加载我自己的Xalan实现，其中旧的Xalan被加载到父类加载器 [英] Load my own Xalan implementation where an older Xalan is loaded to the parent classloader

问题描述

我正在编写一个框架插件，将我的代码作为子类加载器加载

I'm writing a plugin for a framework that loads my code as a child classloader

问题是该框架使用某个Xerces版本，而不是与我的代码兼容，我想用我的自己的jar用于xerces，但似乎既然旧的已经加载了，我似乎无法使我的代码使用我的。

The problem is that that framework uses a certain Xerces version, that is not compatible with my code, I want to use my "own" jar for xerces, but it seems since the old one was already loaded, I can't seem to make my code use mine.

我正在寻找一些类加载器分离，我知道这是一个已知的问题，但似乎无法解决它

I'm looking for some classloader seperation, I know it's a know problem, but can't seem to solve it

在这种情况下，是否有任何框架，库或代码示例在本地用户使用较新的jar？

Is there any framework, library, or code sample to user locally a newer jar in such a scenario?

推荐答案

您是否尝试将框架和Xerces库的类作为ExtClassLoader的一部分加载到对应于java.ext.dirs系统属性的路径中？这样，框架的Xerces实现版本将由ExtClassLoader加载。

Have you tried loading the classes of your framework and Xerces libs as a part of the ExtClassLoader by placing them in path corresponding to the java.ext.dirs system property? This way the framework's version of Xerces implementation will be loaded by the ExtClassLoader.

然后，您可以将Xerces实现的版本放在与java.class.path对应的路径中由AppClassLoader加载的系统属性。

You can then place your version of Xerces implementation in the path corresponding to the java.class.path system property to be loaded by the AppClassLoader.

我自己没有尝试过，但考虑到类加载层次结构，这应该有效。您可以在此处了解有关类加载层次结构的更多信息 - http：// onjava.com/pub/a/onjava/2005/01/26/classloading.html

I have not tried this myself, but considering the class loading hierarchy this should work. You can learn more about the class loading hierarchy here - http://onjava.com/pub/a/onjava/2005/01/26/classloading.html

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