tomcat中class加载顺序

liuyuehua

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

• Bootstrap classes of your JVM
  
• System class loader classes (described above)
  
• /WEB-INF/classes of your web application
  
• /WEB-INF/lib/*.jar of your web application
  
• Common class loader classes (described above)
  

　　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.