How to send a message to errorChannel when an exception occurs in spring integration?

Hi I have an spring integration flow where my message traverse through multiple Deserialization, transformation and serialization process.

I am unable to handle any exception that are thrown during the process. I have defined my error channel as below. How to interrupt the integration flow and send the message to error channel? ================ error channel ===============

    @Bean("errorChannel")
    public MessageChannel errorChannel() {
        return new DirectChannel();
    }
    @Bean
    @Router(inputChannel = "errorChannel")
    public ErrorMessageExceptionTypeRouter handleError(){
        ErrorMessageExceptionTypeRouter router = new ErrorMessageExceptionTypeRouter();
        Map<String, String> mappings = new HashMap<>();
        mappings.put(RuntimeException.class.getName(), "someChannel");
        mappings.put(Exception.class.getName(), "someChannel");
        router.setChannelMappings(mappings);
        return router;
    }
    @ServiceActivator(inputChannel = "someChannel")
    public void handleErrors(Message<?> message)  {
        LOGGER.info(" error caught in some channel {}", message);
    }

============== error emitting channel ====================

    @Bean
    @ServiceActivator(inputChannel = "JSON_to_IM_in_Process")
    public AbstractReplyProducingMessageHandler  json_to_im_svc() throws Exception {

    AbstractReplyProducingMessageHandler  mh =  new AbstractReplyProducingMessageHandler () {
            
    @Override
    public Message<?>  handleRequestMessage(Message<?> inputMessage) {
            
        String inputRecord = inputMessage.getPayload().toString();
        Map<String, Object> newheader = new HashMap<String, Object>();
        InputModel result = null; 
******if(true) throw new RuntimeException("forcefully Exception ");******
        try {
            ObjectMapper mapper = new ObjectMapper();
            result = mapper.readValue(inputRecord, InputModel.class);
            newheader.put("Exception_Status", "Passed");
            Message<?> outMsg = MessageBuilder.withPayload(result).copyHeaders(inputMessage.getHeaders())
                    .copyHeaders(newheader).build();

            LOGGER.info("Deserialized to Input Model -------------->" + outMsg);
            return outMsg;
        } catch (Exception e) {
            newheader.put("Exception_Status", "Failed");
            String excep = "Exception in translating inputFormat to Object";
            Message<?> outMsg = MessageBuilder.withPayload(excep).copyHeaders(inputMessage.getHeaders())
                    .copyHeaders(newheader).build();
            LOGGER.info("Exception in translating inputFormat to Object", e.getMessage());
            return outMsg;
        }
    }

I want to catch the exception in the errorChannel but unable to do so. I want to break the integration flow from the exception I want to execute "someChannel" and stop and send to the outboundRequest channel. If the exception is inside the try{} block it is handled by the catch block. If the exception is outside the try block the stack trace is coming directly on the console.

What I need to do more to catch the exceptiopn in the errorChannel ?