`Code generation error` on Unit tests generation for `@Entity`

[alisevych]

Description

Code generation error on Unit tests generation for @Entity

To Reproduce

1. Install IU UnitTestBot plugin built from main in IntelliJ IDEA 2023.2
2. Open spring-petclinic project
3. Generate Unit tests for Owner class with PetClinicApplication selected

Expected behavior

All the tests are expected to be generated correctly.

Actual behavior

Errors report is generated.
StackOverflowError is thrown from codegen (see utbot-engine-current.log)

Screenshots, logs

	///region Test suites for executable org.springframework.samples.petclinic.owner.Owner.toString

	///region Errors report for toString

	public void testToString_errors() {
		// Couldn't generate some tests. List of errors:
		//
		// 1 occurrences of:
		// <Throwable with empty message>

	}
	///endregion

	///endregion

utbot-engine-current-error.log

Environment

IntelliJ IDEA version - 2023.2 Ultimate
Project - Gradle
JDK - 17

[alisevych]

@EgorkaKulikov
The issue is not reproducing on the latest main: https://github.com/UnitTestBot/UTBotJava/actions/runs/5923401140
So closing as fixed with:

• Save already created mock model in models to variables cache #2532