Row is always updated when using JSON objects wrapped in POJOs with no explicit equals method

Hello,

I am using PostgreSQL database and have a table with some jsonb data. I am using JsonBinaryType from hibernate-types-52 to map jsonb to POJO property in my entity.

@Entity
@TypeDef(name = "jsonb", typeClass = JsonBinaryType.class)
public class InstrumentEntity{
    ....
    @Type(type = "jsonb")
    @Column(name = "instrument_configuration", columnDefinition = "jsonb")
    private InstrumentConfiguration configuration;
    ....
}

My problem is the following, even when I am only trying to fetch (read) the entity from the database and don’t update anything in it, when my transaction finishes, hibernate performs a row update! I know this because I see it in PostgreSQL log. This is really unexpected and causes performance regression and even deadlocks in my application.

How to avoid performing row updates when I only want to fetch the data? If no JsonBinaryType is used, row is only updated if I update the entity, as expected.

[vladmihalcea]

I managed to replicate it and this commit fixes the issue. This fix will be included in 2.9.7, but I will wait for one or two more fixes or improvements to release that.

You should give it a try and see if it works for you too. You can build the hibernate-types-52 without running the tests and use the 2.9.7-SNAPSHOT artifact to validate the fix.

[vladmihalcea]

I’m glad I could help