Vicente Soriano Martinez:
If you're getting a NullPointerException then it's a matter of looking what variable is null and why it is null.
In this case, I guess your list object seems the perfect candidate to be null, which is probably caused because the variable usersJsp is filled with null values at some point. Did you checked your UsersLocalServiceUtil.getUserses() method? Did it return values?
You may need to debug your code in order to search for that null value.
Here is my complete list.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.util.*" %>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@ taglib uri="http://liferay.com/tld/aui" prefix="aui" %>
<%@ page import="com.test.service.UsersLocalServiceUtil" %>
<%@ page import="com.test.PaginationUtility" %>
<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>
<%@ page isELIgnored ="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<portlet:defineObjects />
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
Good to list!
<%List<com.test.model.Users> usersJsp=UsersLocalServiceUtil.getUserses(0,UsersLocalServiceUtil.getUsersesCount());
long operationalId=1;
for(int i=0;i<usersJsp.size();i++)
{
String value=usersJsp.get(i).toString().replace("{", " ").replace("}", " ");
}
%>
<table border="1" width="50%">
<tr>
<th>ID</th>
<th>First Name</th>
<th>Email</th>
<th>Actions</th>
</tr>
<c:forEach items="<%=usersJsp%>" var="list">
<tr>
<td>
<c:out value="${list.id }"></c:out>
</td>
<td>
<c:out value="${list.fname}"></c:out>
</td>
<td>
<c:out value="${list.email}"></c:out>
</td>
<td>
<portlet:renderURL var="Update_controller">
<portlet:param name="jspPage" value="/html/users/update.jsp" />
<portlet:param name="updateParam" value="${list.id }" />
</portlet:renderURL>
<liferay-ui:icon id="${list.id }"image="edit" url="<%=Update_controller%>"/>
</td>
</tr>
</c:forEach>
</table>
</body>
update.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="com.liferay.portal.kernel.util.ParamUtil" %>
<%@ page import="javax.portlet.ActionRequest" %>
<%@ page import="javax.portlet.ActionResponse" %>
<%@ taglib uri="http://liferay.com/tld/aui" prefix="aui" %>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<portlet:defineObjects />
<%!
ActionRequest portletRequest;
ActionResponse portletResponse;
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<%
String id=ParamUtil.getString(portletRequest, "updateParam"); %>
<body>
<aui:input label="Value" name="value" type="text" value="<%=id %>"></aui:input>
</body>
</html>
The out put from list.jsp is all the records from the desired database,
it successfully displays all the user from database, but when we click on the icon which is provided with certain url, it throws null pointer error, and one more thing i'll like to add,
if i comment the line of code which is in red colour, and remove it form value assigned to the text field
it runs without error,this makes me think that ParamUtil might be throwing null due to some or other reason(which i dont know).
Another inspection shows that, when we inspect the icon i found the following:
<a href="http://localhost:8080/web/guest/servicebuilder?p_p_id=users_WAR_Portalportlet&p_p_lifecycle=0&p_p_state=normal&p_p_mode=view&p_p_col_id=column-1&p_p_col_count=1&_users_WAR_Portalportlet_jspPage=%2Fhtml%2Fusers%2Fupdate.jsp&_users_WAR_Portalportlet_
updateParam=501" target="_self" class=" lfr-icon-item taglib-icon" id="_users_WAR_Portalportlet_501"> <img id="501" src="http://localhost:8080/o/classic-theme/images/common/edit.png" alt="Edit" title="Edit"> <span class="taglib-text hide-accessible">Edit</span> </a>
The variable updateParam captures the value, but i'm failing to get that value in another jsp, Any help would be greatly appreciated.
