6 Replies Latest reply on Mar 11, 2013 9:18 AM by kenfinni

Custom JSF Converter & CDI

mbasovni Feb 24, 2013 12:09 PM

Hello,

could somebody help me to solve problem how to inject EntityManager (or another DAO class) in "object converter class" which implements interface javax.faces.convert.Converter?

My converter CalendarConverter looks like:

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;
import javax.inject.Inject;
import javax.persistence.EntityManager;


@FacesConverter(forClass=Calendar.class)
public class CalendarConverter implements Converter {

    @Inject
    private EntityManager em;

    @Override
    public Object getAsObject(FacesContext context, UIComponent component,
        String value) {

        return em.find(Calendar.class, Integer.parseInt(value));
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component,
            Object value) {

        return String.valueOf(((Calendar) value).getId());

    }

}

And I use here:

        <h:selectOneMenu value="#{eventController.event.calendar}" id="calendar">
            <f:selectItems value="#{calendarController.getAllCalendars()}" var="calendarItem" 
                itemValue="#{calendarItem}" itemLabel="#{calendarItem.name}" /> 

        </h:selectOneMenu>

I have read really a lot of articles how to try to solve it, but no solution.

e.g.

- I tried to add @Named

- I tried to find EntiityManager by function lookup

https://community.jboss.org/message/652470#652470

- Adding of @PersistenceContext

http://stackoverflow.com/questions/13182660/conversion-error-setting-value-52-for-null-converter

- somebody used something like this

https://community.jboss.org/thread/178777

Also this article was helpful:

http://stackoverflow.com/questions/4734580/jsf-2-selection-combo-box-with-without-conversion-strategy/4735322#4735322

Has somebody any idea?

1. Re: Custom JSF Converter & CDI

kenfinni Feb 25, 2013 9:42 AM (in response to mbasovni)

Martin,

I'm confused about what the problem is.

Are you getting an exception of some kind?

Or is the code you have not doing anything?

Ken
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2. Re: Custom JSF Converter & CDI

mbasovni Feb 26, 2013 1:09 PM (in response to kenfinni)
When I have for my CalendarConverter only one annotation:

@FacesConverter(forClass=Calendar.class)

and I inject EntityManager just like this:

@Inject private EntityManager em;

I get NullPointerException. Look at file "log1".

When I tried to add:

@Named

=> the same exception

Gatein: 3.5.2.Final
Portletbridge: 3.2.0.Beta1
JBoss AS: 7.1.3.Final
cdi-portlet-integration: 1.0.0.Alpha2

log1.zip 2.8 KB
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3. Re: Custom JSF Converter & CDI

kenfinni Feb 26, 2013 1:13 PM (in response to mbasovni)

Martin,

After looking at http://stackoverflow.com/questions/13182660/conversion-error-setting-value-52-for-null-converter did you add @ManagedBean onto your converter?

As BalusC points out in his response, without @ManagedBean the EntityManager will not be injected. Also, the EntityManager would need to use @PersistenceContext instead of @Inject, unless you had a CDI producer creating the EntityManager that could then be injected.

Ken
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4. Re: Custom JSF Converter & CDI

mbasovni Feb 26, 2013 1:23 PM (in response to kenfinni)

Ken,

look at it. It does not work!

package dip.xbasov00.calendar.util;

import javax.faces.bean.ManagedBean;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import dip.xbasov00.calendar.domain.Calendar;

@ManagedBean
@FacesConverter(forClass=Calendar.class)
public class CalendarConverter implements Converter {

    @PersistenceContext
    private EntityManager em;

    @Override
    public Object getAsObject(FacesContext context, UIComponent component,
        String value) {

        System.out.println("CalendarConverter.getAsObject: " + value);
        if (em == null)
            System.out.println("EntityManager is NULL !!!!");
        return em.find(Calendar.class, Integer.parseInt(value));
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component,
            Object value) {

        System.out.println("CalendarConverter.getAsString: " + value.toString());
        return String.valueOf(((Calendar) value).getId());

    }
}

NullPointerException again... :-(

Martin

5. Re: Custom JSF Converter & CDI

mbasovni Mar 11, 2013 7:14 AM (in response to mbasovni)

Problem is resolved:

@FacesConverter(value="calendarConverter", forClass=Calendar.class)
public class CalendarConverter implements Converter {

    private CalendarDAO calendarDao;

    public CalendarConverter() {
        super();
        try {
            InitialContext ic = new InitialContext();
            calendarDao = (CalendarDAO) ic.lookup("java:module/EJBCalendarDAO");
           } catch (NamingException e) {
            e.printStackTrace();
       }
    }

    @Override
    public Object getAsObject(FacesContext context, UIComponent component,
        String value) {

        Calendar c = calendarDao.getCalendar(Integer.parseInt(value));
        return c;
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component,
            Object value) {

        return String.valueOf(((Calendar) value).getId());

    }
}

Calendar class must override metod equals and hashCode!

6. Re: Custom JSF Converter & CDI

kenfinni Mar 11, 2013 9:18 AM (in response to mbasovni)

Martin,

Glad you were able to figure out the problem.

Ken
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