不兼容的 ClassChangeError in Scala Spring-Boot application.

Question

我目前在使用JUnit Vintage测试我的Scala - Spring Boot应用程序时遇到了一个奇怪的异常。

java.lang.IncompatibleClassChangeError: org.myapp.SampleWebApplication and org.myapp.SampleWebApplication$delayedInit$body disagree on InnerClasses attribute
at java.lang.Class.getDeclaringClass0(Native Method)
at java.lang.Class.getDeclaringClass(Class.java:1235)
at java.lang.Class.getEnclosingClass(Class.java:1277)
at java.lang.Class.getSimpleBinaryName(Class.java:1443)
at java.lang.Class.isMemberClass(Class.java:1433)
at org.junit.internal.builders.AnnotatedBuilder.getEnclosingClassForNonStaticMemberClass(AnnotatedBuilder.java:94)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:83)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder.runnerForClass(DefensiveAllDefaultPossibilitiesBuilder.java:56)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.vintage.engine.discovery.TestClassRequestResolver.createRunnerTestDescriptor(TestClassRequestResolver.java:55)
at org.junit.vintage.engine.discovery.VintageDiscoverer.lambda$discover$0(VintageDiscoverer.java:53)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312)
at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:742)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at org.junit.vintage.engine.discovery.VintageDiscoverer.discover(VintageDiscoverer.java:55)
at org.junit.vintage.engine.VintageTestEngine.discover(VintageTestEngine.java:61)
at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:130)
at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:117)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

这是入口点，它是引发错误的类。

object SampleWebApplication extends App{
SpringApplication.run(classOf[Application])
}

然而！如果我将代码更改为此(不扩展应用程序(，则错误将停止出现。

object SampleWebApplication {
def main(args : Array[String]) : Unit = {
SpringApplication.run(classOf[Application])
}
}

您对我遇到此错误的原因有什么建议吗？为什么删除"扩展应用程序"可以解决我的问题？ 任何帮助真的非常感谢。

Answer 1

我发现了这个问题。Scala 2.12.6 中有一个错误(在 2.13.x 中修复(。由于我目前正在从事的项目，我无法提升版本。

无法更新 Scala 版本时的解决方法：

1.一种解决方法是从 JUnit Vintage -> JUnit Jupiter 更新测试框架。
2.第二种解决方法(我所做的解决方法(是更改应用程序的入口点(见下文(。

object SampleWebApplication {
def main(args : Array[String]) : Unit = {
SpringApplication.run(classOf[Application])
}
}