java – JSF如何找到用@ManagedBean注释的bean？

My question is how does JSF implementation find all classes annotated with @ManagedBean? Does it scan all of the classes in the class path? Or is there a way to actually “query” the JVM for the annotated classes?

从 Mojarra 年的 com.sun.faces.application.annotation.AnnotationManager 年开始.请注意,这不是API的一部分,而是实现特定的.

如果您打算为自己的项目使用这些工具,我建议您使用 Reflections 而不是自己的项目.

Set<Class<?>> classes = reflections.getTypesAnnotatedWith(SomeAnnotation.class);

在Java EE环境中,更好的是使用CDI.

I’m asking this because when I put my annotated backing beans in my web project directly, there’s no problem. But the beans that I define in the JAR files (to be reusable across projects) are not registered. Is there something that I have to tell MyFaces to direct it which JAR files to look at?

要使JSF从JAR文件加载任何带注释的托管bean,必须将/META-INF/faces-config.xml文件放在JAR文件中.只是一个JSF 2.0兼容<faces-config>声明足以使JSF扫描JAR文件以获取任何有趣的注释类.如果/META-INF/faces-config.xml文件不存在于JAR文件中,则JSF将不会扫描JAR文件以提高加载性能.

以下是与JSF 2.0兼容的最少的faces-config.xml文件如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">
</faces-config>

将其存储在JAR的META-INF文件夹中.

这是按照 JSF 2.0 specification 第11.4.2章的描述.

也可以看看：

> Structure for multiple JSF projects with shared code