[jira] [Created] (PLC4X-290) java.lang.ClassCastException: DefaultPlcSubscriptionField cannot be cast to class OpcuaField

[Jira]

Souquières Adam created PLC4X-290:
-------------------------------------

             Summary: java.lang.ClassCastException: DefaultPlcSubscriptionField 
cannot be cast to class OpcuaField
                 Key: PLC4X-290
                 URL: https://issues.apache.org/jira/browse/PLC4X-290
             Project: Apache PLC4X
          Issue Type: Bug
          Components: API
    Affects Versions: 0.8.0
         Environment: Environment independent
            Reporter: Souquières Adam


{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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