Sam Brannen
7f29df4d79
Prior to this commit, an attempt to restart the StompBrokerRelayMessageHandler (SBRMH) resulted in an IllegalStateException stating that the ReactorNettyTcpClient was still in the process of "Shutting down." The reason is that a ReactorNettyTcpClient cannot be restarted after it has been closed, and that is by design. To address that issue, this commit introduces an `internallyManagedTcpClient` flag in SBRMH that is used to track whether SBRMH is in charge of managing the TcpClient internally or if the TcpClient was supplied by the user and is therefore managed externally. If SBRMH manages the TcpClient internally, isPauseable() returns `true`, and the `tcpClient` field is set to null (in stopInternal()) when the handler is stopped. Consequently, a new internally managed TcpClient will be created when the handler is restarted. If the TcpClient is managed externally, the handler is not considered to be "pauseable", and a reference to the externally managed TcpClient is retained after the handler has been stopped. If the ApplicationContext is subsequently restarted, the externally managed TcpClient will be reused -- which may or may not work, depending on the implementation of the TcpClient. Note, however, that this has always been the behavior of SBRMH with regard to stop/start scenarios for externally managed TcpClients. Closes gh-36266
Spring Framework 
This is the home of the Spring Framework: the foundation for all Spring projects. Collectively the Spring Framework and the family of Spring projects are often referred to simply as "Spring".
Spring provides everything required beyond the Java programming language for creating enterprise applications for a wide range of scenarios and architectures. Please read the Overview section of the reference documentation for a more complete introduction.
Code of Conduct
This project is governed by the Spring Code of Conduct. By participating, you are expected to uphold this code of conduct. Please report unacceptable behavior to spring-code-of-conduct@spring.io.
Access to Binaries
For access to artifacts or a distribution zip, see the Spring Framework Artifacts wiki page.
Documentation
The Spring Framework maintains reference documentation (published and source), GitHub wiki pages, and an API reference. There are also guides and tutorials across Spring projects.
Micro-Benchmarks
See the Micro-Benchmarks wiki page.
Build from Source
See the Build from Source wiki page and the CONTRIBUTING.md file.
Continuous Integration Builds
CI builds are defined with GitHub Actions workflows.
Stay in Touch
Follow @SpringCentral, @SpringFramework, and its team members on 𝕏. In-depth articles can be found at The Spring Blog, and releases are announced via our releases feed.
License
The Spring Framework is released under version 2.0 of the Apache License.