vlemaitre commented on issue #5350: Pulsar can't load the customized SerDe URL: https://github.com/apache/pulsar/issues/5350#issuecomment-591467493 Hello, I face the same issue on 2.5.0 version. My Serde classes are into the jar file but the classes are not found when the function starts. This issue is still present in 2.5.0. Error logs : 14:52:24.290 [main] INFO org.apache.pulsar.functions.LocalRunner - RuntimeSpawner quit because of java.lang.RuntimeException: User class must be in class path at org.apache.pulsar.functions.utils.Reflections.createInstance(Reflections.java:67) ~[org.apache.pulsar-pulsar-functions-utils-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.instance.InstanceUtils.createInstance(InstanceUtils.java:84) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.instance.InstanceUtils.initializeSerDe(InstanceUtils.java:43) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.source.TopicSchema.newSchemaInstance(TopicSchema.java:202) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.source.TopicSchema.newSchemaInstance(TopicSchema.java:210) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.source.TopicSchema.lambda$getSchema$0(TopicSchema.java:66) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at java.util.HashMap.computeIfAbsent(HashMap.java:1127) ~[?:1.8.0_232] at org.apache.pulsar.functions.source.TopicSchema.getSchema(TopicSchema.java:66) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.source.PulsarSource.lambda$setupConsumerConfigs$5(PulsarSource.java:163) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at java.util.TreeMap.forEach(TreeMap.java:1005) ~[?:1.8.0_232] at org.apache.pulsar.functions.source.PulsarSource.setupConsumerConfigs(PulsarSource.java:160) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.source.PulsarSource.open(PulsarSource.java:66) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.instance.JavaInstanceRunnable.setupInput(JavaInstanceRunnable.java:732) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.instance.JavaInstanceRunnable.setupJavaInstance(JavaInstanceRunnable.java:215) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at org.apache.pulsar.functions.instance.JavaInstanceRunnable.run(JavaInstanceRunnable.java:244) ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0] at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_232] Caused by: java.lang.ClassNotFoundException: com.hardisgroup.n1.poc.ExampleCreationSerde at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_232] at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_232] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) ~[?:1.8.0_232] at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_232] at java.lang.Class.forName0(Native Method) ~[?:1.8.0_232] at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_232] at org.apache.pulsar.functions.utils.Reflections.createInstance(Reflections.java:65) ~[org.apache.pulsar-pulsar-functions-utils-2.5.0.jar:2.5.0] ... 15 more
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