sijie opened a new issue, #5350:
URL: https://github.com/apache/pulsar/issues/5350
**Describe the bug**
Pulsar couldn't find deployed SerDe class. But it exists in my fat jar
```
12:59:00.903 [t1/n1/JournalBatchParseFunction-0] ERROR
org.apache.pulsar.functions.instance.JavaInstanceRunnable -
[t1/n1/JournalBatchParseFunction: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-2.4.1.jar:2.4.1]
at
org.apache.pulsar.functions.instance.InstanceUtils.createInstance(InstanceUtils.java:84)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:?]
at
org.apache.pulsar.functions.instance.InstanceUtils.initializeSerDe(InstanceUtils.java:43)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:?]
at
org.apache.pulsar.functions.source.TopicSchema.newSchemaInstance(TopicSchema.java:197)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:2.4.1]
at
org.apache.pulsar.functions.source.TopicSchema.lambda$getSchema$0(TopicSchema.java:66)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:2.4.1]
at java.util.HashMap.computeIfAbsent(HashMap.java:1127)
~[?:1.8.0_212]
at
org.apache.pulsar.functions.source.TopicSchema.getSchema(TopicSchema.java:66)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:2.4.1]
at
org.apache.pulsar.functions.sink.PulsarSink.initializeSchema(PulsarSink.java:330)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:2.4.1]
at
org.apache.pulsar.functions.sink.PulsarSink.open(PulsarSink.java:255)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:2.4.1]
at
org.apache.pulsar.functions.instance.JavaInstanceRunnable.setupOutput(JavaInstanceRunnable.java:769)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:?]
at
org.apache.pulsar.functions.instance.JavaInstanceRunnable.setupJavaInstance(JavaInstanceRunnable.java:203)
~[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:?]
at
org.apache.pulsar.functions.instance.JavaInstanceRunnable.run(JavaInstanceRunnable.java:234)
[org.apache.pulsar-pulsar-functions-instance-2.4.1.jar:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.ClassNotFoundException:
ru.alfabank.api.utils.JournalBatchSerde
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
~[?:1.8.0_212]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
~[?:1.8.0_212]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
~[?:1.8.0_212]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_212]
at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_212]
at
org.apache.pulsar.functions.utils.Reflections.createInstance(Reflections.java:65)
~[org.apache.pulsar-pulsar-functions-utils-2.4.1.jar:2.4.1]
... 12 more
```
The command used to submit the function
```
bin/pulsar-admin --admin-url http://corpint4:6680 functions create
--retain-ordering --jar
http://binary/artifactory/libs-release-local/ru/alfabank/api/utils/pulsar-util-function-api-pack/0.10.2/pulsar-util-function-api-pack-0.10.2-all.jar
--classname ru.alfabank.api.utils.JournalBatchParseFunction --inputs
persistent://t1/n1/queue_1 --output persistent://t1/n1/queue_journal
--output-serde-classname ru.alfabank.api.utils.JournalBatchSerde --tenant t1
--namespace n1
```
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