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ConcurrentModificationException at
December 14, 2021
16:49, EET
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rocket science
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Hi,

I got a ConcurrentModificationException during following call:

UaClient client = new UaClient(serverUri);

—-
Caused by: java.util.ConcurrentModificationException
at java.util.Hashtable$Enumerator.next(Hashtable.java:1387) ~[?:1.8.0_181]
at com.prosysopc.ua.UaApplication.<clinit>(SourceFile:158) ~[prosys-opc-ua-sdk-client-4.6.2-1636.jar:?]

It happened for the first time, and I was not able to reproduce it. But maybe you can take a look at this what happend and which Hashtable was modified here during the enumeration.

Thanks!

December 14, 2021
17:28, EET
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Bjarne Boström
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Hi,

Do you have DEBUG level logging on for com.prosysopc.ua.UaApplication (or the package etc.)? If on DEBUG it would output System.getProperties() in a for loop and if they would be modified at the same time from another thread this could have happened. The iterator for EntrySet of the Properties would be a HashTable based Set apparently, so I assume this is what happened. Though.. not a scenario I would expect to happen likely, but I’ll add a note in our issue tracker so this can maybe be addressed in the future.

December 14, 2021
17:38, EET
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rocket science
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Hi Bjarne,
thanks for taking care of this in your ussue tracker, and yes, I had DEBUG log level configured.

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