JUnit - 初始化程序错误中的异常

我正在尝试使用静态方法测试一个类，但在这一行中出现错误：

FormReferenceDataPopulator target = new FormReferenceDataPopulator();

这是失败的痕迹：

java.lang.ExceptionInInitializerError
  at au.necdl.pexa.web.document.form.FormReferenceDataPopulatorTest.<init>(FormReferenceDataPopulatorTest.java:15)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
  at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:187)
  at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:236)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
  at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:233)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.RuntimeException: Could not locate bean of class [au.necdl.pexa.service.address.CountryService]
  at au.necdl.pexa.core.PexaContextAware.getBean(PexaContextAware.java:65)
  at au.necdl.pexa.web.document.form.FormReferenceDataPopulator.<clinit>(FormReferenceDataPopulator.java:29)    ... 23 more

堆栈跟踪中有一些线索指出错误所在

a) ExceptionIninitializerError --> FormReferenceDataPopulatorTest。 这表明错误发生在该对象的构造过程中。 ExceptionIninitializerError 特别指出在静态初始化块或变量期间发生异常

异常初始化错误抛出 ExceptionIninitializerError 来指示在计算静态初始值设定项或静态变量的初始值设定项期间发生异常。

b) 就像罗比在他的评论中指出的那样Caused by: java.lang.RuntimeException: Could not locate bean of class [au.necdl.pexa.service.address.CountryService]显示错误的确切位置。