#vulnerable code 
                                @Test
    public void test() throws Exception {
        String channelName = "test" + System.currentTimeMillis();
        TestChannelGenerator channelGenerator = new TestChannelGenerator(testConfig, channelCreationToken);
        Conversation channel = channelGenerator.createNewPublicChannel(channelName);
        try {
            String channelId = channel.getId();

            // need to invite the bot user to the created channel before starting an RTM session
            inviteBotUser(channelId);

            RTMEventsDispatcher dispatcher = RTMEventsDispatcherFactory.getInstance();
            HelloHandler hello = new HelloHandler();
            dispatcher.register(hello);

            SubHelloHandler hello2 = new SubHelloHandler();
            dispatcher.register(hello2);

            dispatcher.register(new UserTypingHandler());

            SlackTestConfig testConfig = SlackTestConfig.getInstance();
            Slack slack = Slack.getInstance(testConfig.getConfig());

            try (RTMClient rtm = slack.rtmConnect(classicAppBotToken)) {
                rtm.addMessageHandler(dispatcher.toMessageHandler());

                rtm.connect();
                Thread.sleep(1000L);
                assertThat(hello.counter.get(), is(1));
                assertThat(hello2.counter.get(), is(1));

                rtm.reconnect();
                Thread.sleep(1000L);
                assertThat(hello.counter.get(), is(2));
                assertThat(hello2.counter.get(), is(2));

                dispatcher.deregister(hello);

                rtm.reconnect();
                Thread.sleep(1000L);
                assertThat(hello.counter.get(), is(2)); // should not be incremented
                assertThat(hello2.counter.get(), is(3));
            }

        } finally {
            channelGenerator.archiveChannel(channel);
        }
    } 
                            #location 24 
                            #vulnerability type RESOURCE_LEAK
#fixed code
                                @Test
    public void test() throws Exception {
        String channelName = "test" + System.currentTimeMillis();
        TestChannelGenerator channelGenerator = new TestChannelGenerator(testConfig, channelCreationToken);
        Conversation channel = channelGenerator.createNewPublicChannel(channelName);
        try {
            String channelId = channel.getId();

            // need to invite the bot user to the created channel before starting an RTM session
            inviteBotUser(channelId);

            RTMEventsDispatcher dispatcher = RTMEventsDispatcherFactory.getInstance();
            HelloHandler hello = new HelloHandler();
            dispatcher.register(hello);

            SubHelloHandler hello2 = new SubHelloHandler();
            dispatcher.register(hello2);

            dispatcher.register(new UserTypingHandler());

            SlackTestConfig testConfig = SlackTestConfig.getInstance();
            Slack slack = Slack.getInstance(testConfig.getConfig());

            try (RTMClient rtm = slack.rtmConnect(classicAppBotToken)) {
                rtm.addMessageHandler(dispatcher.toMessageHandler());

                rtm.connect();
                Thread.sleep(1000L);
                assertThat(hello.counter.get(), is(1));
                assertThat(hello2.counter.get(), is(1));

                BotMessageHandler bot = new BotMessageHandler();
                dispatcher.register(bot);

                ChatPostMessageResponse chatPostMessage = slack.methods(classicAppBotToken)
                        .chatPostMessage(r -> r.channel(channelId).text("Hi!"));
                assertThat(chatPostMessage.getError(), is(nullValue()));

                Thread.sleep(1000L);
                assertThat(bot.counter.get(), is(1));

                rtm.reconnect();
                Thread.sleep(1000L);
                assertThat(hello.counter.get(), is(2));
                assertThat(hello2.counter.get(), is(2));

                dispatcher.deregister(hello);

                rtm.reconnect();
                Thread.sleep(1000L);
                assertThat(hello.counter.get(), is(2)); // should not be incremented
                assertThat(hello2.counter.get(), is(3));

            }

        } finally {
            channelGenerator.archiveChannel(channel);
        }
    }