Jolokia Monitoring

📊 Jolokia Monitoring & JMX Integration

📡 Overview

MAPS Messaging integrates with Jolokia, a JMX-over-HTTP bridge that allows you to monitor and interact with internal server metrics and Java Management Extensions (JMX) remotely. This is useful for debugging, live metric inspection, and integration with monitoring platforms like Prometheus, Grafana, or custom dashboards.

Jolokia configuration is defined in jolokia.yaml.

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⚙️ Basic Configuration

jolokia:
  enable: false
  config:
    port: 8778
    host: 0.0.0.0
    backlog: 10
    canonicalNaming: true

Field	Description
enable	Enables/disables Jolokia plugin.
port	TCP port used by the Jolokia HTTP agent.
host	Bind address (e.g., 0.0.0.0 for all interfaces).
backlog	Max number of incoming connections to queue.
canonicalNaming	Controls JMX object naming style.

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🧠 Advanced Monitoring Settings

    historyMaxEntries: 10
    maxDepth: 7
    maxCollectionSize: 200
    allowDnsReverseLookup: false
    cors: false

Field	Description
historyMaxEntries	Number of metric history snapshots to keep.
maxDepth	Recursion depth for complex object serialization.
maxCollectionSize	Max size of arrays or collections returned via API.
allowDnsReverseLookup	Whether to enable reverse DNS lookups.
cors	Enable CORS access to the Jolokia endpoint.

---

🐞 Debugging & Error Handling

    debug: true
    debugMaxEntries: 100
    includeStackTrace: false
    allowErrorDetails: false
    serializeException: false

These fields control how much diagnostic information Jolokia will capture and expose.

⚠️ Set all debugging options to false in production to avoid sensitive data leakage.

---

🌍 Discovery Configuration

    discoveryEnabled: false
    multicastGroup: 239.192.48.48
    multicastPort: 24884

Field	Description
discoveryEnabled	Enables auto-discovery via multicast
multicastGroup	Multicast group for Jolokia discovery protocol
multicastPort	Port used for multicast announcements

---

🔐 SSL Configuration (Optional)

Jolokia supports optional SSL/TLS encryption:

#    keystore: my-keystore.jks
#    serverCert: serverCertName
#    serverKey: serverKeyName
#    sslProtocol: TLSv1.2
#    keyStoreType: JKS
#    keyManagerAlgorithm: SunX509
#    trustManagerAlgorithm: SunX509
#    useSslClientAuthentication: false

You can configure secure sockets by uncommenting and setting the appropriate key/trust store details.

🛡️ Consider enabling sslProtocol, certificate validation, and secure ciphers for external monitoring setups.

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🚀 Example Use Case

Expose live heap memory usage and thread metrics to Prometheus or Grafana:

• Enable Jolokia on a secure port
• Integrate with a Prometheus JMX exporter
• Configure Grafana dashboards to pull metrics

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✅ Best Practices

• Enable Jolokia only on secure/internal interfaces.
• Disable debugging and stack traces in production.
• Use HTTPS + authentication to restrict access.
• Integrate with observability tools via JMX bridges or exporters.
• Avoid excessive history/maxCollectionSize settings to preserve performance.

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