'transport closed' not catch on CAJMonitor.clear

[ddequidt]

3 days after deploying jca-2.4.12 fixing #87 for ByteBuffer corruption on reconnect, a new error start to raise many times in the console log with same behaviour for the end user on webopi (all pvs appear disconnected).

2026-06-24 06:38:18.262 SEVERE [Thread 192] com.cosylab.epics.caj.CAJChannel (destroyAllMonitors) -
java.lang.IllegalStateException: transport closed
        at com.cosylab.epics.caj.impl.CATransport.submit(CATransport.java:888)
        at com.cosylab.epics.caj.impl.requests.AbstractCARequest.submit(AbstractCARequest.java:88)
        at com.cosylab.epics.caj.CAJMonitor.clear(CAJMonitor.java:141)
        at com.cosylab.epics.caj.CAJChannel.destroyAllMonitors(CAJChannel.java:1213)
        at com.cosylab.epics.caj.CAJChannel.destroyChannel(CAJChannel.java:414)
        at com.cosylab.epics.caj.CAJContext.destroyChannel(CAJContext.java:1107)
        at com.cosylab.epics.caj.CAJChannel.destroy(CAJChannel.java:383)
        at com.cosylab.epics.caj.CAJChannel.destroy(CAJChannel.java:368)
        at org.diirt.support.ca.JCAChannelHandler.disconnect(JCAChannelHandler.java:569)
        at org.diirt.datasource.MultiplexedChannelHandler.guardedDisconnect(MultiplexedChannelHandler.java:323)
        at org.diirt.datasource.MultiplexedChannelHandler.removeWrite(MultiplexedChannelHandler.java:279)
        at org.diirt.datasource.DataSource$4.run(DataSource.java:337)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at java.base/java.lang.Thread.run(Thread.java:833)

and then few minutes later

2026-06-24 06:40:19.371 WARNING [Thread 717880] org.csstudio.opibuilder.util.ErrorHandlerUtil (handleError) - Error from pv connection layer:
java.lang.IllegalStateException: No channel transport available, channel disconnected.
        at com.cosylab.epics.caj.CAJChannel.get(CAJChannel.java:989)
        at org.diirt.support.ca.JCAChannelHandler.setup(JCAChannelHandler.java:336)
        at org.diirt.support.ca.JCAChannelHandler$3$1.run(JCAChannelHandler.java:439)
        at java.base/java.lang.Thread.run(Thread.java:833)

2026-06-24 06:40:19.371 SEVERE [Thread 203] com.cosylab.epics.caj.CAJChannel (updateSubscriptions) -
java.nio.channels.ClosedChannelException
        at java.base/sun.nio.ch.SocketChannelImpl.ensureOpenAndConnected(SocketChannelImpl.java:215)
        at java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:527)
        at com.cosylab.epics.caj.impl.CATransport.noSyncSend(CATransport.java:676)
        at com.cosylab.epics.caj.impl.CATransport.submit(CATransport.java:866)
        at com.cosylab.epics.caj.impl.requests.AbstractCARequest.submit(AbstractCARequest.java:88)
        at com.cosylab.epics.caj.impl.requests.EventAddRequest.updateSubscription(EventAddRequest.java:141)
        at com.cosylab.epics.caj.CAJChannel.updateSubscriptions(CAJChannel.java:1328)
        at com.cosylab.epics.caj.CAJChannel.transportResponsive(CAJChannel.java:547)
        at com.cosylab.epics.caj.impl.CATransport.responsiveTransport(CATransport.java:1088)
        at com.cosylab.epics.caj.impl.CATransport.echoNotify(CATransport.java:1039)
        at com.cosylab.epics.caj.impl.handlers.EchoResponse.internalHandleResponse(EchoResponse.java:45)
        at com.cosylab.epics.caj.impl.handlers.AbstractCAResponseHandler.handleResponse(AbstractCAResponseHandler.java:110)
        at com.cosylab.epics.caj.impl.CAResponseHandler.handleResponse(CAResponseHandler.java:139)
        at com.cosylab.epics.caj.impl.CATransport.processRead(CATransport.java:519)
        at com.cosylab.epics.caj.impl.CATransport.processRead(CATransport.java:431)
        at com.cosylab.epics.caj.impl.CATransport.handleEvent(CATransport.java:369)
        at com.cosylab.epics.caj.impl.reactor.lf.LeaderFollowersHandler.handleEvent(LeaderFollowersHandler.java:77)
        at com.cosylab.epics.caj.impl.reactor.Reactor.processInternal(Reactor.java:404)
        at com.cosylab.epics.caj.impl.reactor.Reactor.process(Reactor.java:288)
        at com.cosylab.epics.caj.impl.reactor.lf.LeaderFollowersHandler.run(LeaderFollowersHandler.java:91)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at java.base/java.lang.Thread.run(Thread.java:833)

2026-06-24 06:40:19.371 SEVERE [Thread 203] com.cosylab.epics.caj.impl.CATransport (responsiveTransport) -
java.lang.NullPointerException

2026-06-24 06:40:19.372 SEVERE [Thread 203] com.cosylab.epics.caj.impl.CATransport (responsiveTransport) -
java.lang.NullPointerException

Looks like java.lang.IllegalStateException thrown at

jca/src/core/com/cosylab/epics/caj/impl/CATransport.java

Line 888 in a0fb7c9

throw new IllegalStateException("transport closed");

should be catched at

jca/src/core/com/cosylab/epics/caj/CAJMonitor.java

Line 142 in a0fb7c9

} catch (IOException ioex) {

for the following lines to be executed in order to properly cancel request and unregister monitor