Dubbo’s First Post‑Maintenance Release: Major Fixes and Dependency Upgrades

Resolved Issues

Graceful shutdown – the framework now correctly releases thread pools and network resources when a service instance is stopped, preventing hanging connections.

MonitorFilter blocking – monitoring statistics are collected asynchronously, so the filter no longer blocks the RPC invocation path.

Dynamic configuration – consumer‑side configuration changes are applied immediately, and provider‑side dynamic configuration deletions take effect without requiring a restart.

Routing rule parsing – parsing logic for router rules has been fixed, ensuring that user‑defined routing expressions are evaluated and applied as intended.

Async configuration leakage – the async flag is now scoped to the specific method invocation and does not unintentionally propagate to subsequent calls.

Provider concurrency throttling – the concurrency limiter now respects the configured limit accurately, preventing overload of provider threads.

Community bug fixes – a collection of minor bugs reported by the community (e.g., class‑loader issues, serialization edge cases) have been addressed.

Dependency Upgrades

spring : upgraded from 3.2.16.RELEASE to 4.3.10.RELEASE. This brings support for the newer Spring XML schema parsing and enables the HTTP‑based RPC protocol introduced in Spring 4.

zookeeper : upgraded from 3.3.3 to 3.4.9. The newer client provides improved session handling and stability for the default registry implementation.

zkclient : upgraded from 0.1 to 0.10. The API changes include better connection state listeners and retry mechanisms.

curator : upgraded from 1.1.16 to 2.12.0. Enhancements include higher‑level recipes for leader election and distributed locks used by Dubbo’s service discovery.

commons-logging : upgraded from 1.1.1 to 1.2. Aligns Dubbo’s logging abstraction with the latest Commons Logging release.

hessian : upgraded from 4.0.6 to 4.0.38. Improves compatibility with newer Java versions and fixes several serialization bugs.

jedis : upgraded from 2.1.0 to 2.9.0. Enables the Redis‑based registry and cache extensions to use the latest Redis client features.

httpclient : upgraded from 4.1.2 to 4.5.3. Provides a more robust HTTP connection pool used by Hessian and other HTTP transports.

validator : upgraded from 1.0.0 to 1.1.0.Final. Brings full support for the Bean Validation 1.1 specification.

cxf : upgraded from 2.6.1 to 3.0.14. Adds compatibility with newer WebService standards and fixes several CXF‑related integration issues.

jcache : upgraded from 0.4 to 1.0.0. Aligns Dubbo with the JCache (JSR‑107) final specification for cache abstraction.