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JsonSerializer of type CustomSerializer does not define valid handledType() -- must either register with method that takes type argument or make serializer extend 'com.fasterxml.jackson.databind.ser.std.StdSerializer'
java.lang.IllegalArgumentException: JsonSerializer of type CustomSerializer does not define valid handledType() -- must either register with method that takes type argument  or make serializer extend 'com.fasterxml.jackson.databind.ser.std.StdSerializer'	at com.fasterxml.jackson.databind.module.SimpleSerializers.addSerializer(SimpleSerializers.java:80)	at com.fasterxml.jackson.databind.module.SimpleModule.addSerializer(SimpleModule.java:240)