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ArrayIndexOutOfBoundsException in UaClient.readValues(NodeId[])
February 2, 2017
14:59, EET
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clemens.boehler
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Hi everyone,

a customer of our company is getting an ArrayIndexOutOfBoundsException (see stacktrace below) when more than 1000 NodeIds are read at once. A Siemens SIMATIC S7-1500 OPC UA server is used.

java.lang.ArrayIndexOutOfBoundsException: 0
at com.prosysopc.ua.client.UaClient.read(Unknown Source) ~[Prosys-OPC-UA-Java-SDK-Client-Server-Binary-2.2.2.638.jar:2.2.2.638]
at com.prosysopc.ua.client.UaClient.readValues(Unknown Source) ~[Prosys-OPC-UA-Java-SDK-Client-Server-Binary-2.2.2.638.jar:2.2.2.638]
at com.prosysopc.ua.client.UaClient.readValues(Unknown Source) ~[Prosys-OPC-UA-Java-SDK-Client-Server-Binary-2.2.2.638.jar:2.2.2.638]
at com.prosysopc.ua.client.UaClient.readValues(Unknown Source) ~[Prosys-OPC-UA-Java-SDK-Client-Server-Binary-2.2.2.638.jar:2.2.2.638]
at com.prosysopc.ua.client.UaClient.readValues(Unknown Source) ~[Prosys-OPC-UA-Java-SDK-Client-Server-Binary-2.2.2.638.jar:2.2.2.638]

Is there a maximum array size that has to be checked before calling the readValues() method (I didn’t find anything in the Javadoc) or is this maybe a bug in the UA Client framework? Did anyone else face the same problem?

Thanks in advance and best regards,
Clemens

February 2, 2017
15:52, EET
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Heikki Tahvanainen
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Hello,

Thank you for reporting this. The exception probably happens when the server sends DiagnosticInfo array as size 0 instead of null. This situation should be handled more robustly in the client.

I’ll send you a corrected version of the SDK for testing in a moment.

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