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onDataChange at Kepware OPC UA Server issue
October 19, 2021
11:56, EEST
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Oleksandr
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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)

October 19, 2021
12:44, EEST
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Jouni Aro
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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.

October 20, 2021
18:50, EEST
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Oleksandr
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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?

October 21, 2021
10:29, EEST
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Jouni Aro
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This is the method that is calling your listener. It’s actually in MonitoredDataItem:

protected void fireDataChange(DataValue prevValue, DataValue newValue) {
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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