Top Tweets for #SpringBoot4
Spring Boot 4 unlocks a whole chapter on distributed SQL. Jakarta EE alignment, null safety, resilience annotations, and more got this author excited. #SpringBoot4 #Java #CockroachDB
π‘ Spring Boot 4: Turn on virtual threads. Waiting on HTTP gets cheaper.
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Set spring.threads.virtual.enabled=true
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Keep your normal RestClient code
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More API calls waiting at once, fewer heavy OS threads
#SpringBoot4 #VirtualThreads
π Spring Boot 4: Dedicated RestClient starter.
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spring-boot-starter-restclient for imperative HTTP
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WebClient β spring-boot-starter-webclient
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Unified spring.http.clients.* settings
#SpringBoot4 #RestClient
π Understanding the new defaults can save hours of debugging after deployment. #SpringBoot4
π Spring Boot 4: Kotlin Serialization gets a first-class starter.
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spring-boot-starter-kotlinx-serialization-json
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Contributes a Json bean + HTTP converter
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Configure via spring.kotlinx.serialization.json.*
#SpringBoot4 #Kotlin
π Spring Boot 4: Flyway/Liquibase now need their starters.
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Third-party jar alone is not enough
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Use spring-boot-starter-flyway / liquibase
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Matching *-test starters for test slices
#SpringBoot4 #Flyway
π Spring Boot 4: Test starters follow spring-boot-starter-*-test.
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Each tech has a matching test starter
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They pull spring-boot-starter-test transitively
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Example: Security tests need β¦-security-test
#SpringBoot4 #Testing
π Spring Boot 4: Redis observability uses the Observation API.
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Metrics and spans from Redis commands
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Pair with the OpenTelemetry starter
#SpringBoot4 #Redis
π Spring Boot 4: Disable console logging with one property.
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logging.console.enabled=false
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Useful in containers that only scrape files/OTLP
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Keep file or remote appenders as needed
#SpringBoot4 #Logging
π Spring Boot 4: MongoDB health no longer needs Spring Data.
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Indicators live in spring-boot-mongodb
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Works with the MongoDB driver alone
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Use spring-boot-starter-mongodb when you need health
#SpringBoot4 #MongoDB
π Spring Boot 4: Redis static master/replica (Lettuce).
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Set https://t.co/wXIk1SnGcz.redis.masterreplica.nodes
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Reads can go to replicas
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Lettuce-only, not Jedis
#SpringBoot4 #Redis
π Spring Boot 4: @ConfigurationPropertiesSource for external types.
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Metadata for types living in another module
#SpringBoot4 #Config
π‘ Spring Boot 4: Stack multiple TaskDecorators for async work.
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Each one can copy context to the worker thread
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Spring Boot combines and orders them with @Order
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Typical pair: MDC (logs) + security (user)
#SpringBoot4 #Async
π Spring Boot 4: New JmsClient alongside JmsTemplate.
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Fluent, modern JMS API auto-configured
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JmsTemplate still works unchanged
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Prefer JmsClient for new messaging code
#SpringBoot4 #JMS
π Spring Boot 4: spring-boot-starter-web becomes spring-boot-starter-webmvc.
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Name matches the stack (MVC vs WebFlux)
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Pair with spring-boot-starter-webmvc-test
#SpringBoot4 #WebMVC
π Spring Boot 4: Prefer RestTestClient over TestRestTemplate.
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Fluent API aligned with RestClient
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Works with MockMvc or a real port
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Add @AutoConfigureRestTestClient when needed
#SpringBoot4 #RestTestClient
π Spring Boot 4: New spring-boot-starter-opentelemetry.
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OTLP metrics + traces in one starter
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Auto-configures the OpenTelemetry SDK
#SpringBoot4 #OpenTelemetry
π Spring Boot 4: JSpecify null-safety enforcement.
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Clearer @Nullable / @NonNull contracts
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Better static analysis in IDEs
#SpringBoot4 #JSpecify
π‘ Spring Boot 4: Undertow is gone, use Tomcat or Jetty.
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No Servlet 6.1 Undertow compatibility
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Swap starter-undertow for Tomcat (default) or Jetty
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Donβt deploy Boot 4 to older servlet containers
#SpringBoot4 #Servlet
π‘ Spring Boot 4: To move config keys, use properties-migrator as a temporary guide.
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Add startup and logs tell you which keys are deprecated
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Update the keys, then delete the dependency
#SpringBoot4 #Migration
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