我只是被 Akka 弄湿了。我正在尝试使用来自此 Maven 依赖项的 JavaTestKit 编写 JUNit 测试:
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-actor_2.10</artifactId>
<version>2.3.12</version>
</dependency>
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-testkit_2.11</artifactId>
<version>2.3.12</version>
</dependency>
即使是不执行任何操作的 JavaTestKit 实例也会引发致命异常,因此我怀疑存在配置问题。此类将重现该问题:
import akka.actor.ActorSystem;
import akka.event.Logging;
import akka.event.LoggingAdapter;
import akka.testkit.JavaTestKit;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
public class GameTest {
static ActorSystem system;
static LoggingAdapter log;
@BeforeClass
public static void setup() {
system = ActorSystem.create();
log = Logging.getLogger(system, GameTest.class);
}
@AfterClass
public static void teardown() {
JavaTestKit.shutdownActorSystem(system);
system = null;
}
@Test
public void gutterGameTest() {
log.info("gutterGameTest started");
new JavaTestKit(system) {{
// even when empty, the exception is thrown during initialization
}};
}
}
这是一个例外:
[ERROR] [08/20/2015 07:55:10.614] [default-akka.actor.default-dispatcher-4] [ActorSystem(default)] Uncaught error from thread [default-akka.actor.default-dispatcher-4] shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled
java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
at akka.testkit.CallingThreadDispatcherQueues.registerQueue(CallingThreadDispatcher.scala:64)
at akka.testkit.CallingThreadMailbox$$anon$1.initialValue(CallingThreadDispatcher.scala:318)
at akka.testkit.CallingThreadMailbox$$anon$1.initialValue(CallingThreadDispatcher.scala:315)
at java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:180)
at java.lang.ThreadLocal.get(ThreadLocal.java:170)
...
我正在使用默认配置。为了让 JavaTestKit 按预期工作,我还需要设置什么吗?