JarFileWrapper may cause many FinalReferences causing GC pressure #28042
Description
Environment：spring boot 2.5.4 + jdk8
Create a bean to continue load class which could not be found,than use java -jar start springboot fatjar
@Component
public class TestClass implements InitializingBean {
@Override
public void afterPropertiesSet() throws Exception {
new Thread(() -> {
while (true) {
try {
Class.forName("com.test.error.NotClassFound");
} catch (ClassNotFoundException e) {
//ignore
}
}
}).start();
}
}
many org.springframework.boot.loader.jar.JarFileWrapper will be create which increase FinalReference time in gc:
when update spring boot version to 2.1.13，it's ok：
In normal it will not happen because LaunchedURLClassLoader has package cache，but it will happen when so bug trigger many nonexistent class load.