Contest Estimator dies when loading class

[Domonion]

Description

If .class in tested project references class which is not present in either project or provided dependencies .jars - when loading it for executing contest estimator throws exception and dies indefinitely.

To Reproduce

JDK8, Contest Estimator, fastjson-1.2.50.

Expected behavior

Contest Estimator works clean.

Actual behavior

An error is thrown and Contest Estimator hangs indefinitely:

java.lang.NoClassDefFoundError: org/springframework/http/converter/GenericHttpMessageConverter
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_352]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:756) ~[?:1.8.0_352]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_352]
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:473) ~[?:1.8.0_352]
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74) ~[?:1.8.0_352]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369) ~[?:1.8.0_352]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363) ~[?:1.8.0_352]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_352]
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362) ~[?:1.8.0_352]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_352]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_352]
	at org.utbot.contest.ContestEstimatorKt.runEstimator(ContestEstimator.kt:451) [main/:?]
	at org.utbot.contest.ContestEstimatorKt.main(ContestEstimator.kt:342) [main/:?]
Caused by: java.lang.ClassNotFoundException: org.springframework.http.converter.GenericHttpMessageConverter
	at java.net.URLClassLoader.findClass(URLClassLoader.java:387) ~[?:1.8.0_352]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_352]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_352]
	... 13 more

Additional context

Before this exception warning is shown:

14:08:10.439 | WARN  | Smoke test failed for class: com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter

This may be related to #1700 - may be not all spring is bundled in .jar.