code: private void preInitializeLeakyClasses() {
  		try {
  			Class<?> readerClass = ClassNameReader.class;
  			Field field = readerClass.getDeclaredField("EARLY_EXIT");
  			field.setAccessible(true);
  			((Throwable) field.get(null)).fillInStackTrace();
  		}
  		catch (Exception ex) {
  			this.logger.warn("Unable to pre-initialize classes", ex);
  		}
  	}
docs: CGLIB has a private exception field which needs to initialized early to ensure that
  the stacktrace doesn't retain a reference to the RestartClassLoader.