Multiple times constructors calling in Myfaces

Hi
i m fasing multiple times constructor calling for myfaces programs
i have created a small web appl. with one text box and one submit button, to test this behaviour.
i have used this sample to
get web page
enter some text value
submit the page
and atlast page get returned to me
i don't understand the multiple times consturctor calling and exact sequence of Getter/Setter calling?
Following are details -
faces-config.xml
<managed-bean>
<managed-bean-name>fileUploadBean</managed-bean-name>
<managed-bean-class>com.dbschenker.dts.model.backingbean.FileUpload</managed-bean-class>
<manged-bean-scope>request</manged-bean-scope>
</managed-bean>
jsp file
<h:inputText id="txtSample" value="#{fileUploadBean.txtName}"/>
<h:commandButton action="#{fileUploadBean.uploadFile}"
image="../../images/upload_0.png"
onmouseover="this.src='../../images/upload_0.png'"
onmouseout="this.src='../../images/upload_1.png'"
onclick="return true;"/>
Backing bean
public class FileUpload {
private String txtName;
public void setTxtName(String txtName) {
System.out.println("Calling Setter... ");
this.txtName= txtName;
public String getTxtName() {
System.out.println("Calling Getter... ");
return txtName==null?"":this.txtName;
public FileUpload() {
System.out.println("Calling Constructor... ");
public String uploadFile() {
System.out.println("Upload Form Submitted... ");
return "";
Output to Console
Calling Constructor...
Calling Getter...
Calling Constructor...
Calling Constructor...
Calling Getter...
Calling Constructor...
Calling Setter...
Calling Constructor...
Upload Form Submitted...
Calling Constructor...
Calling Getter...

Hi
that blog was really good and in depth...
but i have one real time problem with multiple time constructor calling
if you replace text box with file upload tag in my earlier sample program and then following is out put ...
Calling Constructor...
getUploadedFile()...
Calling Constructor...
getUploadedFile()...
Calling Constructor...
setUploadedFile()...
Uploaded File Name - D:\AsnUploadTemplate02.XLS
Calling Constructor... ------------------(.1
Upload Form Submitted...
java.lang.NullPointerException
at com.dbschenker.dts.model.backingbean.FileUpload.uploadFile(FileUpload.java:40)
----------- trailing exception stack trace...
Calling Constructor...
getUploadedFile()...
form this output u can find that my UploadedFile backing bean object gets null just before form submit method...
whereas its has been properly instantiated in setter method,
if constructor (1 wasn't call then object (uploadedFile) can be found in method (FileUpload.uploadFile)
i have also tried to make scope of backing bean Session , but constructor, getter & setter calling sequence doesn't different even after.
i have also considered both of your blog as ---
http://balusc.blogspot.com/2006/09/debug-jsf-lifecycle.html
http://balusc.blogspot.com/2008/02/uploading-files-with-jsf.html
but my problem stands as it is
kindly help

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Hi
that blog was really good and in depth...
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Hi
that blog was really good and in depth...
but i have one real time problem with multiple time constructor calling
if you replace text box with file upload tag in my earlier sample program and then following is out put ...
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whereas its has been properly instantiated in setter method,
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i have also tried to make scope of backing bean Session , but constructor, getter & setter calling sequence doesn't different even after.
i have also considered both of your blog as ---
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Message was edited by:
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<removed by moderator>
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Solved!
Go to Solution.
Attachments:
VIT_Reentrant.png ‏18 KB

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Multiple times constructors calling in Myfaces

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