spring boot - no String-argument constructor/factory method to deserialize from String value ('yyyy-MM-dd')

Spring boot - no String-argument constructor/factory method to deserialize from String value ('yyyy-MM-dd')

The error message "no String-argument constructor/factory method to deserialize from String value" in Spring Boot typically occurs when Jackson, the default JSON serializer and deserializer, encounters a class that it cannot deserialize from a string because it lacks a suitable constructor or factory method.

To resolve this issue, you can consider the following solutions:

  1. Add a Constructor or Factory Method: Ensure that the class being deserialized has a constructor or factory method that can accept a String argument. For example, if the class is a custom date format, you might need to add a constructor that accepts a String argument and parses it.

    public class CustomDateFormat { private String pattern; public CustomDateFormat(String pattern) { this.pattern = pattern; } // Add getters and setters }

  2. Use @JsonCreator Annotation: If you have control over the class, you can use the @JsonCreator annotation on a static factory method that takes a String argument.

    import com.fasterxml.jackson.annotation.JsonCreator; public class CustomDateFormat { private String pattern; @JsonCreator public static CustomDateFormat fromString(String pattern) { return new CustomDateFormat(pattern); } // Add getters and setters }

  3. Custom Deserialization: Implement a custom deserializer for the class using Jackson's JsonDeserializer. This allows you to define the logic for deserialization.

    import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.databind.DeserializationContext; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.deser.std.StdDeserializer; public class CustomDateFormatDeserializer extends StdDeserializer<CustomDateFormat> { protected CustomDateFormatDeserializer() { super(CustomDateFormat.class); } @Override public CustomDateFormat deserialize(JsonParser p, DeserializationContext ctxt) { JsonNode node = p.readValueAsTree(); String pattern = node.asText(); return new CustomDateFormat(pattern); } }

    Register the deserializer in your application configuration:

    import com.fasterxml.jackson.databind.module.SimpleModule; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class JacksonConfig { @Bean public SimpleModule customDateFormatModule() { SimpleModule module = new SimpleModule(); module.addDeserializer(CustomDateFormat.class, new CustomDateFormatDeserializer()); return module; } }

    Make sure to replace CustomDateFormat with the actual class you are working with.

Examples

  1. "Spring Boot JSON deserialization error no String-argument constructor"

    • Code Implementation:
      @NoArgsConstructor @AllArgsConstructor @Data public class MyEntity { @JsonFormat(pattern = "yyyy-MM-dd") private Date myDate; }

  2. "Spring Boot Jackson custom date format for JSON"

    • Code Implementation:
      @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd", timezone = "UTC") private Date myDate;

  3. "Jackson ObjectMapper configure date format Spring Boot"

    • Code Implementation:
      @Bean public Jackson2ObjectMapperBuilder objectMapperBuilder() { Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder(); builder.simpleDateFormat("yyyy-MM-dd"); return builder; }

  4. "Spring Boot JSON date format not working"

    • Code Implementation:
      @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd", timezone = "UTC") private LocalDate myDate;

  5. "Spring Boot Jackson custom date serializer"

    • Code Implementation:
      public class CustomDateSerializer extends JsonSerializer<Date> { @Override public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException { SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); String formattedDate = formatter.format(date); gen.writeString(formattedDate); } }

  6. "Spring Boot handle date format in JSON request"

    • Code Implementation:
      @JsonFormat(pattern = "yyyy-MM-dd") private LocalDate myDate;

  7. "Jackson ObjectMapper set date format globally"

    • Code Implementation:
      @Configuration public class JacksonConfig { @Bean public Jackson2ObjectMapperBuilder objectMapperBuilder() { Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder(); builder.dateFormat(new SimpleDateFormat("yyyy-MM-dd")); return builder; } }

  8. "Spring Boot JSON date format annotation"

    • Code Implementation:
      @JsonFormat(pattern = "yyyy-MM-dd", timezone = "UTC") private Date myDate;

  9. "Spring Boot Jackson date deserialization error"

    • Code Implementation:
      @JsonDeserialize(using = CustomDateDeserializer.class) private Date myDate;

  10. "Jackson deserialize date without default constructor Spring Boot"

    • Code Implementation:
      @JsonCreator public MyEntity(@JsonProperty("myDate") @JsonFormat(pattern = "yyyy-MM-dd") Date myDate) { this.myDate = myDate; }

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