StaleObjectstateException row was updated or deleted by

Question

I am getting this exception in a controller of a web application based on spring framework using hibernate. I have tried many ways to counter this but could not resolve it.<

Answer 1

Here are 3 possibilities (as I do not know exactly, which kind of hibernate session handling you are using). Add one after another and test:

Use bi-directional mapping with inverse=true between parent object and child object, so the change in parent or child will get propagate to the other end of relation properly.

Add support for Optimistic Locking using TimeStamp or Version column

Use join query to fetch the whole object graph [ parent+children] together to avoid the second call altogether.

Lastly, if and only if nothing works: Load the parent again by Id (you have that already) and populate modified data then update.

Life will be good! :)

Answer 2

This problem was something that I had experienced and was quite frustrating, although there has to be something a little odd going on in your DAO/Hibernate calls, because if you're doing a lookup by ID there is no reason to get a stale state, since that is just a simple lookup for an object.

First, make sure all your methods are annotated with @Transaction(required=true) // you'll have to look up the exact syntax

However, this exception is usually thrown when you try to make changes to an object that has been detached from the session it was retrieved from. The solution to this is often not simple and would require more code posted so we can see exactly what is going on; my general suggestion would be to create a @Service that performs these kinds of things within a single transaction

Answer 3

You're mis-using Hibernate in some way that causes it to think you're updating or deleting objects from the database.

That's why calling flush() is throwing an exception.

One possibility: you're incorrectly "sharing" Session or Entities, via member field(s) of your servlet or controller. This is the main reason 'synchronized' would change your error symptoms.. Short solution: don't ever do this. Sessions and Entities shouldn't & don't work this way -- each Request should get processed independently.

Another possibility: unsaved-value defaults to 0 for "int" PK fields. You may be able to type these as "Integer" instead, if you really want to use 0 as a valid PK value.

Third suggestion: use Hibernate Session explicitly, learn to write simple correct code that works, then load the Java source for Hibernate/ Spring libraries so you can read & understand what these libraries are actually doing for you.

Answer 4

I also have been struggling with this exception, but when it continued to recur even when I put a lock on the object (and in a test environment, where I knew I was the only process touching the object), I decided to give the parenthetical in the stack trace its due consideration.

org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.rc.model.mexp.MerchantAccount#59132]

In our case it turned out that the mapping was wrong; we had type="text" in the mapping for one field that was a mediumtext type in the database, and it seems that Hibernate really hates that, at least under certain circumstances. We removed the type specification altogether from the mapping for this field, and the problem was resolved.

Now the weird thing is that in our production environment, with the supposedly problematic mapping in place, we do NOT get this exception. Does anybody have any idea why this might be? We are using the same version of MySQL - "5.0.22-log" (I don't know what the "-log" means) - in dev and production envs.