Cannot set Boolean value through reflection

I am not able to set a Boolean value to a field using java reflection. The field data type is java.lang.Boolean. however, i am able to set the value if the data type is primitive type i.e boolean.

Here is a simple VO with Boolean type and primitive type:

public class TestVO {
    private Boolean bigBoolean;
    private boolean smallBoolean;
}

Here is my java reflection code:

public class TestClass {
    public static void main(String args[])
            throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException {
        TestVO testVO1 = new TestVO();

        Class testVO = testVO1.getClass();
        Field smallBooleanField = TestVO.class.getDeclaredField("smallBoolean");
        Field bigBooleanField = TestVO.class.getDeclaredField("bigBoolean");

        String name1 = smallBooleanField.getName();
        System.out.println("SmallBoolean Fieldname is: " + name1);

        smallBooleanField.setAccessible(true);

        // get the value of this private field
        Boolean fieldValue = (Boolean) smallBooleanField.get(testVO1);
        System.out.println("fieldValue = " + fieldValue);

        smallBooleanField.setAccessible(true);
        smallBooleanField.setBoolean(testVO1, true);

        // get the value of this private field
        fieldValue = (Boolean) smallBooleanField.get(testVO1);
        System.out.println("fieldValue = " + fieldValue);

        name1 = bigBooleanField.getName();
        System.out.println("bigBooleanField Fieldname is: " + name1);

        bigBooleanField.setAccessible(true);

        // get the value of this private field
        fieldValue = (Boolean) bigBooleanField.get(testVO1);
        System.out.println("fieldValue = " + fieldValue);

        bigBooleanField.setAccessible(true);
        bigBooleanField.setBoolean(testVO1, new Boolean(true));

        // get the value of this private field
        fieldValue = (Boolean) bigBooleanField.get(testVO1);
        System.out.println("fieldValue = " + fieldValue);

    }
}

Output is:

SmallBoolean Fieldname is: smallBoolean fieldValue = false fieldValue = true bigBooleanField Fieldname is: bigBoolean fieldValue = null Exception in thread "main" java.lang.IllegalArgumentException: Can not set java.lang.Boolean field TestVO.bigBoolean to (boolean)true at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:175) at sun.reflect.UnsafeObjectFieldAccessorImpl.setBoolean(UnsafeObjectFieldAccessorImpl.java:90) at java.lang.reflect.Field.setBoolean(Field.java:795) at TestClass.main(TestClass.java:44)

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i tried to set the bigBoolean value with new Boolean(true), Boolean.TRUE, true etc. nothing works. please help.