ClassCastException class org.apache.avro.Schema$RecordSchema cannot be cast to class io.confluent.kafka.schemaregistry.avro.AvroSchema

[rr-brian-hultin]

Hi,

When I try to Load Subject in the Value Schema Serializer Config I get this exception. I've tried several combinations of NameStrategies and Serializers and they all seem to produce the error. I'm able to get the list of subjects from the schema host, but can't proceed any further. I'm using JMeter 5.5 with Java 11 and KLG 5.6.6.

Thanks

2023-09-22 14:56:39,457 ERROR o.a.j.JMeter: Uncaught exception in thread Thread[AWT-EventQueue-0,6,main] java.lang.ClassCastException: class org.apache.avro.Schema$RecordSchema cannot be cast to class io.confluent.kafka.schemaregistry.avro.AvroSchema (org.apache.avro.Schema$RecordSchema and io.confluent.kafka.schemaregistry.avro.AvroSchema are in unnamed module of loader org.apache.jmeter.DynamicClassLoader @47fd17e3) at com.sngular.kloadgen.extractor.extractors.avro.AvroConfluentExtractor.processSchema(AvroConfluentExtractor.java:9) ~[kloadgen-5.6.6.jar:?] at com.sngular.kloadgen.extractor.extractors.avro.AvroExtractor.processSchema(AvroExtractor.java:20) ~[kloadgen-5.6.6.jar:?] at com.sngular.kloadgen.extractor.extractors.ExtractorFactory.flatPropertiesList(ExtractorFactory.java:90) ~[kloadgen-5.6.6.jar:?] at com.sngular.kloadgen.extractor.SchemaExtractor.flatPropertiesList(SchemaExtractor.java:33) ~[kloadgen-5.6.6.jar:?] at com.sngular.kloadgen.property.editor.SerialisedSubjectPropertyEditor.actionPerformed(SerialisedSubjectPropertyEditor.java:79) ~[kloadgen-5.6.6.jar:?] at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) ~[?:?] at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308) ~[?:?] at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405) ~[?:?] at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262) ~[?:?] at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279) ~[?:?] at com.github.weisj.darklaf.ui.button.DarkButtonListener.mouseReleased(DarkButtonListener.java:72) ~[darklaf-core-2.7.3.jar:2.7.3] at java.awt.Component.processMouseEvent(Component.java:6635) ~[?:?] at javax.swing.JComponent.processMouseEvent(JComponent.java:3342) ~[?:?] at java.awt.Component.processEvent(Component.java:6400) ~[?:?] at java.awt.Container.processEvent(Container.java:2263) ~[?:?] at java.awt.Component.dispatchEventImpl(Component.java:5011) ~[?:?] at java.awt.Container.dispatchEventImpl(Container.java:2321) ~[?:?] at java.awt.Component.dispatchEvent(Component.java:4843) ~[?:?] at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) ~[?:?] at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) ~[?:?] at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) ~[?:?] at java.awt.Container.dispatchEventImpl(Container.java:2307) ~[?:?] at java.awt.Window.dispatchEventImpl(Window.java:2772) ~[?:?] at java.awt.Component.dispatchEvent(Component.java:4843) ~[?:?] at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) ~[?:?] at java.awt.EventQueue$4.run(EventQueue.java:721) ~[?:?] at java.awt.EventQueue$4.run(EventQueue.java:715) ~[?:?] at java.security.AccessController.doPrivileged(Native Method) ~[?:?] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) ~[?:?] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) ~[?:?] at java.awt.EventQueue$5.run(EventQueue.java:745) ~[?:?] at java.awt.EventQueue$5.run(EventQueue.java:743) ~[?:?] at java.security.AccessController.doPrivileged(Native Method) ~[?:?] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) ~[?:?] at java.awt.EventQueue.dispatchEvent(EventQueue.java:742) ~[?:?] at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) ~[?:?] at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) ~[?:?] at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) ~[?:?] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) ~[?:?] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) ~[?:?] at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) ~[?:?]

[jemacineiras]

Hi @rr-brian-hultin,
Are you trying to connect to an Api Curio Schema Registry using the Confluent Configuration option in the Schema Registry Configuration Component?

It looks like just like that.

Please confirm you schema registry type.. Confluent or Apicurio.

Cheers

[hedes-gs]

Hello
same issue when using the Confluent Configuration
Regards