javajsonpostgresqljpaeclipselink

How to use Postgres JSONB datatype with JPA?


Im not finding a way to map the JSON and JSONB datatypes from PostgreSQL using JPA (EclipseLink). Is some one using this datatypes with JPA and can give me some working examples?


Solution

  • All the answers helped me to reach the final solution that is ready for JPA and not EclipseLink or Hibernate specifically.

    import com.fasterxml.jackson.core.type.TypeReference;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import java.io.IOException;
    import javax.json.Json;
    import javax.json.JsonObject;
    import javax.persistence.Converter;
    import org.postgresql.util.PGobject;
    
    @Converter(autoApply = true)
    public class JsonConverter implements javax.persistence.AttributeConverter<JsonObject, Object> {
    
      private static final long serialVersionUID = 1L;
      private static ObjectMapper mapper = new ObjectMapper();
    
      @Override
      public Object convertToDatabaseColumn(JsonObject objectValue) {
        try {
          PGobject out = new PGobject();
          out.setType("json");
          out.setValue(objectValue.toString());
          return out;
        } catch (Exception e) {
          throw new IllegalArgumentException("Unable to serialize to json field ", e);
        }
      }
    
      @Override
      public JsonObject convertToEntityAttribute(Object dataValue) {
        try {
          if (dataValue instanceof PGobject && ((PGobject) dataValue).getType().equals("json")) {
            return mapper.reader(new TypeReference<JsonObject>() {
            }).readValue(((PGobject) dataValue).getValue());
          }
          return Json.createObjectBuilder().build();
        } catch (IOException e) {
          throw new IllegalArgumentException("Unable to deserialize to json field ", e);
        }
      }
    }