I attached a stacktrace of the two threads, which are in a deadlock.
Jon maybe right, when saying the write stack is threadsafe, the problem is,
that simultaneously
a read operation is going on, and both stacks use the same filters.
Thread "NioProcessor-2":
flushScheduledEvents():308, SslHandler {org.apache.mina.filter.ssl}
messageReceived():534, SslFilter {org.apache.mina.filter.ssl}
callNextMessageReceived():542, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
access$1300():48, DefaultIoFilterChain {org.apache.mina.core.filterchain}
messageReceived():943, DefaultIoFilterChain$EntryImpl$1
{org.apache.mina.core.filterchain}
messageReceived():153, ProxyFilter {org.apache.mina.proxy.filter}
callNextMessageReceived():542, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
access$1300():48, DefaultIoFilterChain {org.apache.mina.core.filterchain}
messageReceived():943, DefaultIoFilterChain$EntryImpl$1
{org.apache.mina.core.filterchain}
messageReceived():109, IoFilterAdapter {org.apache.mina.core.filterchain}
callNextMessageReceived():542, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
fireMessageReceived():535, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
read():684, AbstractPollingIoProcessor {org.apache.mina.core.polling}
process():638, AbstractPollingIoProcessor {org.apache.mina.core.polling}
process():627, AbstractPollingIoProcessor {org.apache.mina.core.polling}
access$600():68, AbstractPollingIoProcessor {org.apache.mina.core.polling}
run():1096, AbstractPollingIoProcessor$Processor {org.apache.mina.core.polling}
run():64, NamePreservingRunnable {org.apache.mina.util}
runWorker():1142, ThreadPoolExecutor {java.util.concurrent}
run():617, ThreadPoolExecutor$Worker {java.util.concurrent}
run():745, Thread {java.lang}
Thread "FixMessageProcessor(0)::ABFX":
writeData():209, ProxyFilter {org.apache.mina.proxy.filter}
filterWrite():192, ProxyFilter {org.apache.mina.proxy.filter}
callPreviousFilterWrite():625, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
access$1500():48, DefaultIoFilterChain {org.apache.mina.core.filterchain}
filterWrite():953, DefaultIoFilterChain$EntryImpl$1
{org.apache.mina.core.filterchain}
flushScheduledEvents():316, SslHandler {org.apache.mina.filter.ssl}
filterWrite():653, SslFilter {org.apache.mina.filter.ssl}
callPreviousFilterWrite():625, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
access$1500():48, DefaultIoFilterChain {org.apache.mina.core.filterchain}
filterWrite():953, DefaultIoFilterChain$EntryImpl$1
{org.apache.mina.core.filterchain}
filterWrite():321, ProtocolCodecFilter {org.apache.mina.filter.codec}
callPreviousFilterWrite():625, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
access$1500():48, DefaultIoFilterChain {org.apache.mina.core.filterchain}
filterWrite():953, DefaultIoFilterChain$EntryImpl$1
{org.apache.mina.core.filterchain}
filterWrite():877, DefaultIoFilterChain$TailFilter
{org.apache.mina.core.filterchain}
callPreviousFilterWrite():625, DefaultIoFilterChain
{org.apache.mina.core.filterchain}
fireFilterWrite():618, DefaultIoFilterChain {org.apache.mina.core.filterchain}
write():530, AbstractIoSession {org.apache.mina.core.session}
write():474, AbstractIoSession {org.apache.mina.core.session}
send():51, IoSessionResponder {quickfix.mina}
send():2534, Session {quickfix}
sendRaw():2466, Session {quickfix}
send():2519, Session {quickfix}
sendToTarget():635, Session {quickfix}
sendMessageToTarget():529, FixApplication {de.digitec.d3.gateway.fix}
subscribe():52, FixProducerHandle {de.digitec.d3.gateway.fix}
subscribe():134, FixApplication {de.digitec.d3.gateway.fix}
processMessage():288, FixMessageProcessor {de.digitec.d3.gateway.fix}
run():245, FixMessageProcessor {de.digitec.d3.gateway.fix}
run():878, FixApplication$MessageProcessorThread {de.digitec.d3.gateway.fix}
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