无法使用激活器加载本机库(Play框架) [英] fail to load a native library using activator (Play Framework)

问题描述

我正在尝试在Play 2.4.x应用程序中加载本机库.我编写了一个简单的测试，该测试在IDE(IntelliJ)和SBT中都可以正常工作.在这两种情况下，我都设置java.library.path来运行测试.

I'm trying to load a native library in my Play 2.4.x application. I have written a simple test that works fine both in the IDE (IntelliJ) and in SBT. In both case I'm setting the java.library.path to get the tests to run.

在IDE中，我在测试运行配置中设置了-Djava.library.path=$USER_HOME$/dev/lindoapi/bin/linux64.

In the IDE, I set -Djava.library.path=$USER_HOME$/dev/lindoapi/bin/linux64 in the test run configuration.

根据sbt文档，我的build.sbt正在派生JVM并设置java.library.path.

As per the sbt documentation, my build.sbt is forking the JVM and setting the java.library.path.

javaOptions += "-Djava.library.path=/home/aczerwon/dev/lindoapi/bin/linux64"

fork := true

以下测试在IDE和activator test中都可以顺利通过.

The following test passes just fine in both the IDE and from activator test.

class LindoApiSpec extends Specification {

  System.loadLibrary("lindojni")

  "The Lindo API" should {

    "have a valid license" in {
      val lindo = new LindoEnvironment()
      lindo.apiVerion() must beSuccessfulTry.withValue("LINDO API Version 9.0.2120.225")
    }

}

在测试环境之外，我会在Play的启动生命周期中加载本机库.

When outside of the testing context, I load the native library in Play's startup lifecycle.

object Global extends GlobalSettings {

  override def beforeStart(app: Application) = {
    System.loadLibrary("lindojni")
  }

}

当我从webapi(activator ~run)调用相同的方法时，出现了UnsatisfiedLinkError错误.

When I call that same method from the webapi (activator ~run), I'm getting an UnsatisfiedLinkError error.

1) Error injecting constructor, java.lang.UnsatisfiedLinkError: no lindojni in java.library.path
  at play.api.GlobalPlugin.<init>(GlobalSettings.scala:262)
  at play.api.GlobalPlugin.class(GlobalSettings.scala:262)
  while locating play.api.GlobalPlugin

网络api看起来像这样:

The web api looks like this:

class OptimizationApi extends Controller {

  def version() = Action {
    val lindo = new LindoEnvironment()
    lindo.apiVerion() match {
      case Success(version) => Ok(version)
      case Failure(e) => BadRequest(e.getMessage)
    }
  }

}

我假设我的build.sbt将派生JVM，并为两者 test 和 run上下文设置java.library.path.关于我在做什么错的任何线索吗?

I assumed that my build.sbt would fork the JVM and set the java.library.path for both test and run contexts. Any clues as to what I'm doing wrong?

新信息

当我启动activator -Djava.library.path=$USER_HOME$/dev/lindoapi/bin/linux64或设置JAVA_OPTS时，启动生命周期中对System.loadLibrary(...)的调用将通过.我仍然得到UnsatisfiedLinkError，但是稍后通过JNI调用本机库时会发生.很奇怪.

When I start activator -Djava.library.path=$USER_HOME$/dev/lindoapi/bin/linux64 or set JAVA_OPTS, the call to System.loadLibrary(...) in the startup lifecycle passes. I still get the UnsatisfiedLinkError, but it happens later when I make a call to the native library via JNI. Very strange.

推荐答案

我找到了解决问题的方法此处.

I found a solution to the issue here.

本机库及其Java对应库必须位于同一类加载器中.

The native library and its java counterpart must be in the same class loader.

创建一个类似于以下内容的类:

Create a class similar to:

public final class PlayNativeLibraryLoader {
    public static void load(String libraryPath) {
        System.load(libraryPath);
    }
}

现在您可以在Play启动生命周期中使用它.

And now you can use it in the Play startup lifecycle.

object Global extends GlobalSettings {

  override def beforeStart(app: Application) = {
    PlayNativeLibraryLoader.load(app.getFile("./lib/lindoapi/linux64/liblindojni.so").getPath)
    Logger.info("Lindo native library loaded")
  }

}

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