The RejectedExecutionException was thrown when the thread executing `Server.start` managed to shut down the `compilerThreadPool` before the thread executing `Server.handleRequest` submitted the compilation task.
This patch removes the extra thread used for `Server.handleRequest`, and executes that method directly in the thread pool. All `compilerThreadPool` uses happen on the `Server.start` thread now, and no new tasks are submitted after the thread pool is shut down. In order to verify the fix, I modified `IdleMonitor.KEEPALIVE` to 1 second. With that change the problem was occasionally reproducible without the patch from this PR. With the patch, the `RejectedExecutionException` problem did not reproduce. No new regression test. Existing langtools tests continue to pass. ------------- Commit messages: - Use threadpool for socket communication Changes: https://git.openjdk.org/jdk/pull/18672/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18672&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8324673 Stats: 19 lines in 2 files changed: 1 ins; 10 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/18672.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18672/head:pull/18672 PR: https://git.openjdk.org/jdk/pull/18672
