着色后io.netty tcnative停止工作

Question

由于依赖关系中的冲突，我想为io.netty添加阴影。着色后，本机ssl库（netty-tcnative-boringssl-static）的加载将停止工作。

主pom

...
<dependency>
    <groupId>com.example.myapp</groupId>
    <artifactId>pubsub-library<artifactId>
    <version>1.0</version>
</dependency>
...

...
<dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-pubsub</artifactId>
    <version>0.24.0-beta</version>
<dependency>
...
<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-shade-plugin</artifactId>
  <version>3.1.0</version>
  <executions>
      <execution>
          <phase>package</phase>
          <goals>
              <goal>shade</goal>
          </goals>
          <configuration>
              <relocations>
                  <relocation>
                      <pattern>io.netty</pattern>
                          <shadedPattern>com.example.myapp.shaded.io.netty</shadedPattern>
                  </relocation>
              </relocations>
           </configuration>
       </execution>
   </executions>
</plugin>
...

pubsub有以下3个依赖项:io.netty:nettycodec-http2:jar:4.1.14.final、io.netty:netty-handler-proxy:jar:4.1.14.final和io.netty:netty-tcnative-boringssl-static:jar:2.0.3.final

错误

当io.netty.util.internal.NativeLibraryLoader尝试加载本机库时会出现问题。它给我的错误如下：

17:44:48.230 [main] DEBUG com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader - -Dio.netty.tmpdir: /var/folders/ll/wy1vgf8945l_87mpfc9ylb94fglr7d/T (java.io.tmpdir)
17:44:48.230 [main] DEBUG com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader - -Dio.netty.native.workdir: /var/folders/ll/wy1vgf8945l_87mpfc9ylb94fglr7d/T (io.netty.tmpdir)
17:44:48.241 [main] DEBUG com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader - Unable to load the library 'com.example.myapp-shaded-netty-tcnative-osx-x86_64', trying other loading mechanism.
java.lang.UnsatisfiedLinkError: no com.example.myapp-shaded-netty-tcnative-osx-x86_64 in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
    at java.lang.Runtime.loadLibrary0(Runtime.java:870)
    at java.lang.System.loadLibrary(System.java:1122)
    at com.example.myapp.shaded.io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:38)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader$1.run(NativeLibraryLoader.java:311)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader.loadLibraryByHelper(NativeLibraryLoader.java:303)
    at com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:291)
    at com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.java:224)
    at com.example.myapp.shaded.io.netty.util.internal.NativeLibraryLoader.loadFirstAvailable(NativeLibraryLoader.java:172)
    at com.example.myapp.shaded.io.netty.handler.ssl.OpenSsl.loadTcNative(OpenSsl.java:423)
    at com.example.myapp.shaded.io.netty.handler.ssl.OpenSsl.<clinit>(OpenSsl.java:91)
    at com.example.myapp.job.audit.GoogleCloudCompatChecker.check(GoogleCloudCompatChecker.java:30)
    at com.example.myapp.job.audit.AuditJobMain.main(AuditJobMain.java:8)

我已经查看了主POM生成的jar内部。并且没有与该名称匹配的本机库。这是在meta-inf/native目录中：

libnetty-tcnative-linux-x86_64.so
libnetty-tcnative-osx-x86_64.jnilib
libnetty-transport-native-epoll.so
linux32
linux64
netty-tcnative-windows-x86_64.dll
osx
windows32
windows64

我做错了什么？我如何在不破坏TCnative的情况下遮蔽IO.Netty。

Answer 1

看看NativeLibraryLoader源代码。

这可能与您正在使用的版本不同，但它表明它使用了很少的启发式来查找本机库，并且最可行的是，这些启发式在shade上失败，但可能很容易修复

仔细研究代码，可能重写/调试/日志记录NativeLibraryLoader。

您是否被迫使用某些依赖库的两个版本，从而不能仅仅使用maven排除？