#vulnerable code 
                                @Test
    public void defaultRandomGeneratorServicePrePopulated() {
        // JDK 5 only supports 42 of the 44 possible types. (java.util.ArrayDeque does not exist in JDK5).
        String javaVersion = System.getProperty("java.version");
        if (javaVersion.startsWith("1.6") || javaVersion.startsWith("1.7") || javaVersion.startsWith("1.8")) {
            System.out.println("Found that many types: " + expectedDefaultTypes.size());
            for (Class<?> expectedEntry : expectedDefaultTypes) {
                boolean found = false;
                for (Class<?> foundEntry : randomGeneratorService.getRegisteredTypes()) {
                    if (expectedEntry == foundEntry) found = true;
                }
                if (!found) System.out.println("\"" + expectedEntry.getName() + "\"");
            }
            System.out.println("Registered and not in the expected list!!");
            for (Class<?> foundEntry : randomGeneratorService.getRegisteredTypes()) {
                boolean found = false;
                for (Class<?> expectedEntry : expectedDefaultTypes) {
                    if (expectedEntry == foundEntry) found = true;
                }
                if (!found) System.out.println("\"" + foundEntry.getName() + "\"");
            }
            Affirm.affirmEquals("Types added / removed?", expectedTypes, randomGeneratorService.getRegisteredTypes().size());
        } else {
            if (javaVersion.startsWith("1.5")) {
                Affirm.affirmEquals("Types added / removed?", expectedTypes - 1, // (java.util.ArrayDeque does not exist
                        // in JDK5),
                        randomGeneratorService.getRegisteredTypes().size());
            } else {
                Affirm.fail("Unknown java version found " + System.getProperty("java.version") + " please check the " +
                        "correct number of expected registered classes and register type here - (found " + randomGeneratorService
                        .getRegisteredTypes().size() + ")");
            }
        }
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Test
    public void defaultRandomGeneratorServicePrePopulated() {
        reportDifferences();
        Affirm.affirmEquals("Types added / removed?", expectedTypes, randomGeneratorService.getRegisteredTypes().size());
    }