JSF Backbean Init or constructer calles twise.

Question

Hi,
Am new in JSF , I have a problem which stoped me further developments, Here is the description, Managed backbean Constucter I have Initialized a test field with random number. When the page loads Textbox initialized with new random number. When I submit , in submit button code I print the value from textbox, it shows a diffrent value as becuase Init calls twise. In short, page is initialed when loaded and again initalised when submiting that page So I lost previous random no. displyed... My question is why page initialise twise? How can I retrive previous value...? or solve this issue
Here is my test code..
public class TestBean extends AbstractPageBean {
private void _init() throws Exception {
public TestBean() {
System.out.println("Value before Assiginin.... "+getTxtValue());
setTxtValue("OT" + RandomGenerator.getRandomOrder()); /////// HERE I SET RANDOM TO TEST BOX , WHEN LOAD PAGE GENERATE ONE , AND DISPLAY ON BOX,BUT WHEN SUBMIT BUTTON, THIS CODE EXECUTE AGAIN AND A NEW RANDOM NUMBER PRINT ON SUBMIT BUTTON CODE BELOW.
System.out.println("Value after Assiginin.... "+getTxtValue());
@Override
public void init() {
try {
_init();
} catch (Exception e) {
log("TestBean Initialization Failure", e);
throw e instanceof FacesException ? (FacesException) e: new FacesException(e);
@Override
public void preprocess() {
@Override
public void prerender() {
@Override
public void destroy() {
protected SessionBean1 getSessionBean1() {
return (SessionBean1) getBean("SessionBean1");
private String txtValue;
* @return the txtValue
public String getTxtValue() {
return txtValue;
* @param txtValue the txtValue to set
public void setTxtValue(String txtValue) {
this.txtValue = txtValue;
public String btnModify_action(){
System.out.println("Value is......"+getTxtValue()); /////////////////////////////....HERE I RECEIVE DIFFRENT VALUE
return null;
Can any body help on this , I hope I explained to you...
Thanks
Subin

Answer 1

Thanks, It Resolved my issue. And here is my JSP code with hidden field
<webuijsf:form id="form1">
<webuijsf:label id="label1" style="position: absolute; left: 144px; top: 144px" text="Label"/>
<webuijsf:button actionExpression="#{TestBean.btnModify_action}" id="button1"
style="left: 287px; top: 264px; position: absolute; width: 95px" text="Button"/>
<webuijsf:textField columns="50" id="textField1" readOnly="true" style="position: absolute; left: 216px; top: 144px" text="#{TestBean.txtValue}"/>
<webuijsf:hiddenField id="hiddenField1" text="#{TestBean.txtValue}"/>
</webuijsf:form>
May be helpful to others,...