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https://issues.apache.org/jira/browse/DIRMINA-1169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emmanuel Lécharny resolved DIRMINA-1169.
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Fix Version/s: 2.1.7
2.0.24
2.2.2
Resolution: Fixed
> BindException on Java >= 11 due to race condition in AbstractPollingIoAcceptor
> ------------------------------------------------------------------------------
>
> Key: DIRMINA-1169
> URL: https://issues.apache.org/jira/browse/DIRMINA-1169
> Project: MINA
> Issue Type: Bug
> Affects Versions: 2.0.23, 2.1.6, 2.2.1
> Reporter: Thomas Wolf
> Priority: Major
> Fix For: 2.1.7, 2.0.24, 2.2.2
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> See also SSHD-1256.
> The main acceptor loop does basically (somewhat simplified):
> {code:java}
> while (selectable) {
> registerHandles(); // Process registration queue: add new sockets (from
> bind()) to the selector with OP_ACCEPT, fulfills their open futures
> int selected = select();
> if (/* nothing to do */) {
> break; // and end the thread; higher layers will create a new one if
> needed
> }
> if (selected > 0) {
> processHandles(selectedHandles()); // Handle and hand off new connections
> }
> unregisterHandles(); // Process cancel queue: cancel SelectionKey, close
> ServerSocketChannel, fulfill the cancel future
> }
> {code}
> With Java 11, unbinding a {{ServerSocketChannel}} changed:
> * [JDK-8214430|https://bugs.openjdk.org/browse/JDK-8214430]
> * [Java 11 Release
> Notes|https://www.oracle.com/java/technologies/javase/11-relnote-issues.html#JDK-8198562]
> Essentially the unbind gives up the socket only at the next {{select()}}
> call. This causes two problems in Apache MINA's acceptor:
> * The unbind future is set "done" before the socket is actually released.
> * If a new binding for one of the unbound sockets is registered before that
> {{select()}} has been done, {{registerHandles()}} gets a {{BindException}}
> ("address already in use").
> So for Java >= 11, the code must ensure that there is a {{select()}} between
> processing unbindings and processing new bindings, and the unbind futures
> must be set "done" only after that {{select()}}.
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