try {
            // Use reflection to verify ProcessDestroyer class exists
            final Class<?> destroyerClass = Class.forName("org.codelibs.fess.thumbnail.impl.CommandGenerator$ProcessDestroyer");
            assertNotNull("ProcessDestroyer class should exist", destroyerClass);
            assertTrue("ProcessDestroyer should extend TimerTask", java.util.TimerTask.class.isAssignableFrom(destroyerClass));