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https://issues.apache.org/jira/browse/PLC4X-291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ben Hutcheson resolved PLC4X-291.
---------------------------------
Resolution: Fixed
> DefaultPlcSubscriptionField cannot be cast to class OpcuaField
> ---------------------------------------------------------------
>
> Key: PLC4X-291
> URL: https://issues.apache.org/jira/browse/PLC4X-291
> Project: Apache PLC4X
> Issue Type: Bug
> Components: API
> Affects Versions: 0.8.0
> Reporter: Souquières Adam
> Priority: Major
> Fix For: 0.9.0
>
>
> {code:java}
> @Test
> public void shoudlWorkWithSubscriptionRequest() throws
> PlcConnectionException, InterruptedException {
> var plcConnection = new
> PlcDriverManager().getConnection("opcua:tcp://localhost:62541/Quickstarts/ReferenceServer")
>
> // Connection OK : lets subscribe
> var subBuilder = plcConnection.subscriptionRequestBuilder();
> subBuilder.addChangeOfStateField("machine1",
> "ns=2;s=Fabrication_Id_1:STRING");
> var subscriptionRequest = subBuilder.build();
> var subResponse = subscriptionRequest.execute();
> subResponse.whenComplete(
> (response, ex) -> {
> System.out.println("Result : "+ response + " - "+ex);
>
> for (String subscriptionName : response.getFieldNames()) {
> final var subscriptionHandle =
> response.getSubscriptionHandle(subscriptionName);
> subscriptionHandle.register(System.out::println);
> }
> });
>
> Thread.sleep(1000000000);
> }
> {code}
> The code above always return this specific exception in the whenComplete
> callback:
> {code:java}
> java.lang.ClassCastException: class
> org.apache.plc4x.java.spi.model.DefaultPlcSubscriptionField cannot be cast to
> class org.apache.plc4x.java.opcua.protocol.OpcuaField
> (org.apache.plc4x.java.spi.model.DefaultPlcSubscriptionField and
> org.apache.plc4x.java.opcua.protocol.OpcuaField are in unnamed module of
> loader 'app')
> {code}
>
> Dependencies used in this maven project are :
> {code:xml}
> <dependency> <groupId>org.apache.plc4x</groupId>
> <artifactId>plc4j-api</artifactId> <version>0.8.0</version> </dependency>
> <dependency> <groupId>org.apache.plc4x</groupId>
> <artifactId>plc4j-driver-opcua</artifactId> <version>0.8.0</version>
> <scope>runtime</scope> </dependency>
> {code}
>
> Diagnosis :
> It appears that DefaultPlcSubscriptionField is composed of a
> PlcField/OpcuaField on api side, but expected as an direct OpcuaField on
> driver side.
> I do not have the general knowledge of the design of this repository so i'm
> not confident enough to propose you a pull request.
> Fix proposal :
> -> Add already existing getField from DefaultPlcSubscriptionField in
> PlcSubscriptionField interface and assume the composition strategy for
> PlcSubscriptionField + Modify OpcuaTcpPlcConnection to get real field from
> this new method ( may have an impact on other driver implementation too !)
> I stay available to give you some more information.
>
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