DataModelSelection value not injected
I cannot get selected value injected into field marked by @DataModelSelection. I copied and modified an example from seam tutorials messages
example.
The @DataModelSelection field is called message
, and it is always null, even after i clicked on the commandLink
link.
Can someone help me to spot why no value is ever injected into message
?
here are my classes:
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import static org.jboss.seam.ScopeType.EVENT;
import java.io.Serializable;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
@Name("message")
@Scope(EVENT)
public class Message implements Serializable
{
public Message(){
this.title = "";
this.text = "";
this.read = false;
}
public Message(String title, String text, boolean read){
this.title = title;
this.text = text;
this.read = read;
}
private String title;
private String text;
private boolean read;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public boolean isRead() {
return read;
}
public void setRead(boolean read) {
this.read = read;
}
}---------------------------------------------
import java.util.List;
import javax.ejb.Local;
@Local
public interface MessageManager
{
public void findMessages();
public void select();
public void delete();
public void destroy();
public Message getMessage();
public void setMessage(Message message);
public List<Message> getMessageList();
public void setMessageList(List<Message> messageList);
} ---------------------------------------------
import static org.jboss.seam.ScopeType.SESSION;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Remove;
import javax.ejb.Stateful;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Destroy;
import org.jboss.seam.annotations.Factory;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Out;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.datamodel.DataModel;
import org.jboss.seam.annotations.datamodel.DataModelSelection;
@Stateful
@Scope(SESSION)
@Name("messageManager")
public class MessageManagerBean implements Serializable, MessageManager
{
@DataModel(scope=ScopeType.PAGE)
private List<Message> messageList;
@DataModelSelection
@Out(required=false)
private Message message;
@Factory("messageList")
public void findMessages()
{
System.out.println("in findMessages(), by factory, making messages");
messageList = new ArrayList<Message>();
Message first = new Message("First", "This is a great message", true);
messageList.add(first);
Message second = new Message("Second", "This is an average message", false);
messageList.add(second);
}
public void select()
{
if (message!=null){
message.setRead(true);
System.out.println("in select(), for message: " + message.getTitle());
}
else{
System.out.println("in select(), NULL message");
}
}
public void delete()
{
if (message!=null)
{
System.out.println("deleting message: " + message.getTitle());
for(int i=0;i<messageList.size(); i++){
if(((Message)messageList.get(i)).getTitle().equalsIgnoreCase(message.getTitle())){
messageList.remove(i);
}
}
message=null;
}
System.out.println("in delete(), but message is NULL");
}
public List<Message> getMessageList() {
return messageList;
}
public void setMessageList(List<Message> messageList) {
this.messageList = messageList;
}
public Message getMessage() {
return message;
}
public void setMessage(Message message) {
this.message = message;
System.out.println("set message to: " + message.getTitle());
}
@Remove @Destroy
public void destroy() {}
}---------------------------------------------------
here is my view class, it is called messages.xhtml:
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:s="http://jboss.com/products/seam/taglib"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:rich="http://richfaces.org/rich"
xmlns:p="http://jboss.com/products/seam/pdf"
xmlns:a="http://richfaces.org/a4j" template="layout/template.xhtml">
<ui:define name="body">
<h:form id="messageForm">
<rich:panel>
<h:outputText
value="No datastore to display: #{messageManager.messageList.size}"
rendered="#{messageManager.messageList.size == 0}" />
<h:outputText
value="Total number of messages: #{messageManager.messageList.size}"
rendered="#{messageManager.messageList.size != 0}" />
<h:dataTable id="messages" var="msg"
value="#{messageManager.messageList}"
rendered="#{messageManager.messageList.size>0}">
<h:column>
<f:facet name="header">
<h:outputText value="Read" />
</f:facet>
<h:selectBooleanCheckbox id="read" value="#{msg.read}"
disabled="true" />
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Title" />
</f:facet>
<h:commandLink id="link" value="#{msg.title}"
action="#{messageManager.select}" />
</h:column>
<h:column>
<s:button id="delete" value="Delete"
action="#{messageManager.delete}" />
</h:column>
</h:dataTable>
<h3><h:outputText id="title" value="#{message.title}"/></h3>
<div><h:outputText id="text" value="#{message.text}"/></div>
</rich:panel>
</h:form>
</ui:define>
</ui:composition>
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