Observed Signal · Jun 28, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Java 25 LTS Arrives; Solon 4.0 Eases Migration
Java 25 LTS is now available and JDK 26 is already released. The article argues many teams face a major migration in 2026 driven by JDK changes, Spring Boot 4's disruptive namespace and library changes, and Oracle's NFTC license expiry for Java 21 in September 2026. It presents Solon 4.0 (released June 10, 2026) as a migration-friendly alternative to Spring Boot: Solon claims compatibility across Java 8–26, first-class GraalVM support, a minimal core, and built-in AI features (MCP protocol support, an AI Sandbox, and a renamed Talent plugin system). Benchmarks cited show large performance and size advantages for Solon 4.0 versus Spring Boot 4.0 on Java 25. The piece provides a migration roadmap and quick-start instructions for adopting Solon during a Java 25 migration.
Java LTS changes plus Oracle NFTC expiry create migration pressure; the Solon 4.0 technical release presents an alternative with claimed broad JDK compatibility and significant performance gains, but this is primarily of developer/platform interest rather than industry-wide AdTech impact.
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Key Takeaways & Evidence Grounding
- Java 25 LTS is available and JDK 26 has been released (article notes JDK 26 is already out).
- Oracle's NFTC license for Java 21 expires in September 2026, creating commercial pressure to migrate off Java 21.
- Solon 4.0 was released June 10, 2026; Solon 4.0.2 already claims support for Java 26 (Project Valhalla previews and structured concurrency) without code changes.
- Solon 4.0 adds MCP protocol support (MCP_2025_11_25) with ServerTransportSecurityValidator, an AI Sandbox (solon-ai-sandbox) for isolated agent execution, and renames its plugin system from 'skill' to 'talent'.
- Benchmarks cited compare Solon 4.0 to Spring Boot 4.0 on Java 25 showing large improvements: startup ~0.18s vs ~1.9s, idle memory ~35MB vs ~250MB, packaged size ~0.7MB vs ~16MB, and QPS ~166k vs ~44k.
Connected Companies & Entities
2 Entities mapped“Oracle's NFTC license for Java 21 expires in September 2026 — meaning millions of enterprise applications need to move to Java 25 or face li...”
“The AI plugin system was renamed from 'skill' to 'talent' to avoid confusion with OpenAI's function-calling 'skills'....”
Ontology Mapping & Concepts
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