#vulnerable code 
                                @Test
    public void testMissingRootLogger() throws Exception {
        PluginManager.addPackage("org.apache.logging.log4j.test.appender");
        final LoggerContext ctx = Configurator.initialize("Test1", "missingRootLogger.xml");
        final Logger logger = LogManager.getLogger("sample.Logger1");
        final Configuration config = ctx.getConfiguration();
        assertNotNull("Config not null", config);
//        final String MISSINGROOT = "MissingRootTest";
//        assertTrue("Incorrect Configuration. Expected " + MISSINGROOT + " but found " + config.getName(),
//                MISSINGROOT.equals(config.getName()));
        final Map<String, Appender> map = config.getAppenders();
        assertNotNull("Appenders not null", map);
        assertEquals("Appenders Size", 2, map.size());
        assertTrue("Contains List", map.containsKey("List"));
        assertTrue("Contains Console", map.containsKey("Console"));

        final Map<String, LoggerConfig> loggerMap = config.getLoggers();
        assertNotNull("loggerMap not null", loggerMap);
        assertEquals("loggerMap Size", 1, loggerMap.size());
        // only the sample logger, no root logger in loggerMap!
        assertTrue("contains key=sample", loggerMap.containsKey("sample"));

        final LoggerConfig sample = loggerMap.get("sample");
        final Map<String, Appender> sampleAppenders = sample.getAppenders();
        assertEquals("sampleAppenders Size", 1, sampleAppenders.size());
        // sample only has List appender, not Console!
        assertTrue("sample has appender List", sampleAppenders.containsKey("List"));

        final AbstractConfiguration baseConfig = (AbstractConfiguration) config;
        final LoggerConfig root = baseConfig.getRootLogger();
        final Map<String, Appender> rootAppenders = root.getAppenders();
        assertEquals("rootAppenders Size", 1, rootAppenders.size());
        // root only has Console appender!
        assertTrue("root has appender Console", rootAppenders.containsKey("Console"));
        assertEquals(Level.ERROR, root.getLevel());

        logger.isDebugEnabled();
        Configurator.shutdown(ctx);
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Test
    public void testMissingRootLogger() throws Exception {
        final LoggerContext ctx = context.getContext();
        final Logger logger = ctx.getLogger("sample.Logger1");
        assertTrue("Logger should have the INFO level enabled", logger.isInfoEnabled());
        assertFalse("Logger should have the DEBUG level disabled", logger.isDebugEnabled());
        final Configuration config = ctx.getConfiguration();
        assertNotNull("Config not null", config);
//        final String MISSINGROOT = "MissingRootTest";
//        assertTrue("Incorrect Configuration. Expected " + MISSINGROOT + " but found " + config.getName(),
//                MISSINGROOT.equals(config.getName()));
        final Map<String, Appender> map = config.getAppenders();
        assertNotNull("Appenders not null", map);
        assertEquals("There should only be two appenders", 2, map.size());
        assertTrue("Contains List", map.containsKey("List"));
        assertTrue("Contains Console", map.containsKey("Console"));

        final Map<String, LoggerConfig> loggerMap = config.getLoggers();
        assertNotNull("loggerMap not null", loggerMap);
        assertEquals("There should only be one configured logger", 1, loggerMap.size());
        // only the sample logger, no root logger in loggerMap!
        assertTrue("contains key=sample", loggerMap.containsKey("sample"));

        final LoggerConfig sample = loggerMap.get("sample");
        final Map<String, Appender> sampleAppenders = sample.getAppenders();
        assertEquals("The sample logger should only have one appender", 1, sampleAppenders.size());
        // sample only has List appender, not Console!
        assertTrue("The sample appender should be a ListAppender", sampleAppenders.containsKey("List"));

        final AbstractConfiguration baseConfig = (AbstractConfiguration) config;
        final LoggerConfig root = baseConfig.getRootLogger();
        final Map<String, Appender> rootAppenders = root.getAppenders();
        assertEquals("The root logger should only have one appender", 1, rootAppenders.size());
        // root only has Console appender!
        assertTrue("The root appender should be a ConsoleAppender", rootAppenders.containsKey("Console"));
        assertEquals(Level.ERROR, root.getLevel());
    }