Hi,

it happens quite frequently that I’m contacted internally that our fat JARs are too large and consume too much storage, bandwidth etc. in our entire ecosystem. (In total obviously. A single fat JAR is not too large, but hundreds of builds accumulate after all)

One - if not THE - top consumer in our fat JARs was and still is Hibernate. It’s a whopping 7MB large on 5.6.x and 6.1.x hasn’t really made it better. On the contrary, 6.1.x is at 9MB already.

In typical Spring-Boot apps of us, this is the TOP 10 of external libraries.

7,1M	hibernate-core-5.6.10.Final.jar
5,4M	scala-library-2.13.0.jar
4,1M	modelmapper-3.1.0.jar
3,7M	byte-buddy-1.12.13.jar
3,5M	swagger-ui-4.11.1.jar
2,6M	guava-30.1.1-android.jar
2,3M	undertow-core-2.2.19.Final.jar
2,1M	commons-math3-3.6.1.jar
2,0M	spring-data-redis-2.7.2.jar
2,0M	aspectjweaver-1.9.7.jar

As you can see Hibernate takes the top position here. With Hibernate 6 even by a larger margin.

Is there anything you can do to reduce this? E.g. is hibernate-core really core enough or is containing too much stuff the average user doesn’t need 99% of the times?

Cheers,

Christoph