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我有以下Ant目標：螞蟻junit任務失敗運行測試之前
<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>
當我嘗試從命令行運行它，我得到以下輸出：
>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-1.9.6\lib\ant-launcher.jar;
C:\Program Files (x86)\apache-ant-1.9.6\lib\ant.jar;
C:\Program Files (x86)\apache-ant-1.9.6\lib\ant-junit.jar;
C:\Program Files (x86)\apache-ant-1.9.6\lib\ant-junit4.jar;
...\lib\commons-math3-3.5.jar;
...\lib\hamcrest-core-1.3.jar;
...\lib\junit-4.11.jar;
...\lib\log4j-api-2.5.jar;
...\lib\log4j-core-2.5.jar;
...\bin\release] 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
測試在Eclipse Mars（4.5.2）中成功運行。有誰知道爲什麼會發生這種情況，以及如何讓我的JUnit測試通過ant運行？我使用JUnit 4.11，並嘗試過ant v1.9.3和v1.9.6（上面的輸出是從ant v1.9.6生成的）。
編輯
我用螞蟻v1.8.4，每註釋中的建議也測試過，但沒有（比jar文件的版本號等）上所產生的碰撞產生任何影響。
可能重複[類未找到Ant，常春藤和JUnit - 錯誤build.xml？]（http://stackoverflow.com/questions/15979391/class-not-found-with-ant-ivy-and -junit-error-in-build-xml） – kryger
@kryger我認爲這個問題的答案是你鏈接到的問題的評論，所以我不認爲它是重複的類。 – zode64
@kryger由於兩個原因，該問題沒有回答我的問題。首先，問題表明OP打開了一個[ant bug]（https://bz.apache.org/bugzilla/show_bug.cgi?id=54835），但該bug在ant 1.9.6中被關閉。我在該版本中進行了測試，問題依然存在。其次，即使我嘗試使用ant 1.8.4，也會產生完全相同的堆棧跟蹤（jar文件中的不同版本號）。 –