Liferay is easy: Dynamic SessionErrors in Liferay 7.3

Today we will see how we can send error message from our controller. Here we set the error message in controller which is dynamic and view this on jsp with single tag.

So lets start this step by step :-

Step 1:- Create MVC Portlet

Just Create a simple MVC Portlet and paste this content in the controller.

DynamicSessionErrorPortlet.java

	package com.liferay.dynamic.portlet;

	import com.liferay.dynamic.constants.DynamicSessionErrorPortletKeys;

	import com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet;
	import com.liferay.portal.kernel.servlet.SessionErrors;

	import java.io.IOException;

	import javax.portlet.Portlet;
	import javax.portlet.PortletException;
	import javax.portlet.RenderRequest;
	import javax.portlet.RenderResponse;

	import org.osgi.service.component.annotations.Component;

	/**
	* @author adit2
	*/
	@Component(
	immediate = true,
	property = {
	"com.liferay.portlet.display-category=category.Liferay Is Easy",
	"com.liferay.portlet.header-portlet-css=/css/main.css",
	"com.liferay.portlet.instanceable=true",
	"javax.portlet.display-name=DynamicSessionError",
	"javax.portlet.init-param.template-path=/",
	"javax.portlet.init-param.view-template=/view.jsp",
	"javax.portlet.name=" + DynamicSessionErrorPortletKeys.DYNAMICSESSIONERROR,
	"javax.portlet.resource-bundle=content.Language",
	"javax.portlet.security-role-ref=power-user,user"
	},
	service = Portlet.class
	)
	public class DynamicSessionErrorPortlet extends MVCPortlet {
	@Override
	public void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws IOException, PortletException {
	try {

	throw new ArithmeticException("This is Arithmatic Exception");
	//throw new NullPointerException("This is Null pointer Exception");

	} catch (Exception e) {
	System.out.println("Inside exception "+e.getMessage());
	SessionErrors.add(renderRequest, "dynamic-error-msg",e.getMessage());
	}
	super.doView(renderRequest, renderResponse);
	}
	}

view raw DynamicSessionErrorPortlet.java hosted with ❤ by GitHub

Step 2:- Change your view.jsp

Now open your view.jsp and paste this:-

view.jsp


	<%@page import="com.liferay.portal.kernel.portlet.LiferayPortletRequest"%>
	<%@page import="com.liferay.portal.kernel.servlet.SessionErrors"%>
	<%@ include file="/init.jsp" %>
	<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>

	<liferay-ui:error key="dynamic-error-msg">
	<liferay-ui:message key="dynamic.error.msg" arguments="<%= SessionErrors.get(liferayPortletRequest, "dynamic-error-msg") %>"/>
	</liferay-ui:error>
	<h3>This Portlet Show Dynamic Errors</h3>