getstatic -c选项如何指定启动类加载器？

[lizongwu]

启动类加载器的hashcode为null，通过类名BootstrapClassloader也不行，怎么才能指定启动类加载器？

[sheikmca]

In Java, the Bootstrap ClassLoader (also known as the startup class loader) is special:

Its representation in Java is null, and it has no specific instance or hashcode. You cannot directly reference it by a class or instance name (e.g., no BootstrapClassLoader.class). ⚠️ Your Issue Clearly Explained: You mentioned:

The hashcode of the startup (bootstrap) class loader returns null. Specifying it explicitly using a class name (BootstrapClassLoader) does not work. This behaviour is normal because Java's BootstrapClassLoader is represented internally as null. You can't reference it by class name directly.

How to explicitly specify the Bootstrap ClassLoader: When you need to explicitly specify the bootstrap class loader in methods (like reflection APIs), use:

ClassLoader bootstrapClassLoader = null;

Example clearly (for class loading explicitly from bootstrap loader):

Class<?> clazz = Class.forName("java.lang.String", true, null); // null explicitly indicates bootstrap loader

Here, passing null explicitly instructs Java to use the Bootstrap ClassLoader.

Quick Summary (Simply): The bootstrap class loader in Java is represented by null. Explicitly specify the bootstrap loader as null.