Experimental Physics and
Industrial Control System

"Carcassi, Gabriele" <[email protected]> · Tue, 7 May 2013 21:32:28 +0000

Hi Marcus:

Pushed a change in the 3.1.x branch on github:
https://github.com/ControlSystemStudio/cs-studio/commits/3.1.x
I believe it should fix the issue, though I am not setup to test that branch... So, let me know if it doesn't. 

Gabriele

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Tuesday, May 07, 2013 10:08 AM
To: [email protected]
Subject: CSS 3.1.x PVManager / JCA ClassCastException

Hello,

while using the PVManager inside of CSS 3.1 I got the following error:

2013-04-30 14:03:03,341 WARN  [main] de.ptb.epics.eve.util.pv.PVWrapper:
*************: gov.aps.jca.dbr.DBR_TIME_Int cannot be cast to gov.aps.jca.dbr.DBR_TIME_Short
java.lang.ClassCastException: gov.aps.jca.dbr.DBR_TIME_Int cannot be cast to gov.aps.jca.dbr.DBR_TIME_Short
    at org.epics.pvmanager.jca.JCAVTypeAdapterSet$4.createValue
(JCAVTypeAdapterSet.java:63)
    at org.epics.pvmanager.jca.JCAVTypeAdapterSet$4.createValue
(JCAVTypeAdapterSet.java:1)
    at org.epics.pvmanager.jca.JCATypeAdapter.updateCache
(JCATypeAdapter.java:93)
    at org.epics.pvmanager.jca.JCATypeAdapter.updateCache
(JCATypeAdapter.java:1)
    at org.epics.pvmanager.MultiplexedChannelHandler
$MonitorHandler.processValue(MultiplexedChannelHandler.java:49)
    at org.epics.pvmanager.MultiplexedChannelHandler.processMessage
(MultiplexedChannelHandler.java:276)
    at org.epics.pvmanager.jca.JCAChannelHandler.access$8
(JCAChannelHandler.java:1)
    at org.epics.pvmanager.jca.JCAChannelHandler$2.monitorChanged
(JCAChannelHandler.java:249)
    at gov.aps.jca.event.DirectEventDispatcher.dispatch
(DirectEventDispatcher.java:84)
    at com.cosylab.epics.caj.CAJMonitor.monitorChanged(CAJMonitor.java:251)
    at gov.aps.jca.event.DirectEventDispatcher.dispatch
(DirectEventDispatcher.java:155)
    at com.cosylab.epics.caj.impl.requests.EventAddRequest.response
(EventAddRequest.java:213)
    at
com.cosylab.epics.caj.impl.handlers.EventAddResponse.internalHandleResponse
(EventAddResponse.java:57)
    at
com.cosylab.epics.caj.impl.handlers.AbstractCAResponseHandler.handleResponse
(AbstractCAResponseHandler.java:110)
    at com.cosylab.epics.caj.impl.CAResponseHandler.handleResponse
(CAResponseHandler.java:139)
    at com.cosylab.epics.caj.impl.CATransport.processRead
(CATransport.java:530)
    at com.cosylab.epics.caj.impl.CATransport.processRead
(CATransport.java:412)
    at com.cosylab.epics.caj.impl.CATransport.handleEvent
(CATransport.java:350)
    at
com.cosylab.epics.caj.impl.reactor.lf.LeaderFollowersHandler.handleEvent
(LeaderFollowersHandler.java:77)
    at com.cosylab.epics.caj.impl.reactor.Reactor.processInternal
(Reactor.java:400)
    at com.cosylab.epics.caj.impl.reactor.Reactor.process(Reactor.java:284)
    at com.cosylab.epics.caj.impl.reactor.lf.LeaderFollowersHandler.run
(LeaderFollowersHandler.java:91)
    at java.util.concurrent.ThreadPoolExecutor.runWorker
(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run
(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:636)

I first checked the JavaDoc of PVManager on how to connect a PV and did exactly that:

	this.pv = PVManager.readAndWrite(channel(pvname)).notifyOn(swtThread
()).asyncWriteAndReadEvery(ms(pvUpdateInterval));

The exception occured in the pvChanged() method:

	Object newVal = pv.getValue();
	Exception e = pv.lastException();
	if (e != null) {
		logger.warn(pvName + ": " + e.getMessage(), e);
	}

Afterwards I downloaded the products NSLS-II 3.1.6 and SNS 3.1.4 (both Linux 32 bit). There I used the PVTable and added the PV that has the above mentioned problems.
One of them just has the PV colored red, the other showed the error above and afterwards something like not connected, trying again in 5 sec ? (don't know which of them did what anymore).

A cainfo of the PVs involved gives:

    State:         connected
    Host:          ***********
    Access:        read, no write
    Data type:     DBR_SHORT (native: DBF_SHORT)
    Element count: 1

PVs of type short with access read and write have the same problem.
! Note that the same behaviour occurs for Double/Float pairs...

One possible (and planned) solution is to upgrade to CSS 3.2 with PVManager
2 API, but maybe there is another solution ?

Thanks
Marcus Michalsky

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System