Develop Reference

How to prepopulate a form in Stripes?

I have a Stripes form using an Action bean.
I can store the data without any problem out of the form, but I did not find out how to prepopulate the form's data.
I have simplified my example to show what's not working.
My code under #Before is without any effect: the data dont go into the form.
How should I manage this approach?
myform.jsp:
...
<stripes:form beanclass="UserActionBean">
...
<stripes:text name="user" />
<stripes:submit name="store" value="Save" />
...
</stripes:form>
...
ActionBean:
public class UserActionBean implements ActionBean {
private String user;
#Before
public void init() {
user = "myuser";
}
#DefaultHandler
public Resolution store() {
...
}
}

You will need public getters and setters for Stripes to be able to read the value.
Although usually I would use the #DefaultHandler for the get, and then create a new handler for the save e.g. #HandlesEvent(value = "save") public Resolution save () {...

This might be crude, but I used a getter like Scary Wombat said and initialized the variable in the ActionBean. Or you could set its value in your handler that does the initial page display.
#Validate(required = true, on = {
"proceed"
})
private String tumblrUrl= "xyz.tumblr.com";
...
public String getTumblrUrl() {
return this.tumblrUrl;
}
public void setTumblrUrl(final String tumblrUrl) {
this.tumblrUrl = tumblrUrl;
}

pass form values in managed bean

i want to pass my form value into my managed bean in order to process it but i always got a null value when i try to retrieve the value in my action method
My bean
#ManagedBean(name="datas")
#SessionScoped
public class Datas implements Serializable {
private static final long serialVersionUID = 1L;
private String ID_primary;
public Datas(){
}
public Datas (String ID_primary){
this.ID_primary=ID_primary;
}
public String getID_primary() {
return ID_primary;
}
public void setID_primary(String ID_primary) {
this.ID_primary= ID_primary;
}
public void process() {
Map<String, String> request=FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();
String value = request.get("ID_primary"); // always return null
System.out.println("ID" + value);
}
}
My form
<h:form>
<div align="left">
<h:inputText id="ID_primary" name="ID_primary" value="#{datas.ID_primary}" />
</div>
..........
<div align="right">
<h:commandButton action="#{datas.process()}" value="Create" type="submit" />
</div>
</h:form>
Thank you very much for your help

You have two different form elements, when you click commandButton in the bottom form, values from the top form are not send with the request.
You can have tags like div inside a form, so you can make on big form with divs inside if it is the reason why you have have split them.
Also add #ManagedProperty annotation to ID_primary field:
public class Datas implements Serializable {
private static final long serialVersionUID = 1L;
#ManagedProperty(value = "#{Datas.ID_primary}")
private String ID_primary;
[..]
EDIT:
Ok, my bad, I have not looked at the code carefully. In ManagedBean with ManagedProperty this property will be set automatically by JSF, so you can read it like this:
public void process() {
System.out.println("ID" + getID_primary());
}

Java/Java EE : to invoke getter method from JSP

I want to invoke a getter method (returns String value) of a Java class from JSP by using "jsp:usebean", but it returns a null value. What I don't understand is why it can't return the updated value.
Can someone shed some light on this?
Should I use a Cookie to get the value from JSP?

I'm not sure what you're using (Struts, plain Servlets, etc.) but essentially you need to add an attribute to the ServletRequest like:
class Person {
private String firstName;
// other fields, getters, setters
}
public void method(HttpServletRequest httpServletRequest) {
Person p = new Person();
p.setFirstName("Obama");
httpServletRequest.setAttribute("person", p);
}
and in your JSP:
<jsp:getProperty object="person" property="firstName" />
or if you use JSTL:
<c:out value="${person.firstName}"/>

It is simple.
In java file:
package loga;
class bean{
String name;
public void setName(String Uname)
{
this.name=Uname;
}
public void getName()
{
return name;
}
In jsp file, call this method as:
<jsp:useBean id="object" class="loga.bean">
<jsp:setproperty name="object" property="Name" Value="XXXX"/>
<jsp:getProperty name="object" property="Name"/>
</jsp:usebean>
Here, the property indicates the method name of the getName() in the java class.
To pass value from other controls use param property and give name of the control.

Writing a string property of an object with <html:text />

I've got an object in my form that contains various string properties.
When I want to print it in my JSP form I could do it with
<c:out value="${form.company.address}" />
which works perfectly.
Now I want to create an HTML input field. But when I write
<html:text property="company.address" />
I get an error saying
Caused by: javax.servlet.jsp.JspException: No getter method for property company.address of bean org.apache.struts.taglib.html.BEAN
Do you know how I can create an HTML input field with my company's address?
My bean's got the necessary corresponding getters and setters.

The correct way of translating this:
<c:out value="${UFForm.company.address}" />
to Struts is,
<html:text name="UFForm" property="company.address">
It means that there's a request with name UFForm with a bean that contains a method getCompany() (which I'm assuming returns a Company object) and that in turns has a getAddress() getter (if you understand what I mean). In a nutshell, the bean from request/session UFForm, the TagLib is accessing getCompany().getAddress();
PS Hope that getAddress() doesn't return a null else <html:text /> will throw an exception.
Edit To explain what I did above:
public class Company implements Serializable {
private String address;
//Setter
public void setAddress(String address) {
this.address = address;
}
//Getter
public String getAddress() { return this.address; }
}
public class UFForm implements Serializable {
private Company company;
public void setCompany(Company company) {
this.company = company;
}
public void getCompany() {
if (this.company == null) {
setCompany(new Company());
}
return this.company;
}
}
What I did above in <html:text /> is equivalent to
UFForm ufForm = ....;
String property = ufForm.getCompany().getAddress();

Your bean should have corresponding setter and getter methods.
Html form
<html:text property="name" size="10" maxlength="10">
Corresponding bean.
public class AddressForm
{
private String name=null;
public void setName(String name){
this.name=name;
}
public String getName(){
return this.name;
}
}

When you are getting the value for the text box with:
<html:text property="company.address" />
You are in fact saying to Struts to do:
formObject.getCompany().getAddress();
So you must have a getter for the company (which must not return null or the next operation will fail) and a setter for the address on the company object. The setters/getters must be public. This must already be the case since you can do the following with no error:
<c:out value="${UFForm.company.address}" />
Now, the thing that bugs me is this part: ${UFForm.. When you use JSTL you are accessing the form explicitly. With the <html:text> you access a property on the form implicitly. This implicit form is provided by the enclosing <html:form> tag. Do you have the <html:text> inside a <html:form>?
The form bean is located/created/exposed based on the form bean specification for the associated ActionMapping so check your mapping also.

Spring validation errors not displayed

I have the following situation. I have a validator to validate my command object and set the errors on a Errors object to be displayed in my form. The validator is invoked as expected and works okay, but the errors i set on the Errors objects are not displayed, when i am sent back to my form because of the validation errors.
Validator:
public void validate(Object obj, Errors err) {
MyCommand myCommand = (MyCommand) obj;
int index = 0;
for (Field field : myCommand.getFields()) {
if (field.isChecked()) {
if ((field.getValue() == null) || (field.getValue().equals(""))) {
err.rejectValue("fields[" + index + "].value", "errors.missing");
}
}
index++;
}
if (myCommand.getLimit() < 0) {
err.rejectValue("limit", "errors.invalid");
}
}
Command:
public class MyCommand {
private List<Field> fields;
private int limit;
//getters and setters
}
public class Field {
private boolean checked;
private String name;
private String value;
//getters and setters
}
Form:
<form:form id="myForm" method="POST" action="${url}" commandName="myCommand">
<c:forEach items="${myCommand.fields}" var="field" varStatus="status">
<form:checkbox path="fields[${status.index}].checked" value="${field.checked}" />
<c:out value="${field.name}" />
<form:input path="fields[${status.index}].value" />
<form:errors path="fields[${status.index}].value" cssClass="error" /></td>
<form:hidden path="fields[${status.index}].name" />
</c:forEach>
<fmt:message key="label.limit" />
<form:input path="limit" />
<form:errors path="limit" cssClass="error" />
</form:form>
Controller:
#RequestMapping(value = REQ_MAPPING, method = RequestMethod.POST)
public String onSubmit(Model model, MyCommand myCommand, BindingResult result) {
// validate
myCommandValidator.validate(myCommand, result);
if (result.hasErrors()) {
model.addAttribute("myCommand", myCommand);
return VIEW;
}
// form is okay, do stuff and redirect
}
Could it be that the paths i give in the validator and tag are not correct? The validator validates a command object containing a list of objects, so that's why i give a index on the list in the command object when registering an error message (for example: "fields["+index+"]".value).
Or is it that the Errors object containing the errors is not available to my view?
Any help is welcome and appreciated, it might give me a hint or point me in right direction.

I found what is your problem.
property fields in object myCommand always null.
You need to create constructor for class MyCommand in which you need to use LazyList from Apache Commons or AutoPopulatingList from Spring to create auto growing list of Field
In example (using AutoPopulatingList):
public class MyCommand {
private List<Field> fields;
private int limit;
//getters and setters
//...
//Constructor
public MyCommand() {
fields = new AutoPopulatingList<Field>(Field.class);
}
}

The line err.rejectValue("fields[" + index + "].value", "errors.missing"); will not do what you are trying to achieve. The first argument must be a property name of your Command bean, in your case fields.
To give the user a message you will have to use a parameterizable message in your properties file, eg. myform.field.error = you have an error in field {0}
So, use this method of the Errors object:
void rejectValue(String field, String errorCode, Object[] errorArgs, String defaultMessage)
Where you pass index into errorArgs