"UnsatisfiedLinkError: Thư viện gốc đã được tải trong một trình nạp lớp khác" trong dự án đa cấp

Question

Tôi có một dự án sử dụng thư viện JOCL (http://www.jocl.org/) và có nhiều mô-đun. Khi tôi chạy "thử nghiệm ./activator" từ dòng lệnh, hoặc chạy 'thử nghiệm' lệnh trong SBT console tôi nhận được lỗi như sau:

[info] Exception encountered when attempting to run a suite with class name: pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec *** ABORTED *** 
[info] java.lang.UnsatisfiedLinkError: Error while loading native library "JOCL_0_1_9-linux-x86_64" with base name "JOCL_0_1_9" 
[info] Operating system name: Linux 
[info] Architecture   : amd64 
[info] Architecture bit size: 64 
[info] ---(start of nested stack traces)--- 
[info] Stack trace from the attempt to load the library as a file: 
[info] java.lang.UnsatisfiedLinkError: no JOCL_0_1_9-linux-x86_64 in java.library.path 
[info] at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1865) 
[info] at java.lang.Runtime.loadLibrary0(Runtime.java:870) 
[info] at java.lang.System.loadLibrary(System.java:1122) 
[info] at org.jocl.LibUtils.loadLibrary(LibUtils.java:80) 
[info] at org.jocl.CL.<clinit>(CL.java:47) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextDescription$.enumerate(CLContextDescription.scala:44) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.contextsDescriptions$lzycompute(CLContextsManager.scala:6) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.contextsDescriptions(CLContextsManager.scala:6) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.createCpuContext(CLContextsManager.scala:9) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.cpuContext$lzycompute(CLContextsCache.scala:24) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.cpuContext(CLContextsCache.scala:24) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.withCpuContext(CLContextsCache.scala:28) 
[info] at pl.tarsa.sortalgobox.opencl.common.CpuSort.sort(CpuSort.scala:34) 
[info] at pl.tarsa.sortalgobox.opencl.common.CpuSort.sort(CpuSort.scala:32) 
[info] at pl.tarsa.sortalgobox.sorts.SortChecker.forEmptyArray(SortChecker.scala:31) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(CpuMergeSortSpec.scala:32) 
[info] at pl.tarsa.sortalgobox.tests.CommonUnitSpecBase.guardedOpenCLTest(CommonUnitSpecBase.scala:40) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1.apply$mcV$sp(CpuMergeSortSpec.scala:31) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1.apply(CpuMergeSortSpec.scala:31) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1.apply(CpuMergeSortSpec.scala:31) 
[info] at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22) 
[info] at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85) 
[info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) 
[info] at org.scalatest.Transformer.apply(Transformer.scala:22) 
[info] at org.scalatest.Transformer.apply(Transformer.scala:20) 
[info] at org.scalatest.FlatSpecLike$$anon$1.apply(FlatSpecLike.scala:1647) 
[info] at org.scalamock.scalatest.AbstractMockFactory$$anonfun$withFixture$1.apply(AbstractMockFactory.scala:35) 
[info] at org.scalamock.scalatest.AbstractMockFactory$$anonfun$withFixture$1.apply(AbstractMockFactory.scala:34) 
[info] at org.scalamock.MockFactoryBase$class.withExpectations(MockFactoryBase.scala:41) 
[info] at pl.tarsa.sortalgobox.tests.CommonUnitSpecBase.withExpectations(CommonUnitSpecBase.scala:28) 
[info] at org.scalamock.scalatest.AbstractMockFactory$class.withFixture(AbstractMockFactory.scala:34) 
[info] at pl.tarsa.sortalgobox.tests.CommonUnitSpecBase.withFixture(CommonUnitSpecBase.scala:28) 
[info] at org.scalatest.FlatSpecLike$class.invokeWithFixture$1(FlatSpecLike.scala:1644) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTest$1.apply(FlatSpecLike.scala:1656) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTest$1.apply(FlatSpecLike.scala:1656) 
[info] at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306) 
[info] at org.scalatest.FlatSpecLike$class.runTest(FlatSpecLike.scala:1656) 
[info] at org.scalatest.FlatSpec.runTest(FlatSpec.scala:1683) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTests$1.apply(FlatSpecLike.scala:1714) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTests$1.apply(FlatSpecLike.scala:1714) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401) 
[info] at scala.collection.immutable.List.foreach(List.scala:381) 
[info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401) 
[info] at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:390) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:427) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401) 
[info] at scala.collection.immutable.List.foreach(List.scala:381) 
[info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401) 
[info] at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396) 
[info] at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483) 
[info] at org.scalatest.FlatSpecLike$class.runTests(FlatSpecLike.scala:1714) 
[info] at org.scalatest.FlatSpec.runTests(FlatSpec.scala:1683) 
[info] at org.scalatest.Suite$class.run(Suite.scala:1424) 
[info] at org.scalatest.FlatSpec.org$scalatest$FlatSpecLike$$super$run(FlatSpec.scala:1683) 
[info] at org.scalatest.FlatSpecLike$$anonfun$run$1.apply(FlatSpecLike.scala:1760) 
[info] at org.scalatest.FlatSpecLike$$anonfun$run$1.apply(FlatSpecLike.scala:1760) 
[info] at org.scalatest.SuperEngine.runImpl(Engine.scala:545) 
[info] at org.scalatest.FlatSpecLike$class.run(FlatSpecLike.scala:1760) 
[info] at org.scalatest.FlatSpec.run(FlatSpec.scala:1683) 
[info] at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:462) 
[info] at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:671) 
[info] at sbt.TestRunner.runTest$1(TestFramework.scala:76) 
[info] at sbt.TestRunner.run(TestFramework.scala:85) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202) 
[info] at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:185) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202) 
[info] at sbt.TestFunction.apply(TestFramework.scala:207) 
[info] at sbt.Tests$$anonfun$9.apply(Tests.scala:216) 
[info] at sbt.Tests$$anonfun$9.apply(Tests.scala:216) 
[info] at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:44) 
[info] at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:44) 
[info] at sbt.std.Transform$$anon$4.work(System.scala:63) 
[info] at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226) 
[info] at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226) 
[info] at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17) 
[info] at sbt.Execute.work(Execute.scala:235) 
[info] at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226) 
[info] at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226) 
[info] at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159) 
[info] at sbt.CompletionService$$anon$2.call(CompletionService.scala:28) 
[info] at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
[info] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[info] at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
[info] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[info] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[info] at java.lang.Thread.run(Thread.java:745) 
[info] Stack trace from the attempt to load the library as a resource: 
[info] java.lang.UnsatisfiedLinkError: Native Library /tmp/libJOCL_0_1_9-linux-x86_64.so already loaded in another classloader 
[info] at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1903) 
[info] at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1822) 
[info] at java.lang.Runtime.load0(Runtime.java:809) 
[info] at java.lang.System.load(System.java:1086) 
[info] at org.jocl.LibUtils.loadLibraryResource(LibUtils.java:188) 
[info] at org.jocl.LibUtils.loadLibrary(LibUtils.java:91) 
[info] at org.jocl.CL.<clinit>(CL.java:47) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextDescription$.enumerate(CLContextDescription.scala:44) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.contextsDescriptions$lzycompute(CLContextsManager.scala:6) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.contextsDescriptions(CLContextsManager.scala:6) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.createCpuContext(CLContextsManager.scala:9) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.cpuContext$lzycompute(CLContextsCache.scala:24) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.cpuContext(CLContextsCache.scala:24) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.withCpuContext(CLContextsCache.scala:28) 
[info] at pl.tarsa.sortalgobox.opencl.common.CpuSort.sort(CpuSort.scala:34) 
[info] at pl.tarsa.sortalgobox.opencl.common.CpuSort.sort(CpuSort.scala:32) 
[info] at pl.tarsa.sortalgobox.sorts.SortChecker.forEmptyArray(SortChecker.scala:31) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(CpuMergeSortSpec.scala:32) 
[info] at pl.tarsa.sortalgobox.tests.CommonUnitSpecBase.guardedOpenCLTest(CommonUnitSpecBase.scala:40) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1.apply$mcV$sp(CpuMergeSortSpec.scala:31) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1.apply(CpuMergeSortSpec.scala:31) 
[info] at pl.tarsa.sortalgobox.opencl.CpuMergeSortSpec$$anonfun$1.apply(CpuMergeSortSpec.scala:31) 
[info] at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22) 
[info] at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85) 
[info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) 
[info] at org.scalatest.Transformer.apply(Transformer.scala:22) 
[info] at org.scalatest.Transformer.apply(Transformer.scala:20) 
[info] at org.scalatest.FlatSpecLike$$anon$1.apply(FlatSpecLike.scala:1647) 
[info] at org.scalamock.scalatest.AbstractMockFactory$$anonfun$withFixture$1.apply(AbstractMockFactory.scala:35) 
[info] at org.scalamock.scalatest.AbstractMockFactory$$anonfun$withFixture$1.apply(AbstractMockFactory.scala:34) 
[info] at org.scalamock.MockFactoryBase$class.withExpectations(MockFactoryBase.scala:41) 
[info] at pl.tarsa.sortalgobox.tests.CommonUnitSpecBase.withExpectations(CommonUnitSpecBase.scala:28) 
[info] at org.scalamock.scalatest.AbstractMockFactory$class.withFixture(AbstractMockFactory.scala:34) 
[info] at pl.tarsa.sortalgobox.tests.CommonUnitSpecBase.withFixture(CommonUnitSpecBase.scala:28) 
[info] at org.scalatest.FlatSpecLike$class.invokeWithFixture$1(FlatSpecLike.scala:1644) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTest$1.apply(FlatSpecLike.scala:1656) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTest$1.apply(FlatSpecLike.scala:1656) 
[info] at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306) 
[info] at org.scalatest.FlatSpecLike$class.runTest(FlatSpecLike.scala:1656) 
[info] at org.scalatest.FlatSpec.runTest(FlatSpec.scala:1683) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTests$1.apply(FlatSpecLike.scala:1714) 
[info] at org.scalatest.FlatSpecLike$$anonfun$runTests$1.apply(FlatSpecLike.scala:1714) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401) 
[info] at scala.collection.immutable.List.foreach(List.scala:381) 
[info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401) 
[info] at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:390) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:427) 
[info] at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401) 
[info] at scala.collection.immutable.List.foreach(List.scala:381) 
[info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401) 
[info] at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396) 
[info] at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483) 
[info] at org.scalatest.FlatSpecLike$class.runTests(FlatSpecLike.scala:1714) 
[info] at org.scalatest.FlatSpec.runTests(FlatSpec.scala:1683) 
[info] at org.scalatest.Suite$class.run(Suite.scala:1424) 
[info] at org.scalatest.FlatSpec.org$scalatest$FlatSpecLike$$super$run(FlatSpec.scala:1683) 
[info] at org.scalatest.FlatSpecLike$$anonfun$run$1.apply(FlatSpecLike.scala:1760) 
[info] at org.scalatest.FlatSpecLike$$anonfun$run$1.apply(FlatSpecLike.scala:1760) 
[info] at org.scalatest.SuperEngine.runImpl(Engine.scala:545) 
[info] at org.scalatest.FlatSpecLike$class.run(FlatSpecLike.scala:1760) 
[info] at org.scalatest.FlatSpec.run(FlatSpec.scala:1683) 
[info] at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:462) 
[info] at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:671) 
[info] at sbt.TestRunner.runTest$1(TestFramework.scala:76) 
[info] at sbt.TestRunner.run(TestFramework.scala:85) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202) 
[info] at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:185) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202) 
[info] at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202) 
[info] at sbt.TestFunction.apply(TestFramework.scala:207) 
[info] at sbt.Tests$$anonfun$9.apply(Tests.scala:216) 
[info] at sbt.Tests$$anonfun$9.apply(Tests.scala:216) 
[info] at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:44) 
[info] at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:44) 
[info] at sbt.std.Transform$$anon$4.work(System.scala:63) 
[info] at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226) 
[info] at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226) 
[info] at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17) 
[info] at sbt.Execute.work(Execute.scala:235) 
[info] at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226) 
[info] at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226) 
[info] at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159) 
[info] at sbt.CompletionService$$anon$2.call(CompletionService.scala:28) 
[info] at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
[info] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[info] at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
[info] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[info] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[info] at java.lang.Thread.run(Thread.java:745) 
[info] ---(end of nested stack traces)--- 
[info] at org.jocl.LibUtils.loadLibrary(LibUtils.java:122) 
[info] at org.jocl.CL.<clinit>(CL.java:47) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextDescription$.enumerate(CLContextDescription.scala:44) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.contextsDescriptions$lzycompute(CLContextsManager.scala:6) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.contextsDescriptions(CLContextsManager.scala:6) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsManager$.createCpuContext(CLContextsManager.scala:9) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.cpuContext$lzycompute(CLContextsCache.scala:24) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.cpuContext(CLContextsCache.scala:24) 
[info] at pl.tarsa.sortalgobox.opencl.common.CLContextsCache$.withCpuContext(CLContextsCache.scala:28) 
[info] at pl.tarsa.sortalgobox.opencl.common.CpuSort.sort(CpuSort.scala:34) 

Những lỗi không xuất hiện cho các bài kiểm tra trong mô-đun đầu tiên/tiểu dự án phụ thuộc vào JOCL. Tức là khi tôi làm bài kiểm tra "./activator" thì các bài kiểm tra OpenCL từ một số công việc mô-đun (thử nghiệm đầu tiên) và tất cả các công việc khác thì không. Khi tôi làm "./activator" để sinh ra giao diện điều khiển SBT và sau đó chạy "test" nhiều lần thì lần đầu tiên nó hoạt động như bình thường "./activator test", nhưng đối với test tiếp theo thì tất cả các test OpenCL đều thất bại với UnsatisfiedLinkError.

Dưới đây là build của tôi file: https://github.com/tarsa/SortAlgoBox/blob/4a041d93beb572a6dcce100780bc675d46d814f3/project/MainBuild.scala

Theo câu trả lời này: https://stackoverflow.com/a/23157190/492749 SBT sử dụng một số classloaders ma thuật và đổi tên các thư viện nguồn gốc cho mỗi classloader như vậy. Vấn đề là JOCL giải nén các thư viện gốc trong khi tải một số lớp Java và tên tập tin và vị trí kết quả luôn giống nhau. Nói cách khác: Phép thuật của SBT không chơi tốt với phép thuật JOCL.

Giải pháp của bạn là gì?

PS: kiểm tra hoạt động tốt khi được thực thi từ bên trong IntelliJ IDEA - có thể IDEA không sử dụng ma thuật của trình nạp lớp.

Answer 1

According to this answer: https://stackoverflow.com/a/23157190/492749 SBT uses some magic classloaders and renames native libraries for each such classloader. The problem is that JOCL unpacks the native libraries during loading of some Java class and the resulting filename and location is always the same. In other words: SBT's magic doesn't play well with JOCL magic.

Điều này không xảy ra tự động đối với tôi; Tôi nghĩ rằng nó chỉ được sử dụng khi tải các plugin SBT. Tôi đã phải adapt the SBT classloader:

// adapted from sbt.classpath.NativeCopyLoader 
package scalan.compilation.lms 

import java.io.File 
import java.net.{URLClassLoader, URL} 
import java.nio.file.Files 

/** 
* Loads native libraries from a temporary location in order to work around the jvm native library uniqueness restriction. 
* 
* The loader will provide native libraries listed in `explicitLibraries` and on `searchPaths` by copying them to `tempDirectory`. 
*/ 
class NativeCopyLoader(explicitLibraries: Seq[File], searchPaths: Seq[File], urls: Array[URL], parent: ClassLoader) extends URLClassLoader(urls, parent) { 
    private[this] val mapped = new collection.mutable.HashMap[String, String] 
    private[this] val tempDirectory = Files.createTempDirectory("native-library-copies").toFile 
    tempDirectory.deleteOnExit() 

    override protected def findLibrary(name: String): String = 
    synchronized { mapped.getOrElseUpdate(name, findLibrary0(name)) } 

    private[this] def findLibrary0(name: String): String = { 
    val mappedName = System.mapLibraryName(name) 
    val explicit = explicitLibraries.filter(_.getName == mappedName).toStream 
    val search = searchPaths.toStream flatMap relativeLibrary(mappedName) 
    (explicit ++ search).headOption.map(copy).orNull 
    } 
    private[this] def relativeLibrary(mappedName: String)(base: File): Seq[File] = { 
    val f = new File(base, mappedName) 
    if (f.isFile) f :: Nil else Nil 
    } 
    private[this] def copy(f: File): String = { 
    val target = new File(tempDirectory, f.getName) 
    Files.copy(f.toPath, target.toPath) 
    target.getAbsolutePath 
    } 
} 

Và sau đó đảm bảo nó được sử dụng khi tải các lớp tải thư viện gốc. Tuy nhiên, điều này có thể cần phải sửa đổi để làm việc với phép thuật JOCL.