sbt 程序集 fat JAR 的 Bigtable 错误（Jetty ALPN 和 OpenSSL 都不可用）

Question

我想用 akka-http 构建一个 Restful API，能够从 Bigtable (HBase) 检索数据。

Bigtable 客户端 API 需要 netty-tcnative-boringssl-static 才能连接。这在我的 Intellij IDE 中运行良好，但是当我使用 sbt-assembly 构建一个胖 JAR，然后运行服务器时，我收到以下错误：

2017-01-10 12:03:41 ERROR BigtableSession:129 - Neither Jetty ALPN nor OpenSSL are available. OpenSSL unavailability cause:
java.lang.IllegalArgumentException: Failed to load any of the given libraries: [netty-tcnative-linux-x86_64, netty-tcnative-linux-x86_64-fedora, netty-tcnative]
Exception in thread "main" java.lang.ExceptionInInitializerError
        at mycompany.algo.serving.model.algoServingModelLoaderTest$.loadLastModel(algoServingModelLoaderTest.scala:36)
        at mycompany.algo.serving.algoServingLauncherTest$$anonfun$4.apply(algoServingLauncherTest.scala:38)
        at mycompany.algo.serving.algoServingLauncherTest$$anonfun$4.apply(algoServingLauncherTest.scala:38)
        at mycompany.serving.MultiPredictorEbapServing$$anonfun$loadPredictors$1.apply(MultiPredictorEbapServing.scala:25)
        at mycompany.serving.MultiPredictorEbapServing$$anonfun$loadPredictors$1.apply(MultiPredictorEbapServing.scala:25)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at mycompany.serving.MultiPredictorEbapServing.loadPredictors(MultiPredictorEbapServing.scala:25)
        at mycompany.algo.serving.algoServingLauncherTest$.delayedEndpoint$mycompany$algo$serving$algoServingLauncherTest$1(algoServingLauncherTest.scala:38)
        at mycompany.algo.serving.algoServingLauncherTest$delayedInit$body.apply(algoServingLauncherTest.scala:11)
        at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
        at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.App$$anonfun$main$1.apply(App.scala:76)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
        at scala.App$class.main(App.scala:76)
        at mycompany.algo.serving.algoServingLauncherTest$.main(algoServingLauncherTest.scala:11)
        at mycompany.algo.serving.algoServingLauncherTest.main(algoServingLauncherTest.scala)
Caused by: java.lang.IllegalgotateException: Could not find an appropriate constructor for com.google.cloud.bigtable.hbase1_2.BigtableConnection
        at com.google.cloud.bigtable.hbase.BigtableConfiguration.connect(BigtableConfiguration.java:88)
        at com.google.cloud.bigtable.hbase.BigtableConfiguration.connect(BigtableConfiguration.java:72)
        at mycompany.algo.serving.model.algoServingModel$.<init>(algoServingModel.scala:25)
        at mycompany.algo.serving.model.algoServingModel$.<clinit>(algoServingModel.scala)
        ... 18 more
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
        at com.google.cloud.bigtable.hbase.BigtableConfiguration.connect(BigtableConfiguration.java:85)
        ... 21 more
Caused by: java.lang.IllegalgotateException: Neither Jetty ALPN nor OpenSSL via netty-tcnative were properly configured.
        at com.google.cloud.bigtable.grpc.BigtableSession.<init>(BigtableSession.java:279)
        at org.apache.hadoop.hbase.client.AbstractBigtableConnection.<init>(AbstractBigtableConnection.java:137)
        at org.apache.hadoop.hbase.client.AbstractBigtableConnection.<init>(AbstractBigtableConnection.java:104)
        at com.google.cloud.bigtable.hbase1_2.BigtableConnection.<init>(BigtableConnection.java:50)
        ... 26 more

我该怎么办？

我正在使用 Scala 2.11.8，我的 sbt 看起来像：

dependencies ++= Seq(
  "com.google.cloud" % "google-cloud" % "0.7.0",
  "com.google.cloud.bigtable" % "bigtable-hbase-1.2" % "0.9.4",
  "io.netty" % "netty-tcnative-boringssl-static" % "1.1.33.Fork19",
  "org.apache.hbase" % "hbase-server" % "1.2.1",
  "org.apache.hbase" % "hbase-client" % "1.2.1",
  "org.apache.hbase" % "hbase-common" % "1.2.1",
)

感谢您的帮助

编辑编辑，因为我最初虽然它是由 akka 引起的，但可以在没有 Akka 的情况下重现它

编辑我的错，原生库被我的 sbt 程序集合并策略驱逐了

编辑这适用于 Maven，问题似乎出在 sbt

解决方案 这是由 sbt-assembly 默认合并策略引起的。 我需要添加以下设置

val settings = Seq(
    assemblyMergeStrategy in assembly := {
      case PathList("META-INF", xs @ _*) =>
        xs map {_.toLowerCase} match {
          case "native" :: xs =>
            MergeStrategy.singleOrError
          case _ => MergeStrategy.discard
        }
      case "reference.conf" => MergeStrategy.concat
      case x => MergeStrategy.first
    }
)

Answer 1

问题出在SBT合并策略上，我用这个策略解决了这个问题。

assemblyMergeStrategy in assembly := {
  case PathList("META-INF", "MANIFEST.MF") => MergeStrategy.discard
  case _ => MergeStrategy.first
}