I've found the source of the SMTPAppender issues. It with the
ThreadPoolExecutor defined in the ContextBase class
// 0 idle threads, 2 maximum threads, no idle waiting
ExecutorService executorService = new ThreadPoolExecutor(0, 2, 0L,
TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>());
If you increase the first parameter (which is the initial pool size) from 0 to
2, then it works as expected in both JRE 1.5 and 1.6.
-dave
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