为什么有时会调用多个JSF生命周期？

Question

我连接一个简单的JSF生命周期侦听到我webbapp：

public class LifeCycleListener implements PhaseListener 
{ 

@Override 
public PhaseId getPhaseId() { 
    return PhaseId.ANY_PHASE; 
} 

@Override 
public void beforePhase(PhaseEvent event) { 
    System.out.println("START PHASE " + event.getPhaseId()); 
} 

@Override 
public void afterPhase(PhaseEvent event) { 
    System.out.println("END PHASE " + event.getPhaseId()); 
} 

} 

在网页中的一个予有不便这样的：

<h:form> 
    <h:commandLink id="avdertAddedToMainPage" action="#{topView.showMainPage}"> 
     Main Page 
    </h:commandLink> 
</h:form> 

其中冠捷在faces-配置配置为请求简单豆-scoped：

public class TopView { 

public TopView() { 
} 

public String showAddAdvert() 
{ 
    return "addAdvert"; 
} 

public String showMainPage() 
{ 
    return "itemList"; 
} 

} 

令我奇怪的是，如果我点击上面的链接，似乎一切都正常工作，但根据LiceCycleLi在页面加载之前，stener的输出每个阶段运行2次（昨天我计数4次，但这是因为线程问题）。这是正常的行为吗？如果这表明我的代码中存在某种错误，我应该在哪里查找它？

我用钻嘴鱼科2.0.2在Glassfish 3.0.1

这是从今天的尝试我的输出。只有两轮的生命周期，但昨天我有4个。当我看着yestarday的日志时，发现我有多个线程，所以我猜想它在服务器运行时修改我的应用程序并不合适。但我仍然不知道2轮生命周期是否是件好事。另外请注意，几乎没有关于设置字符编码的警告，但我不知道这是否重要。

FINE: [Web-Security] Policy Context ID was: Powypadkowe/Powypadkowe 
FINE: [Web-Security] hasUserDataPermission perm: (javax.security.jacc.WebUserDataPermission /faces/AdvertAddedCl.xhtml POST) 
FINE: [Web-Security] hasUserDataPermission isGranted: true 
FINE: [Web-Security] Policy Context ID was: Powypadkowe/Powypadkowe 
FINE: [Web-Security] hasResource isGranted: true 
FINE: [Web-Security] hasResource perm: (javax.security.jacc.WebResourcePermission /faces/AdvertAddedCl.xhtml POST) 
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /powypadkowe, because request parameters have already been read, or ServletRequest.getReader() has already been called 
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /powypadkowe, because request parameters have already been read, or ServletRequest.getReader() has already been called 
INFO: START PHASE RESTORE_VIEW 1 
INFO: END PHASE RESTORE_VIEW 1 
INFO: START PHASE APPLY_REQUEST_VALUES 2 
INFO: END PHASE APPLY_REQUEST_VALUES 2 
INFO: START PHASE PROCESS_VALIDATIONS 3 
INFO: END PHASE PROCESS_VALIDATIONS 3 
INFO: START PHASE UPDATE_MODEL_VALUES 4 
INFO: END PHASE UPDATE_MODEL_VALUES 4 
INFO: START PHASE INVOKE_APPLICATION 5 
INFO: END PHASE INVOKE_APPLICATION 5 
INFO: START PHASE RENDER_RESPONSE 6 
INFO: ------- some hibernate sql selects ------- 
INFO: END PHASE RENDER_RESPONSE 6 
FINE: SecurityContext: setCurrentSecurityContext method called 
FINE: [Web-Security] Policy Context ID was: Powypadkowe/Powypadkowe 
FINE: [Web-Security] hasUserDataPermission perm: (javax.security.jacc.WebUserDataPermission /faces/photos/nowy17@mail.pl/Atojest/item_1/1m.jpg GET) 
FINE: [Web-Security] hasUserDataPermission isGranted: true 
FINE: [Web-Security] Policy Context ID was: Powypadkowe/Powypadkowe 
FINE: [Web-Security] hasResource isGranted: true 
FINE: [Web-Security] hasResource perm: (javax.security.jacc.WebResourcePermission /faces/photos/nowy17@mail.pl/Atojest/item_1/1m.jpg GET) 
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /powypadkowe, because request parameters have already been read, or ServletRequest.getReader() has already been called 
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /powypadkowe, because request parameters have already been read, or ServletRequest.getReader() has already been called 
INFO: START PHASE RESTORE_VIEW 1 
INFO: END PHASE RESTORE_VIEW 1 
INFO: START PHASE APPLY_REQUEST_VALUES 2 
INFO: END PHASE APPLY_REQUEST_VALUES 2 
INFO: START PHASE PROCESS_VALIDATIONS 3 
INFO: END PHASE PROCESS_VALIDATIONS 3 
INFO: START PHASE UPDATE_MODEL_VALUES 4 
INFO: END PHASE UPDATE_MODEL_VALUES 4 
INFO: START PHASE INVOKE_APPLICATION 5 
INFO: END PHASE INVOKE_APPLICATION 5 
INFO: START PHASE RENDER_RESPONSE 6 
INFO: END PHASE RENDER_RESPONSE 6 
FINE: SecurityContext: setCurrentSecurityContext method called 

而且yestarday日志的片段：

[#|2012-06-04T22:05:49.158+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=30;_ThreadName=Thread-1;|END PHASE UPDATE_MODEL_VALUES 4|#] 

[#|2012-06-04T22:05:49.158+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=33;_ThreadName=Thread-1;|START PHASE RESTORE_VIEW 1|#] 

[#|2012-06-04T22:05:49.161+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=31;_ThreadName=Thread-1;|START PHASE RENDER_RESPONSE 6|#] 

[#|2012-06-04T22:05:49.162+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=33;_ThreadName=Thread-1;|END PHASE RESTORE_VIEW 1|#] 

[#|2012-06-04T22:05:49.163+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=33;_ThreadName=Thread-1;|START PHASE APPLY_REQUEST_VALUES 2|#] 

[#|2012-06-04T22:05:49.261+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=32;_ThreadName=Thread-1;|START PHASE APPLY_REQUEST_VALUES 2|#] 

[#|2012-06-04T22:05:49.261+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=33;_ThreadName=Thread-1;|END PHASE APPLY_REQUEST_VALUES 2|#] 

Answer 1

我不知道这是它是如何应该工作，但它与我的实际发生的观察相匹配。