tomcat中class加载顺序
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.
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