Trouble creating portlets.

Question

Hi.
I�m trying to create a test portlet that need to edit the values in portlet preferences file. This should be pretty easy, but after going through examples several times I still have trouble finding out why this portlet does not work.
I hope you can look at it, and give me some help.
The goal is to print the title from the xml file in the doView more, and be able to edit it in the doEdit mode. I�ve tried to develop the portlet using Sun Studio Enterprise 7, and I�ve tested it in both Tomcat (using the test environment from Java Studo), and deployed it to my sun portal server. The portlet gives me no errors, but the title still looks empty.
Here is the code:
*xml
<?xml version="1.0" encoding="UTF-8"?>
<portlet>
    <portlet-name>prefs</portlet-name>
    <display-name>prefs</display-name>
    <portlet-class>EditPrefs.prefs</portlet-class>
    <expiration-cache>-1</expiration-cache>
    <supports>
        <mime-type>text/html</mime-type>
        <portlet-mode>EDIT</portlet-mode>
        <portlet-mode>HELP</portlet-mode>
    </supports>
    <portlet-info>
        <title>prefs</title>
        <short-title>p</short-title>
        <keywords>keywords test some words</keywords>
    </portlet-info>
    <portlet-preferences>
        <preference>
            <name>testPref</name>
            <value>testing the preference</value>
        </preference>
    </portlet-preferences>
</portlet>
*java
package EditPrefs;
import java.io.IOException;
import java.util.ResourceBundle;
import javax.portlet.GenericPortlet;
import javax.portlet.PortletConfig;
import javax.portlet.PortletRequest;
import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.PortletException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import java.io.Writer;
public class prefs extends GenericPortlet {   
     protected void doView(RenderRequest request, RenderResponse response) throws PortletException, java.io.IOException {
        response.setContentType("text/html");
        Writer w = response.getWriter();
        String title = request.getParameter("title");
        if(title == null){  w.write("Hello Portlet");   }
        else {     w.write("Title= " + title);  }
     protected void doEdit(RenderRequest request, RenderResponse response) throws PortletException, java.io.IOException {
         response.setContentType("text/html");
         Writer w = response.getWriter();
         String title = request.getParameter("title");
         w.write("<FORM action='" + response.createActionURL().toString() + "'>\n");
         w.write("<label>title:</label><input type=text value='" + title + "' name=title>\n");
         w.write("<input type=submit>\n");
         w.write("</FORM>");
     public void prosessAction(ActionRequest actionRequest, ActionResponse actionResponse) throws PortletException, java.io.IOException {
         String title = actionRequest.getParameter("title");
         if(title == null) {
             title = "title is still null";
         actionResponse.setRenderParameter("title", title);
     protected String getTitle(RenderRequest render) {
         String title = render.getParameter("title");
         if(title != null) { return title; }
         return "Default title";
}Best regards
Kristian

Answer 1

Try this:
portlet.xml:
<portlet-preferences>
<preference>
<name>title</name>
<value>Some title</value>
</preference>
</portlet-preferences>
Portlet.java:
    public void processAction(ActionRequest request, ActionResponse actionResponse) throws PortletException, java.io.IOException {
        PortletPreferences prefs = request.getPreferences();
        String title = request.getParameter("title");
        if(title == null) {
            title = prefs.getValue("title", "Def. title");
        actionResponse.setRenderParameter("title", title);
    protected void doView(RenderRequest request, RenderResponse response) throws PortletException, java.io.IOException {
        PortletPreferences prefs = request.getPreferences();
        String title = request.getParameter("title");
        if (title == null) {
            title = prefs.getValue("title", "Def. title");
        request.setAttribute("title", title);
}view.jsp:
Title: <%=renderRequest.getAttribute("title")%>
<form method="post" action="<portlet:actionURL/>">
<input type="text" size="20" name="title" value="<%=renderRequest.getAttribute("title")%>">
<input type="submit" name="setTitle" value="Set new title">
</form>
...