Implementing Hooks in Liferay-portal-6.0.5 using Liferay-developer-studio1.5.2

For basics about hooks refer to:
http://www.liferay.com/web/jonas.yuan/blog/-/blogs/4639517

All hook projects will be like abc-hook
To make any change in any existing functionality of liferay we use hook. For ex. if u want to modify login jsp then u can use login-hook.. The name is up to you..

Note:- creating a hook for your custom portlet is not preferred, better change your code rather than adding a hook for it.

so we will create a hook for login

Since we have mainly 4 hooks:
1. custom-jsp
2. portal-properties
3. language
4. service

Steps for creating a custom-jsp hook:-
1. Open your IDE.
2. Go to File->New->Liferay Project
3. Choose HOOK in Plugin Type and Finish.

 4. After this GoTo the  package explorer and then to your Project (login-hook) Right-Click, in the drop-down menu select new->Liferay hook

5. In the appeared dialog box. check the Custom Jsps hook to create.






6. Select Login.jsp and then click OK.

7.  click Finish.
8.  Goto  \login-hook\custom_jsps\html\portlet\login\login.jsp and add your own modification
 like:- add some line "Hi This is my new Login Hook".
like I added herein.

<%@ include file="/html/portlet/login/init.jsp" %>

<c:choose>
    <c:when test="<%= themeDisplay.isSignedIn() %>">

        <%
        String signedInAs = HtmlUtil.escape(user.getFullName());

        if (themeDisplay.isShowMyAccountIcon()) {
            signedInAs = "<a href=\"" + HtmlUtil.escape(themeDisplay.getURLMyAccount().toString()) + "\">" + signedInAs + "</a>";
        }
        %>

        <%= LanguageUtil.format(pageContext, "you-are-signed-in-as-x", signedInAs) %>
    </c:when>
    <c:otherwise>

        <%
        String redirect = ParamUtil.getString(request, "redirect");

        String login = LoginUtil.getLogin(request, "login", company);
        String password = StringPool.BLANK;
        boolean rememberMe = ParamUtil.getBoolean(request, "rememberMe");

        if (Validator.isNull(authType)) {
            authType = company.getAuthType();
        }
        %>

        <portlet:actionURL secure="<%= PropsValues.COMPANY_SECURITY_AUTH_REQUIRES_HTTPS || request.isSecure() %>" var="loginURL">
            <portlet:param name="saveLastPath" value="0" />
            <portlet:param name="struts_action" value="/login/login" />
        </portlet:actionURL>
   "Hi This is my new Login Hook".
        <aui:form action="<%= loginURL %>" method="post" name="fm">
            <aui:input name="redirect" type="hidden" value="<%= redirect %>" />

            <c:if test='<%= SessionMessages.contains(request, "user_added") %>'>

                <%
                String userEmailAddress = (String)SessionMessages.get(request, "user_added");
                String userPassword = (String)SessionMessages.get(request, "user_added_password");
                %>

                <div class="portlet-msg-success">
                    <c:choose>
                        <c:when test="<%= company.isStrangersVerify() || Validator.isNull(userPassword) %>">
                            <%= LanguageUtil.format(pageContext, "thank-you-for-creating-an-account-your-password-has-been-sent-to-x", userEmailAddress) %>
                        </c:when>
                        <c:otherwise>
                            <%= LanguageUtil.format(pageContext, "thank-you-for-creating-an-account-your-password-is-x", new Object[] {userPassword, userEmailAddress}, false) %>
                        </c:otherwise>
                    </c:choose>
                </div>
            </c:if>
 .......................(ctd)

9. Deploy the hook.

You can see the login Portlet showing the changes you made....

Thanks