JsonType

JsonType.java

public class JsonType implements UserType<Object>, DynamicParameterizedType {

    private final MutabilityPlan<Object> mutabilityPlan;
    private final ObjectMapper objectMapper = new ObjectMapper();
    private Type propertyType;
    private Class<?> propertyClass;

    public JsonType() {
        this.mutabilityPlan = new MutableMutabilityPlan<>() {
            @Override
            protected Object deepCopyNotNull(Object value) {
                return ObjectUtil.clone(value);
            }
        };
    }

    public String getName() {
        return "json";
    }

    @Override
    public boolean equals(Object first, Object second) {
        return ObjectUtil.equals(first, second);
    }

    @Override
    public int hashCode(Object object) {
        return object.hashCode();
    }

    @Override
    public Object nullSafeGet(ResultSet rs, int position, SharedSessionContractImplementor session, Object owner) throws
        SQLException {
        String json = rs.getString(position);
        if (json == null) {
            return null;
        }

        if (String.class.isAssignableFrom(propertyClass)) {
            return json;
        }
        try {
            return objectMapper.readValue(json, objectMapper.getTypeFactory().constructType(propertyType));
        } catch (JsonProcessingException exception) {
            LogUtil.error("Failed to deserialize json content from database", exception);
            throw new RuntimeException(exception);
        }
    }

    @Override
    public void nullSafeSet(PreparedStatement st, Object value, int index, SharedSessionContractImplementor session)
        throws HibernateException, SQLException {
        if (value == null) {
            st.setNull(index, getSqlType());
            return;
        }
        try {
            st.setObject(index, value instanceof String ? value : objectMapper.writeValueAsString(value), getSqlType());
        } catch (JsonProcessingException exception) {
            LogUtil.error("Failed to serialize json content to database", exception);
            throw new RuntimeException(exception);
        }
    }

    @Override
    public Object deepCopy(Object value) {
        return this.mutabilityPlan.deepCopy(value);
    }

    @Override
    public boolean isMutable() {
        return this.mutabilityPlan.isMutable();
    }

    @Override
    public Serializable disassemble(Object value) {
        return this.mutabilityPlan.disassemble(value, null);
    }

    @Override
    public Object assemble(Serializable cached, Object owner) {
        return this.mutabilityPlan.assemble(cached, null);
    }

    @Override
    public int getSqlType() {
        return Types.OTHER;
    }

    @Override
    public Class<Object> returnedClass() {
        return Object.class;
    }

    @Override
    public void setParameterValues(Properties parameters) {
        final XProperty xProperty = (XProperty) parameters.get(XPROPERTY);
        this.propertyType = ((JavaXMember) xProperty).getJavaType();
        this.propertyClass = (Class<?>) ((ParameterizedType) propertyType).getRawType();
    }
}

use it like this in entity field

@Type(value = JsonType.class)
@Column(columnDefinition = "json")
private Map<ConfigurationKey, Object> configuration = new HashMap<>();