Tiles Error : java.lang.NullPointerException

Hello,

I am trying to implement tiles in my application. I have configured all files properly(as far as i am concerned, since i was learning it from tutorials on web) but when i run my application it gives me an java.lang.NullPointerException for Tiles. So can anyone please tell me whats wrong with my configuration.

I am getting the following error in console of eclipse

resin-port-8080-18 DEBUG freemarker.cache - Could not find template in cache, creating new one; id=["org/apache/struts2/dispatcher/error.ftl"["en_US",UTF-8,parsed] ]
 resin-port-8080-18 DEBUG freemarker.cache - Compiling FreeMarker template "org/apache/struts2/dispatcher/error.ftl"["en_US",UTF-8,parsed]  from "jar:file:/C:/Users/cyou/resin-pro-4.0.27/webapps/CCRP/WEB-INF/lib/struts2-core-2.3.4.jar!/org/apache/struts2/dispatcher/error.ftl"

resin-port-8080-18 DEBUG freemarker.beans - Key "location" was not found on instance of java.lang.NullPointerException. Introspection information for the class is: {getClass=public final native java.lang.Class java.lang.Object.getClass(), localizedMessage=java.beans.PropertyDescriptor[name=localizedMessage; propertyType=class java.lang.String; readMethod=public java.lang.String java.lang.Throwable.getLocalizedMessage()], cause=java.beans.PropertyDescriptor[name=cause; propertyType=class java.lang.Throwable; readMethod=public synchronized java.lang.Throwable java.lang.Throwable.getCause()], java.lang.Object@b61f43={public void java.lang.Throwable.setStackTrace(java.lang.StackTraceElement[])=[Ljava.lang.Class;@421168, public boolean java.lang.Object.equals(java.lang.Object)=[Ljava.lang.Class;@184d884, public java.lang.StackTraceElement[] java.lang.Throwable.getStackTrace()=[Ljava.lang.Class;@a2eeff, public final native java.lang.Class java.lang.Object.getClass()=[Ljava.lang.Class;@f8d1bb, public java.lang.String java.lang.Throwable.getLocalizedMessage()=[Ljava.lang.Class;@1917063, public synchronized java.lang.Throwable java.lang.Throwable.initCause(java.lang.Throwable)=[Ljava.lang.Class;@169b1ef, public java.lang.String java.lang.Throwable.toString()=[Ljava.lang.Class;@20e062, public native int java.lang.Object.hashCode()=[Ljava.lang.Class;@6b4e4e, public java.lang.String java.lang.Throwable.getMessage()=[Ljava.lang.Class;@e1ee61, public synchronized java.lang.Throwable java.lang.Throwable.getCause()=[Ljava.lang.Class;@e952f1, public final synchronized java.lang.Throwable[] java.lang.Throwable.getSuppressed()=[Ljava.lang.Class;@446e88, public synchronized java.lang.Throwable java.lang.Throwable.fillInStackTrace()=[Ljava.lang.Class;@b4d625, public final synchronized void java.lang.Throwable.addSuppressed(java.lang.Throwable)=[Ljava.lang.Class;@573c6d}, getSuppressed=public final synchronized java.lang.Throwable[] java.lang.Throwable.getSuppressed(), java.lang.Object@1d14e7c=freemarker.ext.beans.MethodMap@140456a, getCause=public synchronized java.lang.Throwable java.lang.Throwable.getCause(), getMessage=public java.lang.String java.lang.Throwable.getMessage(), equals=public boolean java.lang.Object.equals(java.lang.Object), hashCode=public native int java.lang.Object.hashCode(), class=java.beans.PropertyDescriptor[name=class; propertyType=class java.lang.Class; readMethod=public final native java.lang.Class java.lang.Object.getClass()], addSuppressed=public final synchronized void java.lang.Throwable.addSuppressed(java.lang.Throwable), fillInStackTrace=public synchronized java.lang.Throwable java.lang.Throwable.fillInStackTrace(), stackTrace=java.beans.PropertyDescriptor[name=stackTrace; propertyType=class [Ljava.lang.StackTraceElement;; readMethod=public java.lang.StackTraceElement[] java.lang.Throwable.getStackTrace()], message=java.beans.PropertyDescriptor[name=message; propertyType=class java.lang.String; readMethod=public java.lang.String java.lang.Throwable.getMessage()], suppressed=java.beans.PropertyDescriptor[name=suppressed; propertyType=class [Ljava.lang.Throwable;; readMethod=public final synchronized java.lang.Throwable[] java.lang.Throwable.getSuppressed()], getStackTrace=public java.lang.StackTraceElement[] java.lang.Throwable.getStackTrace(), setStackTrace=public void java.lang.Throwable.setStackTrace(java.lang.StackTraceElement[]), toString=public java.lang.String java.lang.Throwable.toString(), initCause=public synchronized java.lang.Throwable java.lang.Throwable.initCause(java.lang.Throwable), printStackTrace=freemarker.ext.beans.MethodMap@8d56b1, getLocalizedMessage=public java.lang.String java.lang.Throwable.getLocalizedMessage()}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee"  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd" id="WebApp_9" version="2.5">
  <display-name>CCRP</display-name>
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>2</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>2</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <session-config>
    <session-timeout>30</session-timeout>
  </session-config>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

<context-param>
  	<param-name>org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG</param-name>
  	<param-value>/WEB-INF/tiles-defs.xml</param-value>
  </context-param>
  <listener>
  	<listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class>
  </listener>
  
  <filter>
    <filter-name>Struts2</filter-name>
    <filter-class>
    		org.apache.struts2.dispatcher.FilterDispatcher
    	</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>Struts2</filter-name>
    <url-pattern>*</url-pattern>
  </filter-mapping>
  <jsp-config>
    <taglib>
      <taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
      <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
    </taglib>
    <taglib>
      <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
      <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
    </taglib>
    <taglib>
      <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
      <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
    </taglib>
    <taglib>
      <taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
      <taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
    </taglib>
    <taglib>
      <taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
      <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
    </taglib>
  </jsp-config>
</web-app>

tiles-defs.xml

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

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://jakarta.apache.org/struts/dtds/tiles-config_2_0.dtd">

<tiles-definitions>

struts.xml

Any Help will be highly appreciated!

Are you using container such as Tomcat 6.x or 7.x ? if yes you don't need to specify these

all you need to do is just put struts.jar and all other jar files in /WEB-INF/lib i don't know that is solution for your case but from your looking at your web.xml file i think of this so try it

Hello Yogesh Thank you for your reply but that didn't solve my problem. I am using resin 4.0. But yes your suggestion will help me eradicate unwanted code in my application.

I solved the error. Actually it was occurring due to old .tld file in my tils-defs.xml and baseLayout.jsp files.

I replace the previous one

<?xml version="1.0" encoding="UTF-8" ?>  
      
     <!DOCTYPE tiles-definitions PUBLIC  
           "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"  
           "http://jakarta.apache.org/struts/dtds/tiles-config_2_0.dtd">  
      
      
    <tiles-definitions>  
      
        <definition name="baseLayout" template="/baseLayout.jsp" >  
            <put name="title"  value="Cyber Cafe Promotion System" />  
            <put name="header" value="/header.jsp" />  
            <put name="menu"   value="/menu.jsp" />  
            <put name="body"   value="/Login.jsp" />  
            <put name="footer" value="/footer.jsp" />          
        </definition>  
        <definition name="friends" extends="baseLayout">  
            <put name="title" value="Friends" />  
            <put name="body" value="/jsp/friends.jsp" />  
        </definition>  
        <definition name="office" extends="baseLayout">  
            <put name="title" value="The Office" />  
            <put name="body" value="/jsp/office.jsp" />  
        </definition>  
        <definition name="forgot_password" extends="baseLayout">  
            <put name="title" value="Forgot Password" />  
            <put name="body" value="/Forgot_Password.jsp" />  
        </definition>  
        <definition name="test" extends="baseLayout">  
            <put name="title" value="Test" />  
            <put name = "body" value="/Test.jsp" />  
        </definition>  
        <definition name="register" extends="baseLayout" >  
            <put name="title" value="Cyber Cafe Program-Register" />  
            <put name = "body" value="/register.jsp" />  
        </definition>  
        <definition name="failure" extends="baseLayout">  
            <put name="title" value="Failure" />  
            <put name = "body" value="/Error.jsp" />  
        </definition>  
    </tiles-definitions>

with this new one

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

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">

You can easily see the difference between the older put tags versus newer put-attribute tags.

But the important thing to change is this URL <!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN" "http://jakarta.apache.org/struts/dtds/tiles-config_2_0.dtd">

with

this one <!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN" "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">.

Hope it helps some other facing the same problem.

Cheers