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Solon AI

#32 agent frameworkverified Sep 4, 2026v4.1.1

Java AI framework with ReAct and Team agents, tool and skill calling, RAG and MCP, embeddable in Spring Boot, Vert.x or Quarkus

Key differences

Java AI framework with ReAct and Team agents, tool and skill calling, RAG and MCP, embeddable in Spring Boot, Vert.x or Quarkus

  • Runs local. Free and open source under Apache-2.0; you pay whichever model provider you configure
  • Acts as an MCP server. Listed for 23 of 118 tools in this category.
  • Runs local models. Listed for 60 of 118 tools in this category.
  • Keep in mind: Solon AI ships a Team agent alongside the single ReAct agent for multi-agent orchestration.

“A retrieval stack with document loaders, embedding and reranking, shipped to you as a Maven dependency.”

Website Docs 459 starsCompare vs…Dispute a fact
Appeal a claim or request ownership transfer

What it is

Solon AI is the AI subproject of the Solon Java framework. It provides a unified ChatModel interface with per-vendor dialects for OpenAI, Gemini, Claude, Ollama, DeepSeek and Dashscope, function and tool calling, a Talents system for conditionally activated instructions and toolsets, RAG components from document loaders through embedding and reranking, MCP client and server support, and ReAct and Team agents whose reasoning can be turned into an observable computation graph. It runs on Java 8 through 25 and embeds in Solon, Spring Boot, jFinal, Vert.x and Quarkus applications.

Specification

Source verification

Row snapshot checked 2026-09-04. Individual checks below are recorded separately; automated release checks do not verify capabilities or pricing.

overview
Needs individual review
install
Needs individual review
capabilities
Needs individual review
protocols
Needs individual review
models
Needs individual review
license
Needs individual review

Architecture

Type
Agent framework
Runssrc ↗
local
Platforms
macos, linux, windows
Context windowsrc ↗
not documented
Languages
java

Models

Backbonesrc ↗
OpenAI, Gemini, Claude, Ollama, DeepSeek, Dashscope
Bring your own model
Yes
Local models
Yes
Ollama is one of the built-in provider dialects, configured by pointing ChatModel at a local endpoint.

Protocols

MCP clientsrc ↗
Yes
MCP server
Yes
OpenAPI tools
No

Capabilities

Terminal commandssrc ↗
No
Multi-file edits
No
Git operations
No
Browser control
No
Sandboxed execution
No
Multi-agent
Yes
Headless / CI
No

Cost

Modelunsourced
byok
Starts at
$0/mo
Free tier
Yes
Bring your own key
Yes

Free and open source under Apache-2.0; you pay whichever model provider you configure

Openness

Open sourcesrc ↗
Yes
License
Apache-2.0
First release
unknown
open-sourcejavaspring-bootmcpragreact

Los Agentes on Solon AI

Who are they?
The ruling
El JuezThe judge

El Crítico counts the compatibility surface and La Jefa counts the runtimes her teams already ship on; they are describing the same list from opposite ends.

Adopt
Reasoning and trade-offs · AI analysis

El Crítico marks this down because supporting many language versions and several host frameworks is an enormous matrix for one project to keep working. La Jefa marks it up for exactly that reason, since every one of those hosts is already in her estate and nothing new has to be introduced to use it. El Hacker is scoring the protocol support.

La Jefa wins, because breadth is a maintenance problem for the authors and a compatibility gift to the reader, and El Crítico is overruled on whose risk it is. Adopt, if you pin the version and re-test the integration on every host framework upgrade.

Agree with El Juez?
El AmigoThe friend

Pick Solon AI if your services are Java and you want the agent inside them; pick a Python framework if you were going to stand up a separate service for it anyway.

7.0
Reasoning and trade-offs · AI analysis

The deciding trait is that nothing new has to be deployed. The agent becomes part of an existing application rather than a sidecar in another language with its own build, its own container and its own on-call story, which for a team that has spent a decade on one stack is most of the decision made already.

What you give up is the tutorial economy, because almost every example in this field is written in another language. Pick it when the surrounding code decides. Pick Python when the surrounding code does not care.

reliability
7
usefulness
6
cost
8
longevity
7
Agree with El Amigo?
El CríticoThe critic

It claims to run from Java 8 through 25 and to embed in five different host frameworks, which is a compatibility matrix no small project can genuinely keep tested.

6.0
Reasoning and trade-offs · AI analysis

The published breadth is the risk. That span of language versions multiplied by five application containers is a combination count nobody runs on every release, so some of those cells are supported in the sense that nobody has reported a problem yet. The failure that follows is specific and unpleasant: it works in the example and not in your host, and the difference is a version somebody else pinned.

What it does right is put a dialect per vendor behind one interface, so provider quirks stay where they belong.

reliability
5
usefulness
6
cost
7
longevity
6
Agree with El Crítico?
El ProfesorThe professor

Instructions and toolsets are activated conditionally rather than always present, which makes the prompt a function of the situation instead of an accumulating constant.

7.5
Reasoning and trade-offs · AI analysis
  1. Conditional activation is the right answer to the problem every framework eventually hits: static instructions grow monotonically, and each addition dilutes the rest. Making the set a function of context bounds that growth by construction. 2. Rendering an agent's reasoning as an observable computation graph gives the same treatment to control flow, since the path taken becomes an object rather than a narrative.

  2. Neither claim is accompanied by measurement. The reader gets two principled mechanisms and no figure for what either saves or catches.

reliability
8
usefulness
7
cost
8
longevity
7
Agree with El Profesor?
La InversoraThe investor

452 stars, permissively licensed, and this is a subproject of an established framework rather than a company, so the survival question is about the parent's contributor base.

6.8
Reasoning and trade-offs · AI analysis

Being a component of a larger open framework is the most stable position available here. Adoption arrives through the parent's existing users rather than through marketing, there is no investor who needs an exit, and nobody can redirect the roadmap by acquisition because there is nothing to acquire. Four hundred stars understates the reach for that reason.

Moat: inherited distribution inside one language ecosystem, which is real and bounded. Likely path: releases tied to the parent's cadence. Position: the failure mode here is neglect rather than a shutdown, and neglect is survivable.

reliability
7
usefulness
6
cost
7
longevity
7
Agree with La Inversora?
La JefaThe CTO

Nothing to license, and it drops into the application servers my teams already deploy, which means no new runtime, no new container image and no new deployment pipeline.

7.0
Reasoning and trade-offs · AI analysis

This is the cheapest adoption on the board for an organisation like mine, because the expensive part of adopting anything is usually the operational surface it adds. Here there is none: the agent ships inside services that already have logging, deployment, alerting and an on-call rota, so what changes is a dependency rather than an architecture.

It is a library, so there is no console and nothing for developers to install. The real cost is engineering time and the model spend those services incur. Approved with conditions: it ships inside services my platform group already operates, with spend attributed per service.

reliability
7
usefulness
6
cost
8
longevity
7
Agree with La Jefa?
El HackerThe tinkerer

Apache-2.0, and it is both an MCP client and an MCP server, with a built-in dialect that points at a local runtime, so the whole thing runs against weights on my own box.

8.0
Reasoning and trade-offs · AI analysis

Being reachable over the protocol as well as speaking it is the property that turns a library into a component. Whatever I build here is callable from everything else I run, and the tool servers I already operate attach without a wrapper, which is a two-way street almost nobody in this category bothers to pave.

Local inference is a first-class dialect rather than a compatibility note, so the endpoint is whatever I am serving. Permissive licence, so a fork is legal for as long as I need one.

reliability
8
usefulness
7
cost
9
longevity
8
Agree with El Hacker?