Null Pointer Exception in StrutsActionProxy on running application

[Shikha Dhawan]

Hi,

When I run my web application (struts2) , the index page is displayed correctly. When I click the button on the index page, the following error occurs:

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:500)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.

I'm not able to understand the reason. I'm new to web app development, please help..

Struts.xml :

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<!-- START SNIPPET: xworkSample -->
<struts>

	<!-- Some or all of these can be flipped to true for debugging -->
	<constant name="struts.i18n.reload" value="true" />
	<constant name="struts.devMode" value="true" />
	<constant name="struts.configuration.xml.reload" value="false" />
	<constant name="struts.custom.i18n.resources" value="global" />
	<constant name="struts.action.extension" value="action" />

	<constant name="struts.serve.static" value="true" />
	<constant name="struts.serve.static.browserCache" value="false" />

	<constant name="actionPackages" value="com.oxxo.pilot.web.action" />

	<package name="default" namespace = "/"  extends="struts-default">
	
	
	<action name="test" class="com.oxxo.pilot.web.action.SearchProductAction" method="getProductsList">
			<result name = "input">/jsp/fail.jsp</result>
			<result name = "success">/jsp/input.jsp</result>
		</action>
		<action name="search" class="com.oxxo.pilot.web.action.SearchProductAction" method="searchProductPromotionsList">
			<result name = "input">/jsp/fail.jsp</result>
			<result name = "success">/jsp/input.jsp</result>
		</action>
		
		<action name="update" class="com.oxxo.pilot.web.action.SearchProductAction" method="updateProductPromotions">
			<result name = "input">/jsp/fail.jsp</result>
			<result name = "success">/jsp/input.jsp</result>
		</action>
	</package>
</struts>

<!-- END SNIPPET: xworkSample -->

POM.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>oxxo</groupId>
	<artifactId>pilot</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>

	<name>pilot</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.3.1.1</version>
		</dependency>
		<dependency>
			<groupId>com.jgeppert.struts2.jquery</groupId>
			<artifactId>struts2-jquery-plugin</artifactId>
			<version>3.2.0</version>
		</dependency>
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-junit-plugin</artifactId>
			<version>2.3.1.1</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>2.5</version>
			<type>jar</type>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.1</version>
			<scope>provided</scope>
		</dependency>
	</dependencies>
</project>

Thanks,
Shikha

[Joe Ess]

The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.

Can you show us the complete stack trace?