sequence-generator | 比oracle sequence更加强大的序列生成器

My bad. Forgot to uncomment below line in application.properties.

The counter object is incremented outside the 'synchronized' lock (very first line of the nextValue method invokes incrementAndGet).

If you have 20 threads, the AtomicInteger starts out at 0, and each thread calls, simultaneously: counter.incrementAndGet(), then afterwards the atomicinteger holds value 20. Guaranteed.

Whereas if you have 20 threads and they all do, simultaneously: int c = counter.get(); counter.set(c + 1); then after all is done, the atomicinteger might be 20. Or 5. or 18. or 1.

The reason is rather simple: 20 threads all run the .get() line, all see zero, 20 threads all calculate '0+1', which is 1, and then 20 threads all set, in turn, the atomic integer to 1. Or even: one thread sees 0, gets pre-empted, 19 other threads play nice, increment the atomicinteger nicely from 0 to 19, and then finally that original thread continues on, calculates '0+1', and sets the atomicinteger to it, bringing us back to '.. and after all that the value is 1'.

Here the synchronization helps, but given that incrementing is occurring outside, you can still get the problem of the one thread that is inside the synchronized block reading, say, '5', then another 3 threads hitting the incrementAndGet outside of the synchronized block, making it 8, and then the original thread also setting the atomicinteger back to 6, thus you have 'missed' an bunch of increments.

As the documentation of CosineEmbeddingLoss says:

Creates a criterion that measures the loss given two input tensors and a Tensor label with values 1 or -1.

In your scenario, you should always provide 1 as the Tensor label.

With xslt you can do this:

Thanks to Neil Stocktin the problem was that i tried to get superclass property from this child. (not working). solution will be add

As indicated in my comment, Envers does not interpret its schema from the existing database schema in any way. In fact, its entire mapping model production process is based on inspecting Hibernate ORM's boot-time mapping model, which you can find in org.hibernate.mapping.

This means that for things such as column lengths, they should be supplied as part of your mapping model via either annotations or in your XML mapping file in order for Envers to generate properties that use those same lengths or in some cases custom column definitions.

If you specify the lengths in your XML mapping file and regenerate the Envers schema, it should align itself very closely with your Hibernate entity schema.

UPDATE
The reason you don't see the column definitions being rendered in the Envers mappings is because your JPA ORM.XML file is invalid, it isn't following the schema definition and thus not only would Envers not be seeing your column definitions, neither would Hibernate.

Your mappings should be: