java.lang.IncompatibleClassChangeError：使用ScalaCheck和ScalaTest实现类

Question

当使用ScalaCheck和ScalaTest编写测试时，我正面临一个讨厌的异常。这里是我的依赖关系：

libraryDependencies ++= Seq(
    "org.scalatest" %% "scalatest" % "2.2.6" % "test", 
    "org.scalacheck" %% "scalacheck" % "1.13.0" % "test" 
) 

这里是我的测试：

import org.scalatest.PropSpec 
import org.scalatest.prop.Checkers 

class MyPropSpec extends PropSpec with Checkers { 

    property("List.concat") { 
    check((a: List[Int], b: List[Int]) => a.size + b.size == (a ::: b).size) 
    } 
} 

当我尝试运行此我得到：

DeferredAbortedSuite: 
Exception encountered when attempting to run a suite with class name:  org.scalatest.DeferredAbortedSuite *** ABORTED *** 
    java.lang.IncompatibleClassChangeError: Implementing class 
    at java.lang.ClassLoader.defineClass1(Native Method) 
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) 
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) 
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) 
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
    ... 
    java.lang.IncompatibleClassChangeError: Implementing class 
    at java.lang.ClassLoader.defineClass1(Native Method) 
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760) 
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) 
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) 
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
    ... 

缺少什么我在这里？

Answer 1

ScalaTest 2.2.6与ScalaCheck 1.13.0不兼容。降级为“scalacheck”％“1.12.5”有帮助。

这报告为https://github.com/rickynils/scalacheck/issues/217。该问题是关闭以下决议：

All current releases of ScalaTest (2.2.6, 3.0.0 etc) are built against ScalaCheck 1.12.1 (see https://github.com/scalatest/scalatest/blob/master/project/scalatest.scala#L134). Therefore, there are no guarantees that you can simply swap out ScalaCheck 1.12.x for 1.13.y. ScalaCheck only maintains binary compatibility within the same minor version series (1.12.1, 1.12.2, 1.12.3 etc).