Tomcat：因为ClassLoader启动失败

Tomcat类加载机制解析

最新推荐文章于 2021-05-06 22:35:58 发布

原创最新推荐文章于 2021-05-06 22:35:58 发布 · 289 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#tomcat

java 专栏收录该内容

4 篇文章

订阅专栏

本文详细解析了Tomcat中Web应用程序类加载器的工作原理，包括其如何偏离默认的Java委托模型，以及类加载的顺序。特别强调了不同配置下类路径的搜索顺序变化。

As mentioned above, the web application class loader diverges from the default Java delegation model (in accordance with the recommendations in the Servlet Specification, version 2.4, section 9.7.2 Web Application Classloader). When a request to load a class from the web application's WebappX class loader is processed, this class loader will look in the local repositories first, instead of delegating before looking. There are exceptions. Classes which are part of the JRE base classes cannot be overridden. For some classes (such as the XML parser components in J2SE 1.4+), the J2SE 1.4 endorsed feature can be used. Last, any JAR file that contains Servlet API classes will be explicitly ignored by the classloader — Do not include such JARs in your web application. All other class loaders in Tomcat follow the usual delegation pattern.

Therefore, from the perspective of a web application, class or resource loading looks in the following repositories, in this order: