user = new TestRefreshableFessUser("testuser", false);
        assertFalse(user.refresh());
        assertEquals(1, user.getRefreshCount());
    }

    @Test
    public void test_serialization() {
        // Test that implementations can be serialized
        FessUser user = new TestFessUser("testuser", new String[] { "role1", "role2" }, new String[] { "group1", "group2" },

        assertTrue(cause3 instanceof RuntimeException);
        assertEquals("Level 3 error", cause3.getMessage());

        assertNull(cause3.getCause());
    }

    @Test
    public void test_serialization() throws Exception {
        // Test serialization and deserialization
        String message = "Serializable SSO exception";
        Exception cause = new RuntimeException("Serializable cause");

        assertTrue(exception instanceof RuntimeException);
        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);
    }

    @Test
    public void test_serialization() {
        // Test serialVersionUID exists
        ResultOffsetExceededException exception = new ResultOffsetExceededException("Test serialization");

        } catch (Exception e) {
            fail("Should have caught ServletRuntimeException");
        }
    }

    @Test
    public void test_serialization() {
        // Test that the serialVersionUID is properly defined
        // This test verifies that the class can be instantiated and has the serial version UID

        assertEquals("test_stackTrace", topElement.getMethodName());
        assertEquals(this.getClass().getName(), topElement.getClassName());
    }

    @Test
    public void test_serialization() {
        // Test that serialVersionUID is properly defined
        final JobProcessingException exception = new JobProcessingException("Serialization test");

        assertTrue(exception instanceof RuntimeException);
        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);
    }

    @Test
    public void test_serialization() {
        // Test serialVersionUID is properly defined
        GsaConfigException exception = new GsaConfigException("Serialization test");

        // Verify the exception is serializable (has serialVersionUID)

        assertTrue(stackTrace.length > 0);
        // The first element should be from this test method
        assertEquals("test_stackTrace", stackTrace[0].getMethodName());
    }

    @Test
    public void test_serialization() {
        // Test that the exception has proper serialVersionUID
        DataStoreException exception = new DataStoreException("Serialization test");

        // Check that it's a RuntimeException and can be thrown

        assertEquals(innerCause, exception.getCause().getCause());
        assertEquals("Invalid image format", exception.getCause().getCause().getMessage());
    }

    @Test
    public void test_serialization() {
        // Test that the exception has serialVersionUID
        ThumbnailGenerationException exception = new ThumbnailGenerationException("Test serialization");