A JavaEE application is deployed on Tomee v8.0.16, without using the spring framework. Eclipselink v2.7.13 is used as an ORM. The connection settings are specified in the server.xml file

<GlobalNamingResources>
<Resource name="testdb" auth="Container" type="javax.sql.DataSource"
    username="test" password="testPassord"
    url="jdbc:postgresql://localhost:5432/postgres"
    driverClassName=".postgresql.Driver"
    initialSize="5"
    maxWaitMillis="1200000"
    maxTotal="120" 
    maxIdle="10"
    validationQuery="select 1"
    removeAbandonedTimeout="120"
    removeAbandonedOnBorrow="true"
    logAbandoned="true"
/>
</GlobalNamingResources>

When creating obj1, a transaction is opened and perform persist.

utx.begin();
em.persist(obj1)

A second obj2 is created by a foreign key linked to obj1. All fields are filled in it except for one required one, in order to cause an exception. Similarly perform persist.

em.persist(obj1)

and finally make a commit

utxmit();

Accordingly, an exception occurs, rollback is done. Ideally, both objects should fall under rollback and not be saved in the database, but for some reason obj1 was saved in the database.

PS: Initially, the application was deployed in weblogic and there were no such problems. Maybe there are some additional settings in tomcat?