NB200405182245 JDK 1.4.2
Steps to reproduce:
I create a MyCollectionTest junit class in
TestPackage.

It contains the following code: 
public class MyCollectionTest extends TestCase {
    
    private MyCollection collection;
    
    protected void setUp() {
        collection = new MyCollection();
    }
    
    public MyCollectionTest(java.lang.String
testName) {
        super(testName);
    }
    
    public static Test suite() {
        TestSuite suite = new
TestSuite(MyCollectionTest.class);
        return suite;
    }
    
    public void testAddString() {
        assertTrue(collection.isEmpty());
        assertEquals(0, collection.size());
       
assertTrue(!collection.containsString("string1");
        collection.addString("string1");
        assertTrue(!collection.isEmpty());
    }

Lines 
private MyCollection collection;
collection = new MyCollection(); collection.isEmpty()
collection.size()
collection.containsString()
collection.addString()
have a java annotation Cannot resolve symbol
MyCollection.
Now, I will create the class MyCollection in the
Source Packages, in the same package as the
MyCollectionTest
After creation of MyCollection, I switch back to
MyCollectionTest, and only those two following
lines are now in error: 
private MyCollection collection;
collection = new MyCollection(); 
Other ones are not any more marked as in error.

Now, I do the following:
delete the line
private MyCollection collection;
retype private MyCol|
press Ctrl-Space
NB propose MyCollection
I introduced collection;
And I finally have the same line
private MyCollection collection;
but always marked as in error.
I select MyCollection, press Alt-Shift-I to do the
import. NB confirm that MyCollection is well in
the same package than MyCollectionTest by adding
no import sentence.

I do Clean and Build.
MyCollection is now marked as compiled.
and no more Java Error Annotation appears in the
class MyCollectionTest.