Could not load JNR C Library in Unit Testing

[ayush....@knoldus.in]

I am try to use Embedded Cassandra during my unit test cases for my lagom service impl.
But everytime I get this error

17:23:52.275 [pool-1-thread-1] DEBUG com.datastax.driver.core.Native - Could not load JNR C Library, native system calls through this library will not be available
java.lang.IncompatibleClassChangeError: Found interface org.objectweb.asm.ClassVisitor, but class was expected
    at jnr.ffi.provider.jffi.AsmLibraryLoader.generateInterfaceImpl(AsmLibraryLoader.java:74)
    at jnr.ffi.provider.jffi.AsmLibraryLoader.loadLibrary(AsmLibraryLoader.java:59)
    at jnr.ffi.provider.jffi.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:43)
    at jnr.ffi.LibraryLoader.load(LibraryLoader.java:290)
    at jnr.ffi.LibraryLoader.load(LibraryLoader.java:269)
    at com.datastax.driver.core.Native$LibCLoader.<clinit>(Native.java:108)
    at com.datastax.driver.core.Native.isGettimeofdayAvailable(Native.java:190)
    at com.datastax.driver.core.ClockFactory.newInstance(Clock.java:51)
    at com.datastax.driver.core.AbstractMonotonicTimestampGenerator.<init>(AbstractMonotonicTimestampGenerator.java:43)
    at com.datastax.driver.core.LoggingMonotonicTimestampGenerator.<init>(LoggingMonotonicTimestampGenerator.java:49)
    at com.datastax.driver.core.AtomicMonotonicTimestampGenerator.<init>(AtomicMonotonicTimestampGenerator.java:50)
    at com.datastax.driver.core.AtomicMonotonicTimestampGenerator.<init>(AtomicMonotonicTimestampGenerator.java:37)
    at com.datastax.driver.core.policies.Policies.defaultTimestampGenerator(Policies.java:121)
    at com.datastax.driver.core.policies.Policies$Builder.build(Policies.java:286)
    at com.datastax.driver.core.Cluster$Builder.getConfiguration(Cluster.java:1317)
    at com.datastax.driver.core.Cluster.<init>(Cluster.java:113)
    at com.datastax.driver.core.Cluster.buildFrom(Cluster.java:178)
    at com.datastax.driver.core.Cluster$Builder.build(Cluster.java:1335)


Because of this, I uanble to start my embedded cassandra
7:23:52.517 [pool-1-thread-1] DEBUG com.datastax.driver.core.ControlConnection - [Control connection] error on localhost/127.0.0.1:9042 connection, no more host to try
com.datastax.driver.core.exceptions.TransportException: [localhost/127.0.0.1:9042] Cannot connect

Even when I used external cassandra for the same test cases. It will work perfectly fine.

[Ignasi Marimon-Clos i Sunyol]

Hi Ayush,

any chance you can share some code (sources for the tests, build.sbt or pom.xml, etc...) or even push into GitHub a sample project demonstrating the error?

Thanks,

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[ayush....@knoldus.in]

Yes, I can
This is the body of my test case

{
  val pointSource = Source.fromIterator(() => Seq(jsonGenerator).toIterator)
  val stream = pointSource.via(eventServiceSubscriber.subscriberFlow).runWith(Sink.ignore)

  val futureResponse = for{
    res <- stream
  }yield res

  futureResponse.map(res => assert(res === Done & stream.isCompleted))
}

Before that, I said simply create the server

lazy val server: ServiceTest.TestServer[EventServiceApplication with LocalServiceLocator] =
  ServiceTest.startServer{ServiceTest.defaultSetup}{ ctx => new EventServiceApplication(ctx) with LocalServiceLocator}

& my build.sbt looks like

)
  .enablePlugins(LagomScala)
  .settings(
    scalaVersion := scalaVer,
    excludeDependencies += "org.slf4j" % "slf4j-log4j12",
    excludeDependencies += "org.slf4j" % "log4j-over-slf4j",
    dependencyOverrides += "com.fasterxml.jackson.core" % "jackson-core" % "2.8.7",
    dependencyOverrides += "com.fasterxml.jackson.core" % "jackson-databind" % "2.8.7",
    dependencyOverrides += "com.fasterxml.jackson.module" % "jackson-module-scala_2.11" % "2.8.7",
    scalastyleConfig in Compile := file("sample-scalastyle-config-v0.1.xml"),
    libraryDependencies ++= Seq(
      lagomScaladslPersistenceCassandra,
      lagomScaladslKafkaClient,
      lagomScaladslTestKit,
      macwire,
      scalaTest
    )
  )
  .settings(lagomForkedTestSettings: _*)

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[Tim Moore]

Ayush, are you still having this problem?

I would suspect the dependencyOverrides in your build.sbt, since it's reporting an IncompatibleClassChangeError. This could happen if you have the wrong version of a library on your classpath.

Can you remove the dependencyOverrides? Does that help?

What eviction warnings do you see? Run "sbt evicted" to print them. Some amount are normal and expected, but in some cases they can signal problems. Look for any involving JNR or ASM.

Best,

Tim

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Tim Moore

Lagom Tech Lead, Lightbend, Inc.

tim....@lightbend.com
+61 420 981 589
Skype: timothy.m.moore