My Space

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http://www.opensource-techblog.com/2013/03/creating-service-layer-in-service.html
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SP:1529

link to null value in reply to comment.

src/main/webapp/WEB-INF/jsp/html/taglib/ui/bootstrap_discussion/page.jsp

Line no.

+421 <c:if test="<%= !hideControls && MBDiscussionPermission.contains(permissionChecker, company.getCompanyId(), scopeGroupId, permissionClassName, permissionClassPK, userId, ActionKeys.ADD_DISCUSSION) %>">

+479 </c:if> 

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comment box at jsp

        <c:if test="<%= enableComments %>">
            <liferay-ui:panel-container extended="<%= false %>" id="wikiCommentsPanelContainer" persistState="<%= true %>" cssClass="container bootstrapped">
                <liferay-ui:panel collapsible="<%= true %>" extended="<%= true %>" id="wikiCommentsPanel" persistState="<%= true %>" title="comments" cssClass="panel panel-info bootstrapped">
                    <portlet:actionURL var="discussionURL">
                        <portlet:param name="struts_action" value="/wiki/edit_page_discussion" />
                    </portlet:actionURL>
   
                    <liferay-ui:bootstrap-discussion
                        className="<%= WikiPage.class.getName() %>"
                        classPK="<%= wikiPage.getResourcePrimKey() %>"
                        formAction="<%= discussionURL %>"
                        formName="fm2"
                        ratingsEnabled="<%= enableCommentRatings %>"
                        redirect="<%= currentURL %>"
                        subject="<%= wikiPage.getTitle() %>"
                        userId="<%= wikiPage.getUserId() %>"
                    />
                </liferay-ui:panel>
            </liferay-ui:panel-container>
        </c:if>
    </c:if>

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Hide a portlet from liferay in respective of user's role
add layout.show.portlet.access.denied=falsein portal-ext.properties
for more see kamal kant rajput's blog http://kamalkantrajput.blogspot.in/2010/03/hiding-portlet-in-liferay.html