presto-spi/src/main/java/io/prestosql/spi/classloader/ThreadContextClassLoader.java/ThreadContextClassLoader/ThreadContextClassLoader
class ThreadContextClassLoader:    public ThreadContextClassLoader(ClassLoader newThreadContextClassLoader)
    {
        this.originalThreadContextClassLoader = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader(newThreadContextClassLoader);
    }