Was not able to reproduce with 6.5 FCS.
Please reopen and attach a sample, if it's yet the case for you.

AFAICS the error still occurs. I used version 6.5.1 and got the same results apart from some extra annotations.
I will attach the project so you should be able to check the result. The following focuses on the issue.

If I code the following class:

public class TestClass {
    Date date;

    public TestClass(Date date) {
        this.date = date;
    }

    public boolean isLater(Date toDate) {
        return this.date.compareTo(toDate) > 0;
    }

}


The testcode generated for the isLaterDate() method looks like this:

    /**
     * Test of isLater method, of class TestClass.
     */
    @Test
    public void testIsLater() {
        System.out.println("isLater");
        Date toDate = null;
        TestClass instance = null;
        boolean expResult = false;
        boolean result = instance.isLater(toDate);
        assertEquals(expResult, result);
        // TODO review the generated test code and remove the default call to fail.
        fail("The test case is a prototype.");
    }
Now, setting an instance to null and consequently calling it, will always result in an exception. So, this code will
barf by definition.
At the time I was just wondering whether the testcase could be generated in a more obliging way, like:

    public void testIsLater() {
        System.out.println("isLater");
        Date toDate = new Date();
        TestClass instance = new TestClass(new Date());    // You could also test new TestClass(null)
        boolean expResult = false;
        boolean result = instance.isLater(toDate);
        assertEquals(expResult, result);
        // TODO review the generated test code and remove the default call to fail.
        fail("The test case is a prototype.");
    }

I realise this is not lifesaving code. I just feel that we should not have errors in the code we generate.

Hope this helps.

Created attachment 79008 [details]
A tarred gz file with test code (a netbeans 6.5.1 project)

Got the point. Thank you.