java.lang.ClassCastException: java.lang.Integer

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java.lang.ClassCastException: java.lang.Integer
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:585)
at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:142)
at org.mozilla.javascript.FunctionObject.call(FunctionObject.java:468)
at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:3084)
at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2250)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:149)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:337)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2755)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:147)
at com.gargoylesoftware.htmlunit.javascript.host.EventHandler.call(EventHandler.java:87)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:302)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:733)
at undefined.TestCase.testDynamicSelectBox(AdminAndSecurityTestCase.java:61)
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:585)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)

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