https://awesome-repositories.com/f/software-engineering-architecture/coding-standards-enforcement.md) — Maintains project guidelines and quality constraints by applying consistent development rules and formatting templates. ([source](https://github.com/vipshop/vjtools#readme))
- [Java Static Analysis Tools](https://awesome-repositories.com/f/software-engineering-architecture/java-static-analysis-tools.md) — Enforces coding standards and formatting rules across Java codebases using custom analysis rules.
- [Dynamic Probes](https://awesome-repositories.com/f/software-engineering-architecture/method-logic-injection/dynamic-probes.md) — Enables the injection of dynamic probes into running processes to monitor method calls without requiring system restarts.

### System Administration & Monitoring

- [Dynamic System Tracing](https://awesome-repositories.com/f/system-administration-monitoring/dynamic-system-tracing.md) — Injects dynamic probes into a running system to observe function calls and data flow without restarts. ([source](https://github.com/vipshop/vjtools/blob/master/docs/other/othertools.md))
- [Heap Memory Monitoring](https://awesome-repositories.com/f/system-administration-monitoring/heap-memory-monitoring.md) — Generates object statistics for the entire heap or survivor space to identify memory leaks. ([source](https://github.com/vipshop/vjtools/blob/master/vjmap/README.md))
- [Generation-Based Statistics](https://awesome-repositories.com/f/system-administration-monitoring/heap-memory-monitoring/generation-based-statistics.md) — Generates object statistics for specific memory generations to identify leaks and rapid growth. ([source](https://github.com/vipshop/vjtools/blob/master/vjmap))
- [Generational Analysis](https://awesome-repositories.com/f/system-administration-monitoring/heap-memory-monitoring/generational-analysis.md) — Statistically analyzes objects within specific memory regions to identify promotion issues and memory leaks.
- [Java Runtime Monitors](https://awesome-repositories.com/f/system-administration-monitoring/java-runtime-monitors.md) — Tracks real-time process metrics, CPU usage, and memory pressure within containerized Java environments.
- [JVM Memory Analysis](https://awesome-repositories.com/f/system-administration-monitoring/memory-inspection/jvm-memory-analysis.md) — Analyzes Java Virtual Machine heap usage and specific memory regions to identify leaks and growth patterns. ([source](https://github.com/vipshop/vjtools/tree/master/vjmap))
- [Metric Collection](https://awesome-repositories.com/f/system-administration-monitoring/metric-collection.md) — Collects and displays real-time OS and runtime metrics without causing application pauses. ([source](https://github.com/vipshop/vjtools/blob/master/vjtop/README.md))
- [JMX Monitoring](https://awesome-repositories.com/f/system-administration-monitoring/monitoring-and-observability/observability-platforms/metric-performance-monitors/jmx-monitoring.md) — Provides a command-line interface for querying and inspecting JMX bean data to monitor JVM performance. ([source](https://github.com/vipshop/vjtools/blob/master/README.md))
- [Hot Thread Analysis](https://awesome-repositories.com/f/system-administration-monitoring/monitoring-and-observability/observability-platforms/metric-performance-monitors/virtual-thread-monitors/thread-activity-monitors/hot-thread-analysis.md) — Tracks CPU usage and memory allocation rates per thread to pinpoint performance bottlenecks. ([source](https://github.com/vipshop/vjtools/blob/master/vjtop))
- [Process Attachment Tools](https://awesome-repositories.com/f/system-administration-monitoring/process-attachment-tools.md) — Allows connecting to a running Java instance using its system process ID to perform diagnostics without startup configuration.
- [Process ID Attachment](https://awesome-repositories.com/f/system-administration-monitoring/process-id-attachment.md) — Accesses a running runtime using its process ID to bypass the need for startup configuration. ([source](https://github.com/vipshop/vjtools/blob/master/vjmxcli))
- [Real-time Performance Monitoring](https://awesome-repositories.com/f/system-administration-monitoring/real-time-performance-monitoring.md) — Tracks real-time process metrics and busy threads using low-overhead data sources. ([source](https://github.com/vipshop/vjtools#readme))
- [Usage Monitoring](https://awesome-repositories.com/f/system-administration-monitoring/usage-monitoring.md) — Monitors memory, CPU, and disk metrics with color-coded alerts for safety threshold breaches. ([source](https://github.com/vipshop/vjtools/blob/master/vjtop/README.md))
- [Cgroup Resource Analyzers](https://awesome-repositories.com/f/system-administration-monitoring/cgroup-resource-analyzers.md) — Provides tools to analyze Linux control group files to determine actual container CPU limits for accurate thread allocation.
- [Metric Threshold Alerting](https://awesome-repositories.com/f/system-administration-monitoring/data-pattern-monitoring/metric-threshold-alerting.md) — Highlights abnormal system values with color-coded warnings when predefined performance thresholds are crossed. ([source](https://github.com/vipshop/vjtools/blob/master/vjtop))
- [JMX Bean Inspections](https://awesome-repositories.com/f/system-administration-monitoring/jmx-bean-inspections.md) — Retrieves specific attribute values from a target runtime by specifying the bean and attribute name. ([source](https://github.com/vipshop/vjtools/blob/master/vjmxcli))
- [GC Log Analyzers](https://awesome-repositories.com/f/system-administration-monitoring/logging-and-telemetry/log-analysis/gc-log-analyzers.md) — Parses garbage collection logs to visualize memory reclamation patterns and identify performance bottlenecks. ([source](https://github.com/vipshop/vjtools/blob/master/docs/other/othertools.md))
- [Generation Boundary Identification](https://awesome-repositories.com/f/system-administration-monitoring/memory-inspection/jvm-memory-analysis/generation-boundary-identification.md) — Retrieves starting and ending memory addresses for different memory generations to facilitate filtered object analysis. ([source](https://github.com/vipshop/vjtools/tree/master/vjmap))
- [Memory Range Identification](https://awesome-repositories.com/f/system-administration-monitoring/memory-inspection/jvm-memory-analysis/memory-range-identification.md) — Prints starting and ending memory addresses of heap generations to facilitate external filtered analysis. ([source](https://github.com/vipshop/vjtools/blob/master/vjmap))
- [Thread Performance Analyzers](https://awesome-repositories.com/f/system-administration-monitoring/monitoring-and-observability/observability-platforms/metric-performance-monitors/virtual-thread-monitors/thread-performance-analyzers.md) — Identifies CPU-intensive threads and retrieves stack traces to pinpoint the exact source of performance issues. ([source](https://github.com/vipshop/vjtools/blob/master/vjtop/README.md))
- [Application Diagnostic Data](https://awesome-repositories.com/f/system-administration-monitoring/monitoring-and-observability/observability-platforms/operational-health-alerting/health-monitoring-endpoints/application-diagnostic-data.md) — Gathers thread dumps, heap histograms, and logs into a single archive for rapid production troubleshooting. ([source](https://github.com/vipshop/vjtools/blob/master/vjdump))
- [Memory Utilization Analysis](https://awesome-repositories.com/f/system-administration-monitoring/performance-monitoring/garbage-collection-monitors/gc-pressure-reduction/memory-utilization-analysis.md) — Provides accurate memory pressure alerts by calculating utilization percentages against maximum available memory. ([source](https://github.com/vipshop/vjtools/blob/master/vjmxcli))
- [Stack Trace Inspections](https://awesome-repositories.com/f/system-administration-monitoring/stack-trace-inspections.md) — Provides capabilities to retrieve stack traces for active or blocked threads to diagnose contention and high CPU usage. ([source](https://github.com/vipshop/vjtools/blob/master/vjtop))

### Testing & Quality Assurance

- [Method Performance Profiling](https://awesome-repositories.com/f/testing-quality-assurance/method-performance-profiling.md) — Tracks method execution times and generates flame graphs to identify CPU hotspots. ([source](https://github.com/vipshop/vjtools/blob/master/docs/other/othertools.md))

### Data & Databases

- [JMX Metric Collectors](https://awesome-repositories.com/f/data-databases/data-analysis-visualization/telemetry-usage-analytics/metrics-collection/jmx-metric-collectors.md) — Implements a command-line interface for querying Java MBean endpoints to retrieve internal state and performance metrics.