Aurimas Niekis ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-16772 ( https://hibernate.atlassian.net/browse/HHH-16772?atlOrigin=eyJpIjoiOWM5NW... ) Re: Generated bytecode for HibernateAccessOptimizer class is invalid and causes operand stack overflow issue. ( https://hibernate.atlassian.net/browse/HHH-16772?atlOrigin=eyJpIjoiOWM5NW... ) I think I found the issue. The operand stack size is wrong on SetFieldOnArgument::apply method here https://github.com/hibernate/hibernate-orm/blob/6.2/hibernate-core/src/ma... I tried to reproduce the bytecode from plain java and noticed that operand stack size 3 and in code it's 2, but I am not sure if it's correct for the case when the setter is a method and not field like in my case. // access flags 0x9 public static set_timestamp(Lcom/example/bytebuddyhibernatebytecodereproduce/entity/EventStorageEntity;J)V L0 LINENUMBER 8 L0 ALOAD 0 LLOAD 1 PUTFIELD com/example/bytebuddyhibernatebytecodereproduce/entity/EventStorageEntity.timestamp : J L1 LINENUMBER 9 L1 RETURN L2 LOCALVARIABLE var0 Lcom/example/bytebuddyhibernatebytecodereproduce/entity/EventStorageEntity; L0 L2 0 LOCALVARIABLE var1 J L0 L2 1 MAXSTACK = 3 MAXLOCALS = 3 ( https://hibernate.atlassian.net/browse/HHH-16772#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16772#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100225- sha1:62413c2 )