#fixed code
                                public ProtocolProcessor init(IConfig props) {
        subscriptions = new SubscriptionsStore();

        m_mapStorage = new MapDBPersistentStore(props);
        m_mapStorage.initStore();
        IMessagesStore messagesStore = m_mapStorage.messagesStore();
        ISessionsStore sessionsStore = m_mapStorage.sessionsStore(messagesStore);

        List<InterceptHandler> observers = new ArrayList<>();
        String interceptorClassName = props.getProperty("intercept.handler");
        if (interceptorClassName != null && !interceptorClassName.isEmpty()) {
            try {
                InterceptHandler handler = Class.forName(interceptorClassName).asSubclass(InterceptHandler.class).newInstance();
                observers.add(handler);
            } catch (Throwable ex) {
                LOG.error("Can't load the intercept handler {}", ex);
            }
        }
        m_interceptor = new BrokerInterceptor(observers);

        subscriptions.init(sessionsStore);

        String configPath = System.getProperty("moquette.path", null);
        String authenticatorClassName = props.getProperty(Constants.AUTHENTICATOR_CLASS_NAME, "");

        IAuthenticator authenticator = null;
        if (!authenticatorClassName.isEmpty()) {
            authenticator = (IAuthenticator)loadClass(authenticatorClassName, IAuthenticator.class);
            LOG.info("Loaded custom authenticator {}", authenticatorClassName);
        }

        if (authenticator == null) {
            String passwdPath = props.getProperty(PASSWORD_FILE_PROPERTY_NAME, "");
            if (passwdPath.isEmpty()) {
                authenticator = new AcceptAllAuthenticator();
            } else {
                authenticator = new FileAuthenticator(configPath, passwdPath);
            }
        }

        IAuthorizator authorizator = null;
        String authorizatorClassName = props.getProperty(Constants.AUTHORIZATOR_CLASS_NAME, "");
        if (!authorizatorClassName.isEmpty()) {
            authorizator = (IAuthorizator)loadClass(authorizatorClassName, IAuthorizator.class);
            LOG.info("Loaded custom authorizator {}", authorizatorClassName);
        }

        if (authorizator == null) {
            String aclFilePath = props.getProperty(ACL_FILE_PROPERTY_NAME, "");
            if (aclFilePath != null && !aclFilePath.isEmpty()) {
                authorizator = new DenyAllAuthorizator();
                File aclFile = new File(configPath, aclFilePath);
                try {
                    authorizator = ACLFileParser.parse(aclFile);
                } catch (ParseException pex) {
                    LOG.error(String.format("Format error in parsing acl file %s", aclFile), pex);
                }
                LOG.info("Using acl file defined at path {}", aclFilePath);
            } else {
                authorizator = new PermitAllAuthorizator();
                LOG.info("Starting without ACL definition");
            }

        }

        boolean allowAnonymous = Boolean.parseBoolean(props.getProperty(ALLOW_ANONYMOUS_PROPERTY_NAME, "true"));
        m_processor.init(subscriptions, messagesStore, sessionsStore, authenticator, allowAnonymous, authorizator, m_interceptor);
        return m_processor;
    }
#vulnerable code 
                                public ProtocolProcessor init(IConfig props) {
        subscriptions = new SubscriptionsStore();

        //TODO use a property to select the storage path
        m_mapStorage = new MapDBPersistentStore(props.getProperty(PERSISTENT_STORE_PROPERTY_NAME, ""));
        m_mapStorage.initStore();
        IMessagesStore messagesStore = m_mapStorage.messagesStore();
        ISessionsStore sessionsStore = m_mapStorage.sessionsStore(messagesStore);

        List<InterceptHandler> observers = new ArrayList<>();
        String interceptorClassName = props.getProperty("intercept.handler");
        if (interceptorClassName != null && !interceptorClassName.isEmpty()) {
            try {
                InterceptHandler handler = Class.forName(interceptorClassName).asSubclass(InterceptHandler.class).newInstance();
                observers.add(handler);
            } catch (Throwable ex) {
                LOG.error("Can't load the intercept handler {}", ex);
            }
        }
        m_interceptor = new BrokerInterceptor(observers);

        subscriptions.init(sessionsStore);

        String configPath = System.getProperty("moquette.path", null);
        String authenticatorClassName = props.getProperty(Constants.AUTHENTICATOR_CLASS_NAME, "");

        IAuthenticator authenticator = null;
        if (!authenticatorClassName.isEmpty()) {
            authenticator = (IAuthenticator)loadClass(authenticatorClassName, IAuthenticator.class);
            LOG.info("Loaded custom authenticator {}", authenticatorClassName);
        }

        if (authenticator == null) {
            String passwdPath = props.getProperty(PASSWORD_FILE_PROPERTY_NAME, "");
            if (passwdPath.isEmpty()) {
                authenticator = new AcceptAllAuthenticator();
            } else {
                authenticator = new FileAuthenticator(configPath, passwdPath);
            }
        }

        IAuthorizator authorizator = null;
        String authorizatorClassName = props.getProperty(Constants.AUTHORIZATOR_CLASS_NAME, "");
        if (!authorizatorClassName.isEmpty()) {
            authorizator = (IAuthorizator)loadClass(authorizatorClassName, IAuthorizator.class);
            LOG.info("Loaded custom authorizator {}", authorizatorClassName);
        }

        if (authorizator == null) {
            String aclFilePath = props.getProperty(ACL_FILE_PROPERTY_NAME, "");
            if (aclFilePath != null && !aclFilePath.isEmpty()) {
                authorizator = new DenyAllAuthorizator();
                File aclFile = new File(configPath, aclFilePath);
                try {
                    authorizator = ACLFileParser.parse(aclFile);
                } catch (ParseException pex) {
                    LOG.error(String.format("Format error in parsing acl file %s", aclFile), pex);
                }
                LOG.info("Using acl file defined at path {}", aclFilePath);
            } else {
                authorizator = new PermitAllAuthorizator();
                LOG.info("Starting without ACL definition");
            }

        }

        boolean allowAnonymous = Boolean.parseBoolean(props.getProperty(ALLOW_ANONYMOUS_PROPERTY_NAME, "true"));
        m_processor.init(subscriptions, messagesStore, sessionsStore, authenticator, allowAnonymous, authorizator, m_interceptor);
        return m_processor;
    } 
                            #location 28 
                            #vulnerability type NULL_DEREFERENCE