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11:56, EEST
February 14, 2020
Offline
Hello,
can you give an indication of what could be the cause of the error?
The error also occurs after the network failure in the case of a date change event when the value changes from “null” to any. The other changes did not fail.
Thank you in advance.
14-10-2021 14:33:42.718 [ERROR] com.prosysopc.ua.dient.Monitoredltem:417 – Exception while calling onDataChange with listener=com.itac.plcconnectorV2.opcua.dient.DataItemListener@112c93de j ava.lang.NullPointerException
at com.itac.plcconnectorV2.opcua.dient.OpcUaClient.nodeChanged(OpcUaClient.java:557)
at com.itac.plcconnectorV2.opcua.dient.DataltemListener.onDataChange(DataltemListener.java:26)
at com.prosysopc.ua.dient.MonitoredDataltem.fireDataChange(SourceFile:415)
at com.prosysopc.ua.dient.MonitoredDataltem.setValue(SourceFile:443)
at com.prosysopc.ua.dient.Subscription.a(SourceFile:1361)
at com.prosysopc.ua.dient.Subscription.handleNotificationDatas(SourceFile:1925) at com.prosysopc.ua.dient.UaClientSa.aF(SourceFile:362) at com.prosysopc.ua.dient.UaClientSa.run(SourceFile:248) at java.lang.Thread.run(Thread.java:748)
14-10-2021 14:33:49.718 [ERROR] com.prosysopc.ua.dient.Monitoredltem:417 – Exception while calling onDataChange with listener=com.itac.plcconnectorV2.opcua.dient.DataItemListener@34c03c59 j ava.lang.NullPointerException
at com.itac.plcconnectorV2.opcua.dient.OpcUaClient.nodeChanged(OpcUaClient.java:557)
at com.itac.plcconnectorV2.opcua.dient.DataltemListener.onDataChange(DataltemListener.java:26)
at com.prosysopc.ua.dient.MonitoredDataltem.fireDataChange(SourceFile:415)
at com.prosysopc.ua.dient.MonitoredDataltem.setValue(SourceFile:443)
at com.prosysopc.ua.dient.Subscription.a(SourceFile:1361)
at com.prosysopc.ua.dient.Subscription.handleNotificationDatas(SourceFile:1925) at com.prosysopc.ua.dient.UaClientSa.aF(SourceFile:362) at com.prosysopc.ua.dient.UaClientSa.run(SourceFile:248) at java.lang.Thread.run(Thread.java:748)
12:44, EEST
December 21, 2011
Offline
Please, check your own event handler at
com.itac.plcconnectorV2.opcua.dient.OpcUaClient.nodeChanged(OpcUaClient.java:557)
Maybe it is not expecting any null values.
18:50, EEST
February 14, 2020
Offline
Thank you for your quick reply.
Our code is unfortunately quite outdated and no longer predictable.
That only happens with OPC UA Server KepwareEX 6.0 after reconect and not at the first connect.
And what is done in the line com.prosysopc.ua.dient.Monitoredltem: 417?
10:29, EEST
December 21, 2011
Offline
This is the method that is calling your listener. It’s actually in MonitoredDataItem:
if (dataChangeListener != null) {
try {
dataChangeListener.onDataChange(this, prevValue, newValue);
} catch (Exception e) {
logger.error("Exception while calling onDataChange with listener=" + dataChangeListener, e);
}
}
}
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