我有以下蚂蚁目标：
<path id="test-classpath">
<fileset dir="lib">
<include name="*.jar" />
</fileset>
<pathelement path="bin/release" />
</path>
<target name="run-test">
<junit printsummary="yes" haltonfailure="yes" fork="true">
<formatter type="failure"/>
<test name="someNamespace.someTest" />
<classpath refid="test-classpath" />
</junit>
</target>
当我尝试从命令行运行它时，我会得到以下输出：
>ant run-test
Buildfile: ...build.xml
[echo] 2016-03-30 20:29:29
run-test:
[junit] Exception in thread "main" java.lang.reflect.InvocationTargetException
[junit] at org.apache.tools.ant.taskdefs.optional.junit.FormatterElement.createFormatter(FormatterElement.java:343)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.FormatterElement.createFormatter(FormatterElement.java:257)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.transferFormatters(JUnitTestRunner.java:1085)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1180)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:1033)
[junit] Caused by: java.lang.reflect.InvocationTargetException
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit] at java.lang.reflect.Method.invoke(Method.java:498)
[junit] at org.apache.tools.ant.taskdefs.optional.junit.FormatterElement.createFormatter(FormatterElement.java:337)
[junit] ... 4 more
[junit] Caused by: java.lang.NullPointerException
[junit] at org.apache.tools.ant.taskdefs.optional.junit.FailureRecorder.setProject(FailureRecorder.java:153)
[junit] ... 9 more
BUILD FAILED
...build.xml:171: Using loader AntClassLoader[
C:Program Files (x86)apache-ant-1.9.6libant-launcher.jar;
C:Program Files (x86)apache-ant-1.9.6libant.jar;
C:Program Files (x86)apache-ant-1.9.6libant-junit.jar;
C:Program Files (x86)apache-ant-1.9.6libant-junit4.jar;
...libcommons-math3-3.5.jar;
...libhamcrest-core-1.3.jar;
...libjunit-4.11.jar;
...liblog4j-api-2.5.jar;
...liblog4j-core-2.5.jar;
...binrelease] on class org.apache.tools.ant.taskdefs.optional.junit.FailureRecorder:
java.lang.NoClassDefFoundError: junit/framework/TestListener
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)
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)
at org.apache.tools.ant.AntClassLoader.findBaseClass(AntClassLoader.java:1407)
at org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1085)
at org.apache.tools.ant.util.SplitClassLoader.loadClass(SplitClassLoader.java:58)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.apache.tools.ant.taskdefs.optional.junit.FormatterElement.createFormatter(FormatterElement.java:287)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.logVmExit(JUnitTask.java:1854)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.logVmCrash(JUnitTask.java:1818)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.executeAsForked(JUnitTask.java:1295)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:1024)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.executeOrQueue(JUnitTask.java:2105)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:832)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
at org.apache.tools.ant.Main.runBuild(Main.java:853)
at org.apache.tools.ant.Main.startAnt(Main.java:235)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:112)
Caused by: java.lang.ClassNotFoundException: junit.framework.TestListener
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 51 more
Total time: 3 seconds
测试在Eclipse Mars（4.5.2）中成功运行。有人知道为什么会发生这种情况吗？以及我如何让我的JUnit测试在ant中运行？我使用的是JUnit 4.11，并尝试过ant v1.9.3和v1.9.6（上面的输出是从ant v1.9.6生成的）
编辑
根据评论中的建议，我还使用ant v1.8.4进行了测试，但这对导致的崩溃没有任何影响（除了jar文件的版本号）。
根据这个问题-找不到Ant、Ivy和JUnit的class-build.xml中有错误？-ant 1.9+中有一个bug，你应该试试ant 1.8.4。
我终于弄清楚问题出在哪里了。我的JUnit任务类路径不正确，因为我忘记了包含测试套件类的位置。一旦我纠正了类路径，一切都如预期的那样工作。尽管如此，我觉得这是一个应该由Ant或JUnit团队解决的错误。诸如"类XXX无法加载"之类的消息会更有帮助。