Unable to get original string message send from third party system - spring-boot

Question

When getting message from third part system using MQ, it is displaying like bytes array instead of original string sent by third party system.
For example:
Original Json String sent bt third part system {"name":"sonoo","salary":600000.0,"age":27}
Received String from MQ is : 123,34,82,101,103,68,101,99,77,115,103,34,58,123,34,72,100,114,34,58,123,34,64,84,109,79,102,102,34,58,34,43,48,56,58,48,48,34,44,34,64,68,116,109,34,58,34,50,48,50,51,45,48,49,45,49,56
Expected result: {"name":"sonoo","salary":600000.0,"age":27}
#GenerateTransactionID
#JmsListener(destination = "${mq.queueName}", containerFactory = "${mq.containerFactory}", concurrency = "${mq.receiver.concurrency}")
public void receiveMessage(String jsonString) {
try
{
logger.debug(" Message received from third party::: " +jsonString);
if(jsonString.contains("RegDecMsg") && jsonString.contains("DocId")) {
Map<String, Object> jsonMap = dmgJsonParser.parseAsTree(jsonString);
StringBuilder sb = new StringBuilder();
printMapForDebugging(jsonMap, sb, jsonString);
logger.debug(" Attributes \n {}" +sb);
dmgJsonTraverser.processJsonNodes(jsonMap);
} else {
logger.debug(" Received message from third party is not in the expected format::: " +jsonString);
}
} catch (NullPointerException nx) {
logger.error(" Error while processing message:: "+ jsonString, " Please contact support!! ", nx);
} catch (Exception ex) {
logger.error(" Error while processing message:: "+ jsonString, " Please contact support!! ", ex);
throw ex;
}
}