我有一个小应用程序，电话簿，我想测试它。我对 uispec4j 有一些问题，我写这个：
public class TestRubricaBlack extends UISpecTestCase{
@BeforeClass
public void setUp(){
setAdapter(new MainClassAdapter(Rubrica.class, new String[0]));
}
public void testMamma(){
Window window=getMainWindow();
assertEquals(true,window.getButton("index").isVisible());
}
}
当我尝试执行测试时，出现此错误，问题出在函数 getMainWindow() 上：
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at org.uispec4j.utils.TriggerRunner.runInCurrentThread(TriggerRunner.java:18)
at org.uispec4j.interception.WindowInterceptor.run(WindowInterceptor.java:320)
at org.uispec4j.interception.WindowInterceptor.run(WindowInterceptor.java:290)
at org.uispec4j.interception.MainClassAdapter.getMainWindow(MainClassAdapter.java:24)
at org.uispec4j.UISpecTestCase.getMainWindow(UISpecTestCase.java:84)
at it.is2.TestRubricaBlack.testMamma(TestRubricaBlack.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
at junit.framework.TestSuite.run(TestSuite.java:238)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
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.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.uispec4j.utils.MainClassTrigger.run(MainClassTrigger.java:22)
at org.uispec4j.utils.TriggerRunner.runInCurrentThread(TriggerRunner.java:12)
... 24 more
Caused by: java.lang.NullPointerException: peer
at sun.awt.windows.WTextFieldPeer.create(Native Method)
at sun.awt.windows.WComponentPeer.<init>(WComponentPeer.java:595)
at sun.awt.windows.WTextComponentPeer.<init>(WTextComponentPeer.java:36)
at sun.awt.windows.WTextFieldPeer.<init>(WTextFieldPeer.java:65)
at sun.awt.windows.WToolkit.createTextField(WToolkit.java:332)
at org.uispec4j.interception.toolkit.ToolkitDelegate.createTextField(ToolkitDelegate.java:262)
at java.awt.TextField.addNotify(TextField.java:205)
at java.awt.Container.addNotify(Container.java:2592)
at javax.swing.JComponent.addNotify(JComponent.java:4683)
at java.awt.Container.addNotify(Container.java:2592)
at javax.swing.JComponent.addNotify(JComponent.java:4683)
at java.awt.Container.addNotify(Container.java:2592)
at javax.swing.JComponent.addNotify(JComponent.java:4683)
at java.awt.Container.addNotify(Container.java:2592)
at javax.swing.JComponent.addNotify(JComponent.java:4683)
at javax.swing.JRootPane.addNotify(JRootPane.java:735)
at java.awt.Container.addNotify(Container.java:2592)
at java.awt.Window.addNotify(Window.java:638)
at java.awt.Frame.addNotify(Frame.java:469)
at java.awt.Window.show(Window.java:823)
at it.is2.Rubrica.main(Rubrica.java:26)
... 30 more
有人能帮我吗？提前致谢