爲什麼有時會調用多個JSF生命週期？

Question

我連接一個簡單的JSF生命週期偵聽到我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()); 
} 

} 

在網頁中的一個予有不便這樣的：

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

其中冠捷在faces-配置配置爲請求簡單豆-scoped：

public class TopView { 

public TopView() { 
} 

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

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

} 

令我奇怪的是，如果我點擊上面的鏈接，似乎一切都正常工作，但根據LiceCycleLi在頁面加載之前，stener的輸出每個階段運行2次（昨天我計數4次，但這是因爲線程問題）。這是正常的行爲嗎？如果這表明我的代碼中存在某種錯誤，我應該在哪裏查找它？

我用鑽嘴魚科2.0.2在Glassfish 3.0.1

這是從今天的嘗試我的輸出。只有兩輪的生命週期，但昨天我有4個。當我看着yestarday的日誌時，發現我有多個線程，所以我猜想它在服務器運行時修改我的應用程序並不合適。但我仍然不知道2輪生命週期是否是件好事。另外請注意，幾乎沒有關於設置字符編碼的警告，但我不知道這是否重要。

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日誌的片段：

[#|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

我不知道這是它是如何應該工作，但它與我的實際發生的觀察相匹配。