简体繁体 English

用Javassist编译的类的类路径

[英]Classpath of classes compiled with Javassist

原文 2010-08-18 14:56:25 3 1 java/ javac/ bytecode/ java-compiler-api/ javassist

As the title suggests, what is the classpath of classes compiled with Javassist? 顾名思义，用Javassist编译的类的类路径是什么？

My scenario is: Class A is compiled with Javassist. 我的情况是：A类是使用Javassist编译的。 Class B is compiled with Java Compiler API and references Class A. The problem is that Class A is not visible to Class B... 类B是使用Java Compiler API编译的，并引用了类A。问题是类B对类B不可见。

Any ideas? 有任何想法吗？

1 个解决方案

The "classpath" of class B does not depends on how the class is compiled (eg the class file is created), but how the class is loaded. 类B的“类路径”不取决于如何编译类（例如，创建类文件），而是取决于类的加载方式。

Java uses the class loader of a class to look up also all classes which are referenced by this class. Java使用类的类加载器来查找该类引用的所有类。

Each class loader can have a parent class loader, and normally loader.loadClass first asks its parent class loader about any classes, and in case of failure tries to load the class itself. 每个类加载器可以有一个父类加载器，通常loader.loadClass首先向其父类加载器询问任何类，并在失败的情况下尝试加载类本身。

Thus, simply make sure the A class is visible to the class loader of class B, meaning that the class loader of A must be a parent (or parent of parent, or ...) of the class loader of class B . 因此，只要确保A类是B类的类加载器可见，这意味着的类加载器A必须是类的类加载器的父（或父的家长，或......） B 。