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This is my entity class that is mapped to a table in
postgres
(9.4)
I am trying to store metadata as
jsonb
type in the database
@Entity
@Table(name = “room_categories”)
@TypeDef(name = “jsonb”, typeClass = JsonBinaryType.class)
public class RoomCategory extends AbstractEntity implements Serializable {
private String name;
private String code;
@Type(type = "jsonb")
@Column(columnDefinition = "json")
private Metadata metadata;
This is the metadata class:
public class Metadata implements Serializable {
private String field1;
private String field2;
I have used following migration file to add jsonb
column:
databaseChangeLog:
– changeSet:
id: addColumn_metadata-room_categories
author: arihant
changes:
– addColumn:
schemaName: public
tableName: room_categories
columns:
– column:
name: metadata
type: jsonb
I am getting this error while creating the record in postgres
:
ERROR: column “metadata” is of type jsonb
but expression is of type bytea
Hint: You will need to rewrite or cast the expression.
This is the request body i am trying to persist in db:
“name”: “Test102”,
“code”: “Code102”,
“metadata”: {
“field1”: “field11”,
“field2”: “field12”
Please help how to convert bytea
type to jsonb
in java spring boot app
–
Simply convert your object by an ObjectMapper to a json string and then use (::jsonb) as cast to jsonb type:
INSERT INTO room_categories (name, code, metadata)
VALUES (?, ?, ? ::jsonb );
(you will need to use native queries to query data stored as jsonb)
You could get this PostgreSQL:
ERROR: column “metadata” is of type jsonb but expression is of type bytea Hint: You will need to rewrite or cast the expression.
if you are executing a native SQL DML statement.
Native SQL DML statement
For instance, let's assume you want to do something like this:
int updateCount = entityManager.createNativeQuery("""
UPDATE
room_categories
metadata = :metadata
WHERE
code = :code AND
metadata ->> 'field1' is null
.setParameter("code ", "123-ABC")
.setParameter(
"metadata",
new Metadata()
.setField1("ABC")
.setField2("123")
.executeUpdate();
The bytea
type stands for byte array, and, since the Metadata
type implements the Serializable
interface, Hibernate falls back to using the SerializableType
when no other type is more appropriate.
But, since you cannot bind a byte array to a jsonb
column, PostgreSQL throws the aforementioned error.
The fix
To fix it, we have to set the JsonBinaryType
explicitly using the Hibernate-specific setParameter
Query
method:
int updateCount = entityManager.createNativeQuery("""
UPDATE
room_categories
metadata = :metadata
WHERE
code = :code AND
metadata ->> 'field1' is null
.setParameter("code ", "123-ABC")
.unwrap(org.hibernate.query.Query.class)
.setParameter(
"metadata",
new Metadata()
.setField1("ABC")
.setField2("123"),
JsonBinaryType.INSTANCE
.executeUpdate();
First, we had to unwrap
the JPA Query
to a Hibernate org.hibernate.query.Query
and call the setParameter
method that takes a Hibernate Type instance.
Now, Hibernate will know that the metadata
parameter needs to be handled by the JsonBinaryType
, and not by the SerializableType
.
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