Solon 4.0.3 Released: AI Loop, Code Talent, JDK 25 Prep

On July 2, 2026, the Solon team released v4.0.3 — just 22 days after v4.0.0 and 7 days after v4.0.2. Three releases in under a month. The pace tells a clear story: Solon's iteration speed is accelerating, and the focus is firmly on AI Agent infrastructure.

Here's what's new and why it matters.

What's in v4.0.3

The Three Changes That Matter Most

1. solon-ai-loop: The Agent's "Iteration Engine"

This is the most significant new module in this release.

What problem does it solve?

In ReActAgent and TeamAgent, reasoning steps are linear — think, act, observe, done. But many real-world scenarios require agents to loop:

• 
  Code generation: write code → compile fails → read error → fix → recompile → until green


• 
  Automated testing: write tests → run → analyze failure → fix → rerun → until pass


• 
  Data cleaning: clean → validation fails → adjust params → clean again → verify → until合格

solon-ai-loop provides a controlled loop execution framework, allowing agents to iterate until a termination condition is met. It works with the existing StopLoopInterceptor to control max iterations, timeouts, and even manual interruption.

2. solon-ai-talent-code: Code Abilities as a Standalone Module

Before v4.0.3, code-related talents (file reading/writing, shell execution, LSP analysis, etc.) were bundled inside Harness. If you only needed ChatModel + code abilities, you had to pull in the entire Harness.

Now solon-ai-talent-code is independent, giving you a lightweight, focused dependency:

<!-- Code abilities only, no Harness needed -->

<dependency>

    <groupId>org.noear</groupId>

    <artifactId>solon-ai-talent-code</artifactId>

    <version>4.0.3</version>

</dependency>

This makes Harness leaner, and makes code talents reusable in other contexts — like SolonCode CLI, which is itself Harness-driven.

3. JDK 25 ScopeLocal Auto-Loading

JDK 25 is the upcoming LTS release (September 2026), and Solon has a tradition of pre-adapting before the official JDK release.

The ScopeLocalJdk25 auto-load mechanism means: when you upgrade to JDK 25, Solon automatically switches to JDK 25's scoped value implementation — zero code changes, zero config.

This is "compatible with Java 8 ~ Java 25" in action — not just running on new JDKs, but actually leveraging their capabilities.

From M1 to GA: 11 Days

v4.0.3-M1 (milestone) was released in late June 2026, and it took just 11 days to reach GA status.

The v4.0.x release cadence:

Three GA releases in under four months tells us two things:

1. 
   The v4.x core stack is stable — each release is incremental, not firefighting


2. 
   AI ecosystem is the primary iteration focus — all three releases center on AI modules

v4.0.x LTS Support

Per the official LTS plan (