Playframework 播放测试零点异常

我在终端中运行播放（1.2.5）测试
并访问localhost/@tests
那页写着

 Oops: NullPointerException
An unexpected error occured caused by exception NullPointerException:
null

然后在终端中打印以下错误堆栈

Internal Server Error (500) for request GET /@tests

Oops: NullPointerException
An unexpected error occured caused by exception NullPointerException: null

play.exceptions.UnexpectedException: Unexpected Error
    at play.Play.start(Play.java:556)
    at play.Play.detectChanges(Play.java:642)
    at play.Invoker$Invocation.init(Invoker.java:198)
    at Invocation.HTTP Request(Play!)
Caused by: java.lang.NullPointerException
    at play.classloading.ApplicationCompiler$2.acceptResult(ApplicationCompiler.java:266)
    at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:478)
    at play.classloading.ApplicationCompiler.compile(ApplicationCompiler.java:282)
    at play.classloading.ApplicationClassloader.getAllClasses(ApplicationClassloader.java:426)
    at play.Play.start(Play.java:516)
    ... 3 more

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最后，我发现了如何处理这个异常。因为我有一个包含两个类的文件

Foo.java：

public class Foo {}
class Bar{}

然后我将Bar类重写为嵌套类，一切正常！

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虽然我不知道为什么，似乎是由于eclipse java编译器的一些bug造成的，看起来像是一个空指针异常，是吗？关于你的代码试图做什么的更多细节如何？我什么也没做，只是运行play test，然后转到chrome to localhost:9000/@tests