Antti-Kaikkonen commented on issue #5350: Pulsar can't load the customized SerDe
URL: https://github.com/apache/pulsar/issues/5350#issuecomment-590038153
 
 
   @sijie @wolfstudy 
   I'm getting the same error when using --custom-serde-inputs:
   ```
   ./pulsar-admin functions create --jar 
test-functions/PulsarPOJOFunction-1.0-SNAPSHOT-jar-with-dependencies.jar 
--classname com.example.pulsartest.PojoFunction --name pojo-function --inputs 
user --output user2 --custom-serde-inputs 
"{"user":"com.example.pulsartest.UserSerDe"}"
   ```
   Error found in logs:
   ```
   09:48:40.471 [public/default/pojo-function-0] ERROR 
org.apache.pulsar.functions.instance.JavaInstanceRunnable - 
[public/default/pojo-function8:0] Uncaught exception in Java Instance
   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$0(TopicSchema.java:66)
 ~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0]
           at java.util.HashMap.computeIfAbsent(HashMap.java:1133) ~[?:?]
           at 
org.apache.pulsar.functions.source.TopicSchema.getSchema(TopicSchema.java:66) 
~[org.apache.pulsar-pulsar-functions-instance-2.5.0.jar:2.5.0]
           at 
org.apache.pulsar.functions.source.PulsarSource.lambda$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:1002) ~[?:?]
           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:834) ~[?:?]
   Caused by: java.lang.ClassNotFoundException: com.example.pulsartest.UserSerDe
           at java.net.URLClassLoader.findClass(URLClassLoader.java:471) ~[?:?]
           at java.lang.ClassLoader.loadClass(ClassLoader.java:588) ~[?:?]
           at java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[?:?]
           at java.lang.Class.forName0(Native Method) ~[?:?]
           at java.lang.Class.forName(Class.java:398) ~[?:?]
           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
   ```
   But com.example.pulsartest.UserSerDe exists in my jar. Pulsar is is 2.5.0 
standalone.

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