How to change the preferences so that each window displays something different?

Question

I'm trying to override values of preferences, but nothing overrides. Does anyone know how to fix this?

portlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<portlet-app xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0" xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd">
    <portlet>
        <portlet-name>cool_portlet</portlet-name>
        <portlet-class>org.springframework.web.portlet.DispatcherPortlet</portlet-class>
        <supports>
            <mime-type>text/html</mime-type>
            <portlet-mode>view</portlet-mode>
        </supports>
        <supported-locale>en</supported-locale>
        <resource-bundle>com.app.portlet.cool_portlet</resource-bundle>
        <portlet-info>
            <title>Cool Portlet</title>
        </portlet-info>     
        <portlet-preferences>
            <preference>
                <name>KEY</name>
                <value>TEST</value>
                <read-only>false</read-only>
            </preference>
        </portlet-preferences>
    </portlet>
</portlet-app>

portlet-instances.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE deployments PUBLIC "-//JBoss Portal//DTD Portlet Instances 2.6//EN" "http://www.jboss.org/portal/dtd/portlet-instances_2_6.dtd">
<deployments>
   <deployment>
      <instance>
         <instance-id>coolPortlet_IMPORT_newInstance</instance-id>
         <portlet-ref>cool_portlet</portlet-ref>
          <preferences>
              <name>KEY</name>
              <value>IMPORT</value>
          </preferences>
      </instance>
   </deployment>
    <deployment>
        <instance>
            <instance-id>coolPortlet_EXPORT_newInstance</instance-id>
            <portlet-ref>cool_portlet</portlet-ref>
            <preferences>
                <name>KEY</name>
                <value>EXPORT</value>
            </preferences>
        </instance>
    </deployment>
</deployments>

cool_portlet-object.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE deployments PUBLIC "-//JBoss Portal//DTD Portlet Instances 2.6//EN" "http://www.jboss.org/portal/dtd/portlet-instances_2_6.dtd">
<deployments>
    <deployment>
        <parent-ref>comportal.import</parent-ref>
        <if-exists>overwrite</if-exists>
        <window>
            <window-name>impWindow</window-name>
            <content>
                <content-type>portlet</content-type>
                <content-uri>coolPortlet_IMPORT_newInstance</content-uri>
            </content>
            <region>center</region>
            <height>1</height>
            <supported-window-states>
                <window-state>normal</window-state>
                <window-state>maximized</window-state>
                <window-state>minimized</window-state>
            </supported-window-states>
            <initial-window-state>normal</initial-window-state>
        </window>
    </deployment>
    <deployment>
        <parent-ref>comportal.export</parent-ref>
        <if-exists>overwrite</if-exists>
        <window>
            <window-name>expWindow</window-name>
            <content>
                <content-type>portlet</content-type>
                <content-uri>coolPortlet_EXPORT_newInstance</content-uri>
            </content>
            <region>center</region>
            <height>1</height>
            <supported-window-states>
                <window-state>normal</window-state>
                <window-state>maximized</window-state>
                <window-state>minimized</window-state>
            </supported-window-states>
            <initial-window-state>normal</initial-window-state>
        </window>
    </deployment>
</deployments>

MainController.java

@RequestMapping(value = "VIEW")
@Controller(value = "mainController")
public class MainController {
    @RenderMapping
    public String init(@RequestParam(value = "key", required = false) String key, Model model, PortletRequest request) throws Exception {
        PortletPreferences preferences = request.getPreferences();
        String preferencesKey = preferences.getValue("KEY", "Not Found!!!");
        System.out.println("KEY is : " + preferencesKey);
        model.addAttribute("preferencesKey", preferencesKey);
        return "index";
    }
}

Output:

13:49:54,860 INFO  [STDOUT] KEY is : TEST
13:50:21,088 INFO  [STDOUT] KEY is : TEST

Answer 1

You need to call setValue and then store your PortletPreferences object. Note that preferences can only be stored in action phase. visit