leizhiyuan commented on issue #16827:
URL: https://github.com/apache/pulsar/issues/16827#issuecomment-1209211578
It maybe an issue of flink classloader
```
Caused by: java.lang.ClassNotFoundException:
org.apache.pulsar.shade.io.netty.buffer.PoolArena$1
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at
org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$ChildFirstClassLoader.loadClass(FlinkUserCodeClassLoaders.java:129)
```
if you can debug this , you can print
org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$ChildFirstClassLoader
```
.loadClass("org.apache.pulsar.shade.io.netty.buffer.PoolArena").getProtectionDomain().getCodeSource().getLocation()
```
to see which one is loaded by this classloader , and see the original jar
file.
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