Spring Boot 4.2 Redis: Why database=5 Really Meant db0 (2026)
On Spring Boot 4.1.2, spring.data.redis.database=5 binds correctly, but master/replica connections are built for db0. I ran 12 cases against 4.2.0-RC2.
Read moreSpring Boot 4 Migration
Upgrading to Spring Boot 4 and Spring Framework 7: Jakarta EE 11, Security 7, Jackson 3, and the silent behaviour changes tests catch first.
11 articles
Spring Boot 4.2 Properties Migrator: Four Gaps That Stay Silent
Tested spring.properties.migrator.fail in 4.2.0-RC1: on-error skips renamed keys, @PropertySource is invisible, and typos stay silent.
Read moreHibernate 7 Migration: Check Schema, Query Types, and Time Values
Verify a Hibernate upgrade against existing schema and data. Separate naming, native-query mappings, temporal semantics, and performance checks.
Read moreSpring Boot Method Security: Verify @PreAuthorize Is Active
Check method-security configuration, proxy invocation, and allowed and denied identities after an upgrade. An annotation alone is not enforcement.
Read moreSpring Boot 3.5 to 4: A Runnable Verification Lab
Run a Java 17 project on Boot 3.5.7 and 4.0.0. Inspect CSRF, real HTTP error dispatch, Flyway history, and two deliberately failing checks.
Read moreReviewing Copilot Spring Boot 4 PRs: Evidence and Gaps
Two public migration PRs illustrate how to separate proposed changes, reported build results, and the evidence needed to approve a Boot 4 upgrade.
Read moreSpring Boot 4 YAML: Verify Sources, Binding, and Behavior
Audit application.yml after a Boot 4 change without treating metadata, migrator output, or an actuator response as complete proof of configuration.
Read moreSpring Boot 4 Dependencies: Resolved Does Not Mean Configured
Diagnose a Boot 4 dependency that resolves and compiles but does not activate its feature. Check integration modules, conditions, beans, and behavior.
Read moreFlyway Checksum Mismatch: Restore History Before Repair
Diagnose edited migrations, preserve applied SQL, and distinguish Flyway metadata repair from a real schema correction before changing a database.
Read moreSpring Boot 4 403: Diagnose CSRF and Verify the Security Chain
Distinguish CSRF, authentication, authorization, and missing test filters. Verify a scoped security change without weakening protection for a green build.
Read moreSpring Boot 4 Migration: Choose the Contracts to Verify
Scope a Boot 4 upgrade around JSON, security, persistence and configuration contracts. Choose the right checks before following the runnable case study.
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