[GitHub] [pulsar] leizhiyuan commented on issue #16827: java.lang.NoClassDefFoundError: org/apache/pulsar/shade/io/netty/buffer/PoolArena$1

[GitBox <gi...@apache.org>]

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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