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'

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    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'
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    Root Cause Analysis

    1. 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()
    2. Jackson
      SimpleModule.addSerializer
      1. com.fasterxml.jackson.databind.module.SimpleSerializers.addSerializer(SimpleSerializers.java:80)
      2. com.fasterxml.jackson.databind.module.SimpleModule.addSerializer(SimpleModule.java:240)
      2 frames