java.lang.Exception: TestIterator.init() must return an Iterable of arrays.

    at org.junit.runners.Parameterized.parametersMethodReturnedWrongType(Parameterized.java:343)

    at org.junit.runners.Parameterized.createRunnersForParameters(Parameterized.java:326)

    at org.junit.runners.Parameterized.<init>(Parameterized.java:282)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

    at java.lang.reflect.Constructor.newInstance(Unknown Source)

    at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:29)

    at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:21)

    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)

    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)

    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)

    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:26)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)

    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)

    private void createRunnersForParameters(Iterable<Object[]> allParameters,

            String namePattern) throws InitializationError, Exception {

        try {

            int i = 0;

            for (Object[] parametersOfSingleTest : allParameters) {

                String name = nameFor(namePattern, i, parametersOfSingleTest);

                TestClassRunnerForParameters runner = new TestClassRunnerForParameters(

                        getTestClass().getJavaClass(), parametersOfSingleTest,

                        name);

                runners.add(runner);

                ++i;

            }

        } catch (ClassCastException e) {

            throw parametersMethodReturnedWrongType();

        }

    }