private Class<?> injectClass0(String className) throws IllegalArgumentException, ClassNotFoundException {
        appendToBootstrapClassLoaderSearch();
        return Class.forName(className, false, null);
    }
@author Woonduk Kang(emeroad)
@author jaehong.kim
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/instrument/classloading/BootstrapClassLoaderHandler.java