Delostik opened a new issue #7995:
URL: https://github.com/apache/pulsar/issues/7995
**Describe the bug**
I use brpc(a rpc framework) with netty 4.1.16.Final to create epoll event
loop, but see following error:
```
Exception in thread "Thread-bat2-test" java.lang.UnsatisfiedLinkError:
failed to load the required native library
at io.netty.channel.epoll.Epoll.ensureAvailability(Epoll.java:81)
at
io.netty.channel.epoll.EpollEventLoop.<clinit>(EpollEventLoop.java:55)
at
io.netty.channel.epoll.EpollEventLoopGroup.newChild(EpollEventLoopGroup.java:134)
at
io.netty.channel.epoll.EpollEventLoopGroup.newChild(EpollEventLoopGroup.java:35)
at
io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
at
io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58)
at
io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:47)
at
io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59)
at
io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:104)
at
io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:91)
at
io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:68)
at
com.baidu.brpc.thread.BrpcThreadPoolManager.createClientIoThreadPool(BrpcThreadPoolManager.java:75)
at
com.baidu.brpc.thread.BrpcThreadPoolManager.getOrCreateClientIoThreadPool(BrpcThreadPoolManager.java:50)
at
com.baidu.brpc.client.channel.BootstrapManager.createBooStrap(BootstrapManager.java:94)
at
com.baidu.brpc.client.channel.BootstrapManager.getOrCreateBootstrap(BootstrapManager.java:48)
at
com.baidu.brpc.client.channel.AbstractBrpcChannel.<init>(AbstractBrpcChannel.java:40)
at
com.baidu.brpc.client.channel.BrpcSingleChannel.<init>(BrpcSingleChannel.java:83)
at
com.baidu.brpc.client.channel.BrpcChannelFactory.createChannel(BrpcChannelFactory.java:12)
at
com.baidu.brpc.client.CommunicationClient.<init>(CommunicationClient.java:67)
at
com.baidu.brpc.client.InterceptCommunicationClient.<init>(InterceptCommunicationClient.java:22)
at
com.baidu.brpc.naming.NamingServiceProcessor.addInstance(NamingServiceProcessor.java:112)
at
com.baidu.brpc.naming.NamingServiceProcessor.addInstances(NamingServiceProcessor.java:102)
at
com.baidu.brpc.naming.NamingServiceProcessor.<init>(NamingServiceProcessor.java:59)
at
com.baidu.brpc.client.RpcClient.setServiceInterface(RpcClient.java:155)
at com.baidu.brpc.client.BrpcProxy.getProxy(BrpcProxy.java:130)
at com.baidu.brpc.client.BrpcProxy.getProxy(BrpcProxy.java:126)
at com.test-project.ProxyClient.<init>(ProxyClient.java:49)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class
io.netty.channel.epoll.Native
at io.netty.channel.epoll.Epoll.<clinit>(Epoll.java:33)
... 34 more
```
It seems that the shaded package was loaded but cannot load native library.
And I unpackage the jar
```
root@mytestenv:~# ldd --version
ldd (Ubuntu GLIBC 2.23-0ubuntu11) 2.23
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
root@mytestenv:~# ldd
./META-INF/native/libnetty_transport_native_epoll_x86_64.so
linux-vdso.so.1 => (0x00007ffddd186000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f7b59749000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7b5937f000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007f7b59162000)
/lib64/ld-linux-x86-64.so.2 (0x00007f7b59b5f000)
```
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