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[英]managed bean field is null when invoke bean method primefaces jsf
[英]CDI interceptor not fired when JSF managed bean method is invoked
这是我的拦截器研究案例,但没有成功。
拦截器注释
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.interceptor.InterceptorBinding;
@Inherited
@InterceptorBinding
@Retention(RUNTIME)
@Target({METHOD, TYPE})
public @interface LogInterceptor {
}
拦截器的实现
import javax.annotation.Priority;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;
@Interceptor
@LogInterceptor
@Priority(Interceptor.Priority.APPLICATION)
public class LogInterceptorImpl {
@AroundInvoke
public Object log(InvocationContext context) {
Object o = null;
try {
System.out.println("START");
o = context.proceed();
System.out.println("END");
} catch (Exception e) {
e.printStackTrace();
}
return o;
}
}
控制器
import modelo.Post;
import interceptor.LogInterceptor;
import java.io.Serializable;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean(name = "postController")
@SessionScoped
public class PostController implements Serializable {
private List<Post> items = null;
private Post selected;
public PostController() {
MyFacade facade = new MyFacade();
items = facade.getItems();
}
@LogInterceptor
public List<Post> getItems() {
return items;
}
}
玻璃鱼原木
Informações: EclipseLink, version: Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd
Informações: file:/C:/Users/f9921257/Documents/NetBeansProjects/estudo/build/web/WEB-INF/classes/_estudoPU login successful
Informações: Portable JNDI names for EJB PostFacade: [java:global/estudo/PostFacade!facade.PostFacade, java:global/estudo/PostFacade]
Informações: Portable JNDI names for EJB CategoriaFacade: [java:global/estudo/CategoriaFacade!facade.CategoriaFacade, java:global/estudo/CategoriaFacade]
Informações: WELD-000900: 2.2.2 (Final)
WARN: WELD-001700: Interceptor annotation class javax.ejb.PostActivate not found, interception based on it is not enabled
WARN: WELD-001700: Interceptor annotation class javax.ejb.PrePassivate not found, interception based on it is not enabled
WARN: WELD-000411: Observer method [BackedAnnotatedMethod] org.glassfish.sse.impl.ServerSentEventCdiExtension.processAnnotatedType(@Observes ProcessAnnotatedType<Object>, BeanManager) receives events for all annotated types. Consider restricting events using @WithAnnotations or a generic type with bounds.
WARN: WELD-000411: Observer method [BackedAnnotatedMethod] private org.glassfish.jersey.gf.cdi.internal.CdiComponentProvider.processAnnotatedType(@Observes ProcessAnnotatedType<Object>) receives events for all annotated types. Consider restricting events using @WithAnnotations or a generic type with bounds.
WARN: WELD-000411: Observer method [BackedAnnotatedMethod] public org.glassfish.jms.injection.JMSCDIExtension.processAnnotatedType(@Observes ProcessAnnotatedType<Object>) receives events for all annotated types. Consider restricting events using @WithAnnotations or a generic type with bounds.
Informações: Inicializando Mojarra 2.2.7 ( 20140610-1547 https://svn.java.net/svn/mojarra~svn/tags/2.2.7@13362) para o contexto '/estudo'
Informações: Monitoring jndi:/server/estudo/WEB-INF/faces-config.xml for modifications
Informações: Running on PrimeFaces 5.0
Informações: Loading application [estudo] at [/estudo]
Informações: estudo was successfully deployed in 13.298 milliseconds.
LogInterceptorImpl上的标记“ START”和“ END”未出现在日志文件中。 他们为什么不开火?
您需要使用@javax.inject.Named
注释而不是@ManagedBean
:
@Named("postController")
@SessionScoped
public class PostController
还添加@AroundInvoke标记拦截器方法:
@Interceptor
@LogInterceptor
public class LogInterceptorImpl {
@AroundInvoke
public Object log(InvocationContext context) {
...
}
}
最后一步,您需要在beans.xml中启用拦截器,否则拦截器将被忽略:
beans.xml
<beans>
<interceptors>
<class>com.nameofyourpackage.LogInterceptorImpl </class>
</interceptors>
</beans>
使用@Named代替@ManagedBean的说明
两种注释的含义基本相同-它们为Bean提供一个文本名称,以便可以在JSF页面中对其进行访问。 但是,标记@ManagedBean
bean是由JSF子系统创建的,并且CDI注释将被忽略(例如SessionScoped或拦截器限定符,例如LogInterceptor)。 标记为@Named
Bean可以充分利用CDI,而您不能使用JSF特定的注释,例如@ManagedProperty
(您应将@Inject与CDI一起使用)。 这不是问题,因为@ManagedProperty
和@ManagedBean
都已弃用,并且总有一种方法可以使用CDI实现相同的目的。 这在这里进行更详细的讨论:是支持bean(@ManagedBean)还是CDI Beans(@Named)?
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