如果是这样，你该怎么做？。
是的，听起来像是我的最后一个问题。本质上也是同样的问题。我有一个@javax.servlet.annotation.WebFilter，当直接打包到war中时，它可以很好地工作。现在我想将过滤器移到库中。但如果我这样做，就不会再叫它了。
我有什么需要注意的陷阱吗？还是根本不可能？
设置<；web应用元数据完成=“false”>。
这意味着此web应用程序的元数据不限于此特定的xml（以及web应用程序中的类），而是可以由第三方库使用元数据。
还可以看看“网络碎片”。您可以在jar的META-INF中定义web片段.xml，并在那里映射所有servlet和过滤器。
只需在JAR项目的/META-INF文件夹中放入一个与web.xml兼容的空Servlet 3.0文件。
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="yourProjectId" version="3.0">
</web-app>
Servlet 3.0容器默认情况下会扫描JAR中是否存在/META-INF/web.xml文件，然后扫描JAR中的所有类中是否存在Servlet 3.0注释。不需要其他设置。
JSF 2.0在/META-INF/faces-config.xml中也有类似的技术。
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