public class ClassScanner
{
// scan extraClasspath for specific classes
public List<Class<?>> scanClasspathForClass(String scanCriteria)
{
...
}
public static Class<?> reloadClass(Class<?> clazz, ClassLoader clazzLoader)
{
// Question: how to reload a loaded class (ClassScanner in this example) with a different arbitrary ClassLoader?
}
// an example of how reloadClass() would be used
// in real case, this function would be in different class
public List<Class<?>> scan(URL[] extraClasspath)
{
URLClassLoader urlClazzLoader = new URLClassLoader(extraClasspath, null);
Class<?> newClass = reloadClass(ClassScanner.class, urlClazzLoader);
return ((ClassScanner) newClass.newInstance()).scanClasspathForClass();
}
}
上面的代码演示了问题以及它为什么是一个问题。我需要执行reloadClass()
。我想知道Java 1.6中是否有可靠的解决方案。一个有用的参考将是Find where java class is loaded from。如何在Java中使用不同的ClassLoader重载一个加载的类?
感谢您的帮助!
看到了吗? http://tutorials.jenkov.com/java-reflection/dynamic-class-loading-reloading.html#example – Nishant
谢谢。看见了。问题是,首先这个班可能来自任何地方。我怀疑'ClassLoader.getResource()'或'Class.getProtectionDomain()。getCodeSource()。getLocation()'是可靠的。其次,如果我可能要求简单的解决方案而不定义我的ClassLoader? –