为什么 Tomcat 使用反射来实现 Catalina 实例化

Question

阅读Tomcat 7源码，我只是想知道为什么Tomcat实例Catalina并通过反射调用相关方法而不是简单地使用new创建对象并直接调用方法？

Answer 1

答案在 Bootstrap 类的 javadoc 注释中：

/**
 * Bootstrap loader for Catalina.  This application constructs a class loader
 * for use in loading the Catalina internal classes (by accumulating all of the
 * JAR files found in the "server" directory under "catalina.home"), and
 * starts the regular execution of the container.  The purpose of this
 * roundabout approach is to keep the Catalina internal classes (and any
 * other classes they depend on, such as an XML parser) out of the system
 * class path and therefore not visible to application level classes.
 *
 * @author Craig R. McClanahan
 * @author Remy Maucherat
 * @version $Id: Bootstrap.java 1142323 2011-07-02 21:57:12Z markt $
 */

public final class Bootstrap { ... }