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Asked: 2026-06-08T02:59:16+00:00

I’m fairly new to the JVM and ClassLoaders. I have these two classes: public

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I’m fairly new to the JVM and ClassLoaders. I have these two classes:

public abstract class CoreModule extends Entity

public final class EventManager extends CoreModule

At the start of the program, I create an instance of EventManager. So I understand that the JVM knows what Entity class is and how to load it (that is, it knows what ClassLoader to use), since EventManager is a grand-child. But when an Entity instance is passed by some serialization mechanism, it throws ClassNotFoundException. I have to manually set the ClassLoader to use (Event.class.getClassLoader()).

How come the JVM does not know what Event class is or how to load it if it already did it?

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1 Answer

  1. Editorial Team

    Actually the JVM does not figure this out “magically”.
    It is all based on a system class loader which will vary depending on the environment you use. Then each thread has a context ClassLoader which derives from this automatically.

    The context ClassLoader you can change by using Thread.setContextClassLoader

    If your serialization code should be able to resolve a class not visible from the context ClassLoader you need to set this the way you did.

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