I use in application MySQL 5.7 and I have JSON columns. When I try running my integration tests don't work because the H2 database can't create the table. This is the error:
2016-09-21 16:35:29.729 ERROR 10981 --- [ main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000389: Unsuccessful: create table payment_transaction (id bigint generated by default as identity, creation_date timestamp not null, payload json, period integer, public_id varchar(255) not null, state varchar(255) not null, subscription_id_zuora varchar(255), type varchar(255) not null, user_id bigint not null, primary key (id))
2016-09-21 16:35:29.730 ERROR 10981 --- [ main] org.hibernate.tool.hbm2ddl.SchemaExport : Unknown data type: "JSON"; SQL statement:
This is the entity class.
@Table(name = "payment_transaction")
public class PaymentTransaction extends DomainObject implements Serializable {
@Convert(converter = JpaPayloadConverter.class)
@Column(name = "payload", insertable = true, updatable = true, nullable = true, columnDefinition = "json")
private Payload payload;
public Payload getPayload() {
return payload;
}
public void setPayload(Payload payload) {
this.payload = payload;
}
}
And the subclass:
public class Payload implements Serializable {
private Long userId;
private SubscriptionType type;
private String paymentId;
private List<String> ratePlanId;
private Integer period;
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public SubscriptionType getType() {
return type;
}
public void setType(SubscriptionType type) {
this.type = type;
}
public String getPaymentId() {
return paymentId;
}
public void setPaymentId(String paymentId) {
this.paymentId = paymentId;
}
public List<String> getRatePlanId() {
return ratePlanId;
}
public void setRatePlanId(List<String> ratePlanId) {
this.ratePlanId = ratePlanId;
}
public Integer getPeriod() {
return period;
}
public void setPeriod(Integer period) {
this.period = period;
}
}
And this converter for insert in database:
public class JpaPayloadConverter implements AttributeConverter<Payload, String> {
// ObjectMapper is thread safe
private final static ObjectMapper objectMapper = new ObjectMapper();
private Logger log = LoggerFactory.getLogger(getClass());
@Override
public String convertToDatabaseColumn(Payload attribute) {
String jsonString = "";
try {
log.debug("Start convertToDatabaseColumn");
// convert list of POJO to json
jsonString = objectMapper.writeValueAsString(attribute);
log.debug("convertToDatabaseColumn" + jsonString);
} catch (JsonProcessingException ex) {
log.error(ex.getMessage());
}
return jsonString;
}
@Override
public Payload convertToEntityAttribute(String dbData) {
Payload payload = new Payload();
try {
log.debug("Start convertToEntityAttribute");
// convert json to list of POJO
payload = objectMapper.readValue(dbData, Payload.class);
log.debug("JsonDocumentsConverter.convertToDatabaseColumn" + payload);
} catch (IOException ex) {
log.error(ex.getMessage());
}
return payload;
}
}
I just came across this problem working with the JSONB
column type - the binary version of the JSON
type, which doesn't map to TEXT
.
For future reference, you can define a custom type in H2 using CREATE DOMAIN
, as follows:
CREATE domain IF NOT EXISTS jsonb AS other;
This seemed to work for me, and allowed me to successfully test my code against the entity.
Source: https://objectpartners.com/2015/05/26/grails-postgresql-9-4-and-jsonb/