Open-Source Observability · javamelody

javamelody

JavaMelody is an open-source Application Performance Monitoring (APM) tool designed to monitor Java and Java EE applications in QA and production. It provides real-time metrics, charts, and performance insights without requiring code changes, via a lightweight servlet filter.

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Source: GitHub — github.com/javamelody/javamelody

GitHub stars

752

Forks

Java

Primary language

Apache-2.0

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	javamelody/javamelody
Owner	javamelody
Primary language	Java
License	Apache-2.0 — OSI-approved
Stars	3k
Forks	752
Open issues	37
Latest release	javamelody-core-2.8.0 (2026-05-24)
Last updated	2026-07-05
Source	https://github.com/javamelody/javamelody

What javamelody is

JavaMelody is a Java-based APM framework that instruments applications through a servlet filter to collect metrics on CPU, memory, HTTP requests, database operations, and method execution times. It exposes collected data via a web UI and supports export to external monitoring systems.

Quickstart

Get the javamelody source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/javamelody/javamelody.git2cd javamelody3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Real-time Performance Visibility in Production Java Applications

Monitor CPU, memory, HTTP latency, and database query performance with minimal overhead, enabling quick identification of bottlenecks in live environments.

Low-Touch Integration into Existing Java EE / Spring Applications

Add monitoring via a simple servlet filter configuration without modifying application code, suitable for teams seeking quick APM deployment.

QA and Staging Performance Testing

Capture detailed metrics during load testing and pre-production validation to identify performance regressions before production release.

Implementation considerations

Requires Java runtime; deployment via servlet filter in WAR/application classpath; verify JVM version compatibility with target application.
In-memory metric storage by default; assess retention policy needs and configure external persistence if long-term data archival is required.
Introduces JVM overhead (CPU, memory) for metric collection; benchmark in staging to ensure acceptable performance impact for your workload.
Web UI exposed on dedicated port; plan network/firewall access and authentication (e.g., reverse proxy, API gateway) for production safety.
No native support for asynchronous frameworks (Project Reactor, Vert.x) documented; verify compatibility with reactive Java stacks.

When to avoid it — and what to weigh

Microservices with Distributed Tracing Requirements — JavaMelody lacks built-in distributed tracing (e.g., OpenTelemetry, Jaeger support). Multi-service architectures need centralized trace correlation.
Serverless or Function-as-a-Service Workloads — Designed for long-running JVM applications; not applicable to ephemeral serverless functions or containers with strict memory constraints.
Non-Java Polyglot Environments — Monitoring limited to Java; teams running mixed Python, Node.js, Go services require platform-agnostic APM solutions.
Enterprise-Grade Multi-Tenancy or Complex RBAC Needs — Project is community-driven with no documented advanced security, user management, or role-based access control features for enterprise SaaS.

License & commercial use

Licensed under Apache License 2.0 (SPDX: Apache-2.0), a permissive OSI-approved license.

Apache 2.0 permits commercial use, modification, and distribution with minimal restrictions (retain license notice, state changes). No warranty or liability. Suitable for proprietary applications. Review your legal team's Apache 2.0 requirements if modifying the source.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Adequate
License clarity	Clear
Deployment complexity	Moderate
DEV.co fit	Good
Assessment confidence	High

Security considerations

Web UI is network-exposed and may leak performance data (method names, database queries, memory usage); no authentication mechanism documented. Deployed applications must restrict UI access via firewall, reverse proxy, or API gateway. Metric collection via reflection on running code; verify instrumentation does not expose sensitive payloads. No documented security audit or vulnerability disclosure process; check GitHub issues and advisories.

Alternatives to consider

Elastic APM (Elastic Observability)

Full-stack APM with distributed tracing, log aggregation, and SaaS/self-hosted options; heavier but more feature-complete for enterprise.

New Relic

SaaS APM with strong Java support, distributed tracing, and managed infrastructure; higher cost but turnkey and secure by default.

Datadog

Comprehensive observability platform supporting Java, distributed tracing, and integrations; enterprise-grade but vendor-locked and expensive.

Software development agency

Build on javamelody with DEV.co software developers

JavaMelody offers a low-friction way to monitor Java applications. Evaluate its fit for your architecture—especially distributed tracing and enterprise security needs—then pilot in staging. Contact our team if you need guidance integrating APM into your DevOps pipeline.

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javamelody FAQ

Does JavaMelody support distributed tracing across microservices?

Not natively. JavaMelody is single-JVM focused. For microservices, you must integrate with OpenTelemetry, Jaeger, or Zipkin via custom code or third-party extensions; this is not documented as out-of-the-box.

How much CPU and memory overhead should I expect?

Unknown—not specified in provided data. Conduct load testing in your staging environment with your typical traffic profile. Monitor JVM metrics before and after enabling JavaMelody.

Can I use JavaMelody in a Kubernetes cluster?

Yes, as a Java library in your Docker image. No native Kubernetes integration (e.g., Prometheus exporter) is documented; manual exposure of metrics to cluster monitoring required.

Is there commercial support or SLA?

Unknown. This is a community-driven open-source project. No commercial support vendor, SLA, or enterprise license option is evident from the provided data.

Work with a software development agency

Need help beyond evaluating javamelody? DEV.co is a software development agency offering software development services and web development for teams of every size. Our software developers and web developers build custom software, web applications, APIs, and open-source observability integrations — and maintain them long-term.

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