Hibernate error null value in column id violates not-null constraint

Since this sounds like identity generator, I've chosen that. As an aside, when I tried to use the sequence generator, I got another error. I can visit that in another post if necessary.

Picking one issue at a time. For some reason, it appears that hibernate is trying to insert null for the id on a new object that needs to be persisted for the first time. However, I've read the documentation and it seems as if Hibernate is supposed to handle all this automatically. I've read Java Persistence with Hibernate and it says this in Section The hibernate docs also repeat this, explaining that unsaved-value attribute on ids should rarely have to be used anymore since hibernate does the detection on its own.

I also checked out dynamicInsert on the class but it doesn't help either. I've also set unsaved-value to null but this doesn't coerce hibernate into the right behavior either. I'm missing something Thank you all. This method will return all free listings for a specific timeframe. When I execute this on the DB directly, the time of execution is about ms. I have run multiple tests, and results are very close to the values I just described.

I am trying to understand where the 10x increase is coming from. I am sure that converting the query to the correct instances might be quite "heavy", but it seems to me that it is not the only issue.

The Hikari configuration for this connection is as follows:. Could it be that all the OneToMany relationships are also fetched and therefore need to be converted? Or is there some test I might be able to run to understand where the time is lost?

Today I added images to my database on the heroku admin page. When I refreshed the Website, the page looked fine. But then when I did "git push heroku master" without making any changes in my current project, the content of my website got corrupted. I am working on rest api.

I got error while delete data by id. All code is complete but don't know why postman fire error. I can map two table with unidirectional mapping using hibernate. Integer ". It is like chain of A an B many of them. I am learning hibernate and table relationship. Obviously I misunderstand something.

Also when I load B, I can access related A. How can I achieve this goal? Initialising through commandlinerunner worked. The log does not show the command being executed. No more boring flashcards learning! Learn languages, math, history, economics, chemistry and more with free Studylib Extension! Add to Chrome It's free. Another workaround is to manually initialize dateCreated on object instantiation, i.

I've been debugging this issue and tried different databases and hibernate versions 5. The problem only happens with Postgresql.

I've tried with both H2 and Mysql and it works correctly. The issue is when binding the parameters for the update. On both H2 and Mysql the log looks like this:. As you can see the timestamp field is set to null during the update, so somewhere that value is lost. As James suggested maybe the issue is in the postgresql driver. I've also updated it to the latest version I've also though that maybe this issue was because of the isolation level. Postgresql default isolation level is "read committed" and Mysql is "repeteable read".

I've done a few tests changing the level for both postgres and mysql but in all the cases it still works in mysql and it still fails in postgres. I've been debugging and comparing the execution of Mysql and Postgres until I've found the problem.

The bad news is that this is how Hibernate and Postgres work:. When executing source. The method insert. This sets the value in the dateCreated field and from here the value is available during the update that fails in postgresql. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.

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