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    java.lang.UnsupportedOperationException: Can not create generator for character-based (not byte-based) target
        at com.fasterxml.jackson.dataformat.avro.AvroFactory._nonByteTarget(AvroFactory.java:384)
        at com.fasterxml.jackson.dataformat.avro.AvroFactory._createGenerator(AvroFactory.java:355)
        at com.fasterxml.jackson.core.JsonFactory.createGenerator(JsonFactory.java:1051)
        at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:2323)
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