JUnit 5在调试模式下会截断堆栈跟踪并使JVM崩溃

Question

我现在正在尝试JUnit 5，但有两个问题：

1）在调试模式下，当beign空闲一段时间后，我遇到了JVM崩溃的问题，即，当我一步一步地停止而不是停下来超过3-5秒时，一切正常，但是如果我停下来进行一些评估或者只是因为我需要在调试过程中进行其他操作，因此花费了超过10到15秒的时间，然后在尝试进行下一步操作时JVM崩溃。

2）JUnit 5截断了堆栈跟踪，仅留下一个无意义的字符串（带有测试文件的行，而不是引发异常的实际行）。这是此类输出的示例：

Running ru.ahml.ficb.generators.GeneratorTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 3.418 sec <<< FAILURE! - in ru.ahml.ficb.generators.GeneratorTest
test  Time elapsed: 3.359 sec  <<< ERROR!
java.lang.NullPointerException
    at ru.ahml.ficb.generators.GeneratorTest.test(GeneratorTest.java:44)


Results :

Tests in error:
  GeneratorTest.test:44 » NullPointer

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

绝对不知道这个NPE发生在哪里！这是JUnit 4显示的内容：

Running ru.ahml.ficb.generators.GeneratorTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 3.541 sec <<< FAILURE!
test(ru.ahml.ficb.generators.GeneratorTest)  Time elapsed: 3.4 sec  <<< ERROR!
java.lang.NullPointerException
    at ru.ahml.ficb.excel.generators.ordersgpb.Generator.fillTable(Generator.java:268)
    at ru.ahml.ficb.excel.generators.ordersgpb.Generator.fillSheet(Generator.java:122)
    at ru.ahml.ficb.excel.generators.ordersgpb.Generator.generate(Generator.java:64)
    at ru.ahml.ficb.generators.GeneratorTest.test(GeneratorTest.java:44)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
    at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
    at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
    at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)


Results :

Tests in error: 
  test(ru.ahml.ficb.generators.GeneratorTest)

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

一切都清楚了！

在使用JUnit 5时，如何使JUnit 5显示与JUnit 4相同的堆栈跟踪以及如何防止JVM在调试模式下崩溃？

Answer 1

“JUnit 5”不会截断堆栈跟踪。

在这里，由于默认设置，Surefire 确实修剪了堆栈跟踪：http://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#trimStackTrace

将其设置为false这样：

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-surefire-plugin</artifactId>
  <version>2.19.1</version>
  <configuration>
    <trimStackTrace>false</trimStackTrace>
  </configuration>
</plugin>

应防止修剪。