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6/28/2026
Spring Boot 3.5 EOL Is Coming June 30: 115 Breaking Changes and Why Solon 4.0 Won't Care

Spring Boot 3.5 EOL Is Coming June 30: 115 Breaking Changes and Why Solon 4.0 Won't Care

Short summary

Spring Boot 3.5 and Framework 6.2 reach EOL June 30, 2026, forcing teams to upgrade to Boot 4 (115+ breaking changes), pay for extended support, or explore lighter alternatives. Immediate prep work: clear deprecation warnings, expand test coverage, audit framework-specific code.

  • •Spring Boot 3.5 EOL June 30 requires migration to Boot 4, extended support contracts, or alternative frameworks like Quarkus/Micronaut
  • •Boot 4 introduces 115+ breaking changes: Jackson 3 migration, Undertow removal, @MockBean renaming, and module reorganization
  • •Start now: clear deprecation warnings, upgrade to latest 3.5.x patches, expand integration tests, and audit framework-specific usage

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