Jolokia MCP Server

Jolokia MCP Server

MCP server for Jolokia, a JMX-HTTP bridge for Java applications. This MCP server enables an LLM to manage a Java application using JMX API via Jolokia.

https://github.com/user-attachments/assets/624ec93b-da69-49b5-be8f-02f2ff14bd2e

Distributions

Since version 0.4, the Jolokia MCP Server offers two distinct distributions to suit different deployment needs:

• Standalone MCP Server
• JVM Agent MCP Server

Standalone MCP Server

The Standalone MCP Server acts as a conventional MCP server; it is registered to the MCP host with either stdio or HTTP, and the MCP server itself communicates with your Java application, which must have a Jolokia agent attached, via JMX over HTTP.

To use the Standalone MCP Server, you'll first need to attach a Jolokia agent to your Java application. For detailed instructions on how to do this, please refer to the Jolokia manual: https://jolokia.org/reference/html/manual/agents.html

JVM Agent MCP Server

In contrast, the JVM Agent MCP Server provides a streamlined, "drop-in" replacement for the standard Jolokia JVM Agent.

With this distribution, you simply attach the MCP Server's JVM Agent to your application instead of the standard Jolokia JVM Agent. The JVM Agent MCP Server then directly opens an HTTP port for the MCP protocol, effectively transforming your Java application itself into an MCP Server.

Features

This MCP server connects to a single JVM at startup and provides the following features on the connected JVM:

• List MBeans from the connected JVM
• List operations for a MBean
• List attributes for a MBean
• Read/write attributes of a MBean
• Execute operations on a MBean

Tools

This MCP server provides 6 tools.

• listMBeans
  • List available MBeans from the JVM
  • Output (List<String>): List of all MBean object names in the JVM
• listMBeanOperations
  • List available operations for a given MBean
  • Inputs:
    • mbean (String): MBean name
  • Output (String): JSON-formatted definitions of all available operations for the given MBean
• listMBeanAttributes
  • List available attributes for a given MBean
  • Inputs:
    • mbean (String): MBean name
  • Output (String): JSON-formatted definitions of all available attributes for the given MBean
• readMBeanAttribute
  • Read an attribute from a given MBean
  • Inputs:
    • mbean (String): MBean name
    • attribute (String): Attribute name
  • Output (String): String representation of the given attribute's value or "null"
• writeMBeanAttribute
  • Set the value to an attribute of a given MBean
  • Inputs:
    • mbean (String): MBean name
    • attribute (String): Attribute name
    • value (Object): Attribute value
  • Output (String): String representation of the given attribute's previous value or "null"
• executeMBeanOperation
  • Execute an operation on a given MBean
  • Inputs:
    • mbean (String): MBean name
    • operation (String): Operation name
    • args (Object[]): Arguments
  • Output (String): String representation of the return value of the operation or "null"

Jolokia Version Compatibility

The following table shows the Jolokia versions compatible with each release of jolokia-mcp-server.

jolokia-mcp-server	Jolokia
0.6.x	2.6.1 – 2.6.3
0.5.x	2.4.3 – 2.6.0
0.4.x	2.2.9 – 2.4.3
0.3.x	2.2.8 – 2.2.9
0.2.x	2.2.8
0.1.x	2.2.8

Install

Standalone

Download the MCP server runner jar:

• jolokia-mcp-server-0.6.1-runner.jar

To install the Jolokia MCP server to a MCP host, add the following entry to the MCP settings:

{
  "mcpServers": {
    "jolokia": {
      "command": "java",
      "args": [
        "-jar",
        "<path-to-the-runner-jar>/jolokia-mcp-0.6.1-runner.jar"
      ]
    }
  }
}

Or if you prefer using JBang (no need for downloading the jar with this method):

{
  "mcpServers": {
    "jolokia": {
      "command": "jbang",
      "args": [
        "org.jolokia.mcp:jolokia-mcp-server:0.6.1:runner"
      ]
    }
  }
}

JVM Agent

Download the MCP server javaagent jar:

• jolokia-mcp-agent-jvm-0.6.1-javaagent.jar

Then run your Java application with -javaagent option:

java -javaagent:jolokia-mcp-agent-jvm-0.6.1-javaagent.jar -jar your-app.jar

This would open the MCP HTTP transport at http://localhost:8779/mcp.

To register the Jolokia MCP server to a MCP host, add the following entry to the MCP settings:

{
  "mcpServers": {
    "jolokia": {
      "httpUrl": "http://localhost:8779/mcp"
    }
  }
}

Run

Run it with java -jar:

java -jar jolokia-mcp-server-0.6.1-runner.jar [Jolokia URL]

Using JBang, you can directly run it with the Maven GAV (org.jolokia.mcp:jolokia-mcp-server:0.6.1:runner):

jbang org.jolokia.mcp:jolokia-mcp-server:0.6.1:runner

HTTP Transport

By default, this MCP server runs with stdio transport. To switch it to HTTP transport, use the --http option:

java -jar jolokia-mcp-server-0.6.1-runner.jar --http

The HTTP transport endpoint by default launches at http://localhost:8080/mcp.

Config Options

Parameter/Option	Default	Description
Positional parameter	http://localhost:8778/jolokia	The Jolokia endpoint URL the MCP server connects to
--http	false (stdio)	Enable HTTP transport
--sse	false (stdio)	Deprecated. Use --http
--port=<number>	8080	The port for the HTTP endpoint. Equivalent to -Dquarkus.http.port=<number>. When the option is set, HTTP is always enabled
--method=<GET|POST>		Preferred HTTP method for Jolokia requests (GET or POST). Equivalent to -Djolokia.mcp.preferred-http-method=<method>
-D*=*		System properties

The system properties that are relevant to the MCP server:

System property	Default	Description
quarkus.http.port	8080	(HTTP) The port for the HTTP endpoint
jolokia.mcp.url	http://localhost:8778/jolokia	Equivalent to the positional parameter
jolokia.mcp.preferred-http-method	Not set	Preferred HTTP method for Jolokia requests (GET or POST)

Build

mvn clean install