我有一份载有<条码>的简便档案。
public class A {}
接着,我装上了它。
var classLoader = new URLClassLoader(Array(my_jar_file.toURI.toURL))
var clazz = classLoader.loadClass("A")
它可以装上<代码> A。 这一指挥也是ok的:
clazz.newInstance
但是,当我投了<条码>。 A:
clazz.newInstance.asInstanceOf[A]
我得出这一错误:
java.lang.ClassCastException: A cannot be cast to A
您能否帮助我?
你的守则意味着,在你称之为“la”的某一类Loader环境中,你有“A”,这是你从哪里获得烟雾物体的单独背景。 问题是,在两种不同的低温环境下,你有两种不同的“A”类。 从一个版本的“A”类中产生的物体不能归入另一个版本的不同类别“Loader”类。
I experienced a very similar problem, in that I observed a ClassCastException when casting a dynamically loaded object to an interface implemented by it.
Thanks to Neil s answer, I was able to determine that the ClassCastException was caused by having different class loader contexts.
为确定这一点,我使用了<代码>URLClassLoader(URL[] urls, LevelLoader parent)的构造者,而不是URLClassLoader(URL[] urls)的构造者。
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