samples/boot/redis-json/src/main/java/sample/config/SessionConfig.java
private ObjectMapper objectMapper() {
		ObjectMapper mapper = new ObjectMapper();
		mapper.registerModules(SecurityJackson2Modules.getModules(this.loader));
		return mapper;
	}
private ObjectMapper objectMapper() {
		ObjectMapper mapper = new ObjectMapper();
		mapper.registerModules(SecurityJackson2Modules.getModules(this.loader));
		return mapper;
	}
Customized {@link ObjectMapper} to add mix-in for class that doesn't have default
constructors

@return the {@link ObjectMapper} to use